The 94th Annual Meeting of the Japanese Orthopaedic Association（ II ）

May 20-23, 2021 Tokyo Congress President: Hiroyuki Tsuchiya, M.D. Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University

4th Day May 23 Room 1

12：35 ～ 13：45 Luncheon seminar 36 Moderator T. Otsuka

4-1-LS36 R adical surgery for spine tumor and postoperative pain control Hideki Murakami, Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S568

4th Day May 23 Room 2

7：55 ～ 8：55 Instructional lecture 45 Moderator H. Miura

4-2-EL45 A ppropriate response in the event of an infectious disease Seishi Asari, Dept. of Health Science, Graduate School of Medicine, Osaka Univ.…S568

9：10 ～ 10：30 Symposium 45 Overlooked pediatric fractures Moderators A. Seki, T. Kinjo

4-2-S45-1 I nitial treatment for fractures in children Katsuaki Taira, Dept. of Orthop. Surg., Saitama Childrenʼs Medical Center…S569 4-2-S45-2 F racture in children: Peals & pitfalls Yoshitaka Eguchi, Div. of Orthop. Surg, National Center for Child Health and Development…S569 4-2-S45-3 T reatment of pediatric fractures: Conservative treatment vs. operative treatment Keisuke Nakagawa, Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S570 4-2-S45-4 T ips for avoiding common “traps” in pediatric fractures during the initial treatment Yasuhiro Oikawa, et al., Dept. of Orthop. Surg., Chiba Childrenʼs Hosp.…S570 4-2-S45-5 A pproach to missed pediatric fractures in a teaching hospital Masahide Ikema, et al., Dept. of Orthop. Surg., Okinawa Chubu Hosp.…S571

10：45 ～ 12：05 Symposium 46 Moderators A. Mogami, Y. Watanabe Fracture treatment for young orthopaedic surgeons

4-2-S46-1 E xternal fixation of extremities: Principles and applications Satoshi Takahata, Dept. of Orthop. Surg., Nishinomiya Watanabe Hosp.…S572 4-2-S46-2 I ndications and limitations of intramedullary nailing: Evolution of implants and surgical techniques Hisayoshi Inoue, Dept. of Orthop. Surg., Sendai Tokushukai Hosp.…S572 4-2-S46-3 I ndication and limitation of plate osteosynthesis in upper extremity fractures Makoto Kobayashi, Dept. of Orthop. Surg., Yokohama Rosai Hosp.…S573 4-2-S46-4 I ndication and limitation of plate fixation for fractures of the lower extremity Tomoyuki Noda, et al., Dept. of Musculoskeletal Traumatology, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S573 4-2-S46-5 R ole of external fixation in the treatment of fracture: Indication and limitation Kiyoto Kinugasa, et al., Dept. of Orthop. Surg., Chikamori Hosp.…S574

― 101 ― 12：35 ～ 13：45 Luncheon seminar 37 Moderator Y. Takagi

4-2-LS37-1 T he diagnostic efficacy of the shoulder through the super thin slice imaging of MRI visualized by deep learning technology Ryuzo Arai, Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S575 4-2-LS37-2 E ncouragement of knee ultrasound Junsuke Nakase, Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S575

14：00 ～ 15：00 Instructional lecture 46 Moderator M. Senda

4-2-EL46 H ow do orthopaedic surgeons cope with frailty ? Yasumoto Matsui, Center for Frailty and Locomotive Syndrome, National Center for Geriatrics and Gerontology…S576

15：15 ～ 16：15 Instructional lecture 47 Moderator H. Ozawa

4-2-EL47 M anagement of pediatric scoliosis Katsushi Takeshita, Dept. of Orthop., Jichi Medical Univ.…S576

4th Day May 23 Room 3

7：55 ～ 8：55 Instructional lecture 48 Moderator H. Takahashi

4-3-EL48 S afety-II: A synthetic approach to patient safety based on resilience engineering theory Kazue Nakajima, Dept. of Clinical Quality Management, Osaka Univ. Hosp.…S577

9：10 ～ 10：30 Symposium 47 Moderators A. Okawa, M. Ikeuchi Patient safety and quality management in Orthopaedics

4-3-S47-1 M edical safety precautions necessary for orthopaedic practice Susumu Nakajima, Dept. of Patient Safety, Saitama Medical Univ. Hosp.…S578 4-3-S47-2 S hall we make our quality indicator in orthopaedic surgery? Takashi Yamazaki, et al., Dept. of Orthop. Surg., Musashino Red Cross Hosp.…S578 4-3-S47-3 H ealth care in orthopaedic surgery and hospital function evaluation Ichiro Kobayashi, Hokusetsu General Hosp.…S579 4-3-S47-4 I npatient fall rate and its trend in orthopaedic wards in the university hospital Yutaka Morizaki, Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S579 4-3-S47-5 I nformed consent for orthopaedic surgery Yoshitomo Kajino, et al., Div. of Medical Safety, Kanazawa Univ. Hosp.…S580

10：45 ～ 12：05 Symposium 48 Moderators M. Kamata, M. Shirahama The role of orthopaedists during major disasters

4-3-S48-1 O rthopaedic practice in the Great East Japan earthquake Shuji Isefuku, Dept. of Orthop. Surg., South Miyagi Medical Center…S581 4-3-S48-2 T he role of orthopaedic surgeon after The 2016 Kumamoto earthquakes Naoki Okamura, et al., Dept. of Orthop. Surg., Kumamoto Red Cross Hosp.…S581 4-3-S48-3 T he purpose and significance of the establishment of the disaster medical team of the Japan Clinical Orthopaedic Association (JCOADiT) Hidenori Kawamura, Kawamura Orthop. Surg.…S582 4-3-S48-4 C urrent situation of the disaster response committee in the Japan Orthopaedic Association Taketo Kurozumi, Trauma and Reconstruction Center, Teikyo Univ. Hosp.…S582 4-3-S48-5 H ow should each orthopaedic doctor play a role in Tokyo Metropolitan earthquake ? Yasuhito Tajiri, Tokyo Metropolitan Hiroo Hosp.…S583

― 102 ― 12：35 ～ 13：45 Luncheon seminar 38 Moderator M. Matsumoto

4-3-LS38 E xpectations and prospects for filgotinib, a novel JAK inhibitor, in rheumatoid arthritis Tsutomu Takeuchi, Div. of Rheumatology, Dept. of Internal Medicine, Keio Univ.…S584

14：00 ～ 15：00 JOA Academic Encouragement Award Moderator N. Kawahara

4-3-AE-1 G RK5 inhibition attenuates cartilage degradation via decreased NF-kappa B signalling Takuya Sueishi, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S585 4-3-AE-2 E xcessive mechanical loading promotes osteoarthritis through the gremlin-1-NF-κB pathway Song Ho Chang, Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S585 4-3-AE-3 E fficacy and safety of trabectedin for patients with advanced soft-tissue sarcoma in Japan: A Japanese Musculoskeletal Oncology Group study Hiroshi Kobayashi, Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S586 4-3-AE-4 A ctivation of TLR4 signaling inhibits progression of osteosarcoma by stimulating CD8-positive cytotoxic lymphocytes Kenichiro Yahiro, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S586

15：15 ～ 16：15 Instructional lecture 49 Moderator K. Sugamoto

4-3-EL49 D iagnosis and treatment for difficulties of shoulder elevation Shinji Imai, Dept. of Orthop. Surg., Shiga Univ. of Medical Science…S587

4th Day May 23 Room 4

7：55 ～ 8：55 Instructional lecture 50 Moderator H. Yamada

4-4-EL50 T reatment and diagnosis of sports related low back pain Koichi Sairyo, Dept. of Orthop., Tokushima Univ. Graduate School…S587

9：10 ～ 10：10 Instructional lecture 51 Moderator S. Konno

4-4-EL51 “ Pitfalls” of expert witness: Notes on becoming an expert witness You Munakata, Sekiya Munakata Law Office…S588

10：45 ～ 11：45 Instructional lecture 52 Moderator M. Takaso

4-4-EL52 A pproach to ethical dilemma in clinical settings Yoshiyuki Takimoto, Dept. of Biomedical Ethics, Graduate School of Medicine, The Univ. of Tokyo…S588

12：35 ～ 13：45 Luncheon seminar 39 Moderator N. Endo

4-4-LS39 B one attack prevention: Doʼs and Donʼts Hiroshi Hagino, Rehabilitation Div., Tottori Univ. Hosp.…S589

14：00 ～ 15：00 Instructional lecture 53 Moderator K. Yamamoto

4-4-EL53 K ampo medicine for orthopaedics: From clinical application to its evidence Keiko Ogawa, Dept. of Japanese-Traditional (Kampo) Medicine, Kanazawa Univ. Hosp.…S589

15：15 ～ 16：15 Instructional lecture 54 Moderator K. Nakanishi

4-4-EL54 C hronic low back pain related to muscle volume and osteoporotic vertebral fracture Seiji Ohtori, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S590

― 103 ― 4th Day May 23 Room 5

7：55 ～ 8：55 Instructional lecture 55 Moderator T. Nomura

4-5-EL55 A n essence to improve the quality of rehabilitation treatment: How to build a suitable team with therapists Tetsutaro Yahata, Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S590

9：10 ～ 10：30 Symposium 49 Moderators A. Harada, N. Matsuzaki Various issues in traffic accident-related treatment

4-5-S49-1 C areful point of medical certificate in traffic accident medical treatment Shigeru Harada, Dept. of Orthop. Surg., Tsukuba Gakuen Hosp.…S591 4-5-S49-2 H andling of various insurance in the traffic accident medical treatment Sumio Kota, Tokyo Medical Association…S591 4-5-S49-3 T raffic accident medical treatment: Problems with quasi-medical practice Hitoshi Yamashita, Yamashita Orthop. Clinic…S592 4-5-S49-4 T raffic accident medical treatment as compensation for damages Mamoru Hanari, Hibiki Lo.…S592 4-5-S49-5 J apan Medical Association's efforts on various problems in traffic accident medical care Kimiyuki Nagashima, Japan Medical Association…S593

10：45 ～ 12：05 Symposium 50 Moderators M. Moriyama, H. Yamashita Locomotor apparatus health exams in schools: Achievements and future issues

4-5-S50-1 M edical examination locomotive organs in school-age children by JCOA Teruaki Shibata, Kitamato Orthop. Clinic…S594 4-5-S50-2 M usculoskeletal screening at school in Gifu prefecture: Current status and future issues, cooperation with baseball elbow screening in junior players Hiroshi Kawasaki, Kawasaki Orthop. Clinic…S594 4-5-S50-3 B one bruise of the thoracic spine caused by mild physical activity in children is an important issue Kenji Endo, et al., Endo Orthop. Clinic…S595 4-5-S50-4 P reparation, current status, and problems for musculoskeletal examinations in Kumamoto City Yasunari Oniki, Reha Center Kumamoto Kaiseikai Hosp.…S595 4-5-S50-5 T he school medical examination for locomotive organ: Achievements and future tasks Sadao Arai, Arai Orthop. Clinic…S596

12：35 ～ 13：45 Luncheon seminar 40 Moderator K. Nakamura

4-5-LS40 T reatment of osteoarthritis using adipose-derived stem cells Taku Saito, Orthop. Surg., Graduate School of Medicine, The Univ. of Tokyo…S597

14：00 ～ 15：00 Instructional lecture 56 Moderator K. Kitaoka

4-5-EL56 D iagnosis and treatment of knee sports injuries for the general orthopaedic surgeons Masataka Deie, Dept. of Orthop. Surg., Aichi Medical Univ., School of Medicine…S597

15：15 ～ 16：15 Free papers Knee 5: Meniscus 2 Moderators Y. Yamamoto, T. Furumatsu

4-5-1 R elationship between medial meniscus posterior root tear and posterior tibial slope on MRI Takahisa Abe, et al., Dept. of Orthop. Surg., Tohoku Univ. Graduate School of Medicine…S598 4-5-2 E valuation for MMPRT knee during knee flexion and loading using ultrasonography: A comparison with non MMPRT knee and healthy knee Kengo Shimozaki, et al., Dept. of Orthop. Surg., Saiseikai Kanazawa Hosp.…S598

― 104 ― 4-5-3 M edial meniscus extrusion accompanied by posterior root tear depends on knee position Haruhiko Nakamura, et al., Dept. of Orthop. Surg., Saitama Medical Center, Saitama Medical Univ.…S599 4-5-4 R eview of the literature: The preventive effect of knee osteoarthritis in medial meniscus root tear by pull-out repair Mahiro Ohno, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S599 4-5-5 M RI findings over time of repair for the medial meniscus posterior root tear and open wedge high tibial osteotomy Naoki Sugita, et al., Dept. of Orthop. Surg., Saitama Medical Univ.…S600 4-5-6 I mprovements of tibial tunnel placements in medial meniscus posterior root pullout repairs Yusuke Kamatsuki, et al., Dept. of Orthop. Surg., Kochi Health Sciences Center…S600

4th Day May 23 Room 6

7：55 ～ 8：55 Instructional lecture 57 Moderator K. Takahashi

4-6-EL57 M anagement of patients with rheumatoid arthritis using biologics and JAK inhibitors in the era of super aging society Mitsuhiro Kawano, Dept. of Rheum., Kanazawa Univ. Hosp.…S601

9：10 ～ 10：30 Symposium 51 Moderators E. Horii, K. Hayakawa Women orthopaedists and utilization of ICT

4-6-S51-1 T he current status related to ICT utilization in orthopaedics Yumi Niizeki, Dept. of Orthop. Surg., Soka Municipal Hosp.…S602 4-6-S51-2 O utlook for IT and AI: What is available. what would be capable Hiroyuki Nobutomo, National Strategy Office for IT, Cabinet Secretariat…S602 4-6-S51-3 C urrent status and outlook of medical ICT Yumi Inoo, Medley, Inc.…S603 4-6-S51-4 C urrent status and possibility of ITC medical cooperation in Nagasaki Takashi Fujii, Medical Association, Nagasaki Prefecture…S603 4-6-S51-5 A pproach for community medicine and effective use of ICT Katsushi Takeshita, Dept. of Orthop., Jichi Medical Univ.…S604

10：45 ～ 12：05 Symposium 52 Moderators T. Karita, T. Nishii Fostering young orthopaedists today

4-6-S52-1 T raining and nurturing of young orthopaedic doctors: Trauma of spine and pelvis Yasuo Ito, Dept. of Orthop. Surg., Red Cross Kobe Hosp.…S605 4-6-S52-2 C omparison with postgraduate training system abroad Hirotaka Onishi, Dept. of Medical Education for International Cooporation, The Univ. of Tokyo…S605 4-6-S52-3 E ducation of orthopaedic trauma management: From basic to advanced Koichi Inokuchi, Trauma Center, Saitama Medical Center, Saitama Medical Univ.…S606 4-6-S52-4 E ssentials in rehabilitation medicine in for young orthopaedic surgeons Fumihiro Tajima, et al., Dept. of Rehabilitation Medicine, Wakayama Medical Univ.…S606 4-6-S52-5 G uidance and training of young orthopaedic surgeon: The stance of occupational health Makoto Kawasaki, et al., Dept. of Orthop. Surg., School of Medicine, Univ. of Occupational and Environmental Health…S607

12：35 ～ 13：45 Luncheon seminar 41 Moderator M. Doita

4-6-LS41 E vidence based management of osteoporosis to extend healthy life expectancy: Exercise and pharmacotherapy Naohisa Miyakoshi, Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S608

― 105 ― 14：00 ～ 15：00 Free papers Knee 6: OA 1 Moderators Y. Niki, T. Matsushita

4-6-1 C omparative clinical outcomes after intra-articular injection with adipose-derived cultured stem cells or noncultured stromal vascular fraction for the knee osteoarthritis Naomasa Yokota, et al., Tokyo Knee Osteoarthritis Clinic Shinjuku…S609 4-6-2 2 -year comparative clinical outcomes after intra-articular injection with adipose derived cultured stem cells or noncultured stromal vascular fraction Naomasa Yokota, et al., Tokyo Knee Osteoarthritis Clinic Shinjuku…S609 4-6-3 E valuation of articular cartilage using MRI three-dimensional image analysis workstation in biotherapy for knee osteoarthritis Tadahiko Ohtsuru, et al., Omiya Knee OA Clinic…S610 4-6-4 B iomarker changes before and after PRP therapy for osteoarthritis of the knee Sayuri Uchino, et al., Dept. of Orthop. Surg., Juntendo Univ. Hosp.…S610 4-6-5 P henotype classification of osteoarthritis of the knee by pain mechanism Mitsuhiko Kubo, et al., Dept. of Orthop. Surg., Shiga Univ. of Medical Science…S611 4-6-6 T he influence of central sensitization in patients with knee osteoarthritis from Iwaki cohort study Eiji Sasaki, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S611

15：15 ～ 16：15 Free papers Knee 7: OA 2 Moderators G. Tajima, H. Hiraiwa

4-6-7 T he influence of varus deformity on the position of femur relative to tibia throughout range of motion in osteoarthritis knees Tomofumi Kinoshita, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S612 4-6-8 C hanges in relative contributions of each moment component at the knee according to severity of osteoarthritis Yuki Suzuki, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S612 4-6-9 E ffect of lateral wedge insole on medial meniscus extrusion and knee pain during walking in knee osteoarthritis Yosuke Ishii, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S613 4-6-10 K inematics of varus thrust in patients with medial knee osteoarthritis: Quantified by three dimensional analysis Koji Iwasaki, et al., Dept. of Functional Reconstruction for the Knee Joint, Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S613 4-6-11 T he inclination of the medial compartment of the proximal tibia causes varus thrust even in early knee osteoarthritis Toshiro Shima, et al., Dept. of Orthop. Surg., Nagaoka Red Cross Hosp.…S614 4-6-12 E valuations of postoperative alignment of hip and ankle joint and three-dimensional gait analysis after tibial osteotomy Tetsuro Masuda, et al., Dept. of Orthop. Surg., Kumamoto Univ.…S614

4th Day May 23 Room 7

7：55 ～ 8：55 Instructional lecture 58 Moderator T. Tachibana

4-7-EL58 E volutionary specialization of the human body: From the perspectives of comparative anatomy and animal breeding Hideki Endo, The Univ. Museum, The Univ. of Tokyo…S615

9：10 ～ 10：10 Instructional lecture 59 Moderator T. Saito

4-7-EL59 T reatment strategy for cervical disorders: From conservative to intractable therapies Ken Ishii, Dept. of Orthop. Surg., International Univ. of Health and Welfare…S615

― 106 ― 10：45 ～ 11：45 Instructional lecture 60 Moderator M. Mawatari

4-7-EL60 P eriprosthetic joint infection: Update on recent developments in diagnosis and treatment Yutaka Inaba, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S616

12：35 ～ 13：45 Luncheon seminar 42 Moderator S. Momohara

4-7-LS42 T he role of glucocorticoids and csDMARDs in the treatment of rheumatoid arthritis: Aiming to further improve outcomes Ryota Hara, Dept. of Orthop. Surg., Nara Medical Univ.…S616

14：00 ～ 15：00 Free papers RA 4: Pharmacotherapy Moderators T. Kojima, Y. Nagaya

4-7-1 C hanges in quality of life of rheumatoid patients according to the disease duration Masaaki Usui, et al., Dept. of Orthop. Surg., Okayama City Hosp.…S617 4-7-2 A large observational cohort study of rheumatoid arthritis in Akita (AORA): Real world data in rural area of Japan Takeshi Kashiwagura, et al., Dept. of Orthop. Surg., Akita City Hosp.…S617 4-7-3 S ufficient conditions for sustained functional remission in rheumatoid arthritis patients Kensuke Koyama, Dept. of Orthop. Surg., Graduate School of Medical Science, Univ. of Yamanashi…S618 4-7-4 A retrospective analysis of the relationship between anti-cyclic citrullinated peptide antibody and the effectiveness of abatacept in rheumatoid arthritis patients Nobunori Takahashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S618 4-7-5 C linical effectiveness and safety of baricitinib in rheumatoid arthritis patients in routine clinical practice: Results from a Japanese multicenter registry Nobunori Takahashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S619 4-7-6 U ltrasonographic evaluation of baricitinib and TNF antagonist therapy in patients with rheumatoid arthritis Yasuhide Kanayama, Dept. of Orthop. Surg., Toyota Kosei Hosp.…S619

15：15 ～ 16：15 Free papers RA 5: General Moderators J. Chiba, K. Nishimura

4-7-7 C haracteristics of very elderly rheumatoid arthritis forefoot deformity who performed toe plasty Kota Shimomura, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S620 4-7-8 E valuation of callus and flexor tendon dislocation of forefoot deformity in rheumatoid arthritis Takeshi Kashiwagura, et al., Dept. of Orthop. Surg., Akita City Hosp.…S620 4-7-9 A study on the relationship between CRP at diagnosis of rheumatoid arthritis and the number of affected joints, etc. Tsuyoshi Nishiume, Dept. of Orthop. Surg., Okazaki City Hosp.…S621 4-7-10 T he association between residual symptoms and cervical spine lesions in rheumatoid arthritis Takeshi Kashiwagura, et al., Dept. of Orthop. Surg., Akita City Hosp.…S621 4-7-11 T he influences of diabetes mellitus for rheumatoid arthritis patients Kenya Terabe, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S622 4-7-12 R heumatoid arthritis itself is not a risk factor for renal function deterioration Shoichi Murakami, et al., Shirahama Hamayu Hosp.…S622

― 107 ― 4th Day May 23 Room 8

7：55 ～ 8：55 Instructional lecture 61 Moderator H. Akiyama

4-8-EL61 A strategy for osteoarthritis of the hip: A 100-year of life to walk with smile to the end Ayumi Kaneuji, et al., Dept. of Orthop. Surg., Kanazawa Medical Univ.…S623

9：10 ～ 10：10 Instructional lecture 62 Moderator K. Sato

4-8-EL62 S urgical technique, selection of implant, and management of complication for primary and revision total elbow arthroplasty Keiichiro Nishida, Science of Functional Recovery and Reconstruction, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S623

10：45 ～ 11：45 Instructional lecture 63 Moderator H. Haro

4-8-EL63 U tility of locomotive syndrome from the point of middle aged and elderly people in a health checkup Shiro Imagama, Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S624

12：35 ～ 13：45 Luncheon seminar 43 Moderator Y. Uchio

4-8-LS43 A novel conservative treatment strategy for the treatment of knee osteoarthritis Yoshihiro Nishida, Dept. of Rehabilitation, Nagoya Univ. Hosp.…S624

14：00 ～ 15：00 Free papers THA 5: Outcome Moderators T. Shishido, S. Maniwa

4-8-1 E arly postoperative clinical outcomes of robotic arm-assisted total hip arthroplasty Nao Shibanuma, et al., Dept. of Orthop. Surg., Kobe Kaisei Hosp.…S625 4-8-2 C orrelation between changes in global femoral offset after total hip arthroplasty and clinical function Eiji Cho, et al., Dept. of Orthop. Surg., Nihon Univ.…S625 4-8-3 L ong-term results of C-Stem in total hip arthroplasty with line-to-line implantation: Minimum 10-years follow up Shuichi Miyamoto, et al., Dept. of Orthop. Surg., Matsudo City General Hosp.…S626 4-8-4 R elationship with three-dimensional global femoral offset difference and modified-Harris hip in unilateral THA cases Yuki Hirano, Dept. of Orthop. Surg., Tachikawa General Hosp.…S626 4-8-5 I dentification of factors associated with early improvement of gait of patients with total hip arthroplasty Yoshihiro Ritsuno, et al., Dept. of Orthop. Surg., Fujita Health Univ.…S627 4-8-6 W hen does the walking speed improve after total hip arthroplasty?: Investigation of the influence on the patientsʼ age Hiroyuki Izumida, et al., Keiyu Joint Reconstruction Center, Edogawa Hosp.…S627

15：15 ～ 16：15 Free papers THA 6: General Moderators M. Morita, K. Goto

4-8-7 W hen is appropriate timing for total hip arthroplasty?: The study from the aspect of postoperative muscle recovery Daigo Morita, et al., Dept. of Orthop. Surg., Hamamatsu Medical Center…S628 4-8-8 A ssociation of preoperative muscle atrophy and fatty degeneration with early postoperative physical function in THA Makoto Iwasa, Dept. of Orthop. Medical Engineering, Graduate School of Medicine, Osaka Univ.…S628 4-8-9 F inite element analysis for accurate positioning of femoral osteotomy in total hip arthroplasty with subtrochanteric shortening Daisuke Takahashi, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S629 4-8-10 E ffects of the femoral head diameter on the range of motion in total hip arthroplasty Ryo Mitsutake, et al., Dept. of Orthop. Surg., Asahikawa Medical Univ.…S629

― 108 ― 4-8-11 Q uantitative analysis of hammering sound during cementless stem insertion focusing on femoral morphology and stem medullary cavity occupancy Xu Zhuang, et al., Dept. of Orthop., Juntendo Univ. …S630 4-8-12 I s there a left-right difference in the number of operations for total hip arthroplasty? Hideaki Nagashima, et al., Dept. of Orthop. Surg., Shiga General Hosp.…S630

4th Day May 23 Room 9

7：55 ～ 8：55 Instructional lecture 64 Moderator Y. Ishibashi

4-9-EL64 M eniscal injury, diagnosis and treatment Ryosuke Kuroda, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S631

9：10 ～ 10：30 Free papers Moderators A. Kanda, T. Mae Trauma 8: Proximal femoral fracture 1

4-9-1 A study of treatment outcomes in femoral trochanteric fractures before and after the establishment of a trauma reconstruction center Yumetaka Shinden, Trauma and Reconstruction Surg. Center, Aizu Chuo Hosp.…S632 4-9-2 H ypoalbuminemia for hip fractures is associated with decreased nutritional indices, leading to increased complications and prolonged hospital stay Takuji Matsumoto, Dept. of Orthop. Surg., Nokami Kosei General Hosp.…S632 4-9-3 A nnual administration of zoledronic acid during hospitalization after hip fracture surgery is the best method for secondary fracture prevention? Masafumi Kashii, et al., Dept. of Orthop. Surg., Toyonaka Municipal Hosp.…S633 4-9-4 T he critical path method including osteoporosis treatment for hip fracture should suppress the incidence of contralateral hip fracture Kaoru Yamazaki, et al., Dept. of Orthop. Surg., Iwata City Hosp.…S633 4-9-5 N on weight bearing after fixation of undisplaced femoral neck fractures didnʼt affect the clinical outcome Kanta Hasegawa, et al., Dept. of Orthop. Surg., Nagoya Daini Red Cross Hosp.…S634 4-9-6 A utomated classification of hip fractures using deep convolutional neural networks with orthopaedic surgeon-level accuracy Yutoku Yamada, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S634 4-9-7 C T imaging computer-aided diagnosis for hip fractures showed excellent accuracy by totally different point of view from that of human Yuichi Imoto, et al., Dept. of Orthop. Surg., Teikyo Univ.…S635 4-9-8 M ulticenter collaborative study of a machine learning model for predicting intraoperative implant size for hip fractures using only patient information Yoichi Sato, et al., Dept. of Orthop. Surg., JCHO Tokyo Shinjuku Medical Center…S635

10：45 ～ 12：05 Free papers Moderators M. Ito, T. Nakajima Trauma 9: Proximal femoral fracture 2

4-9-9 D ementia and heart disease are risk factors for the second hip fracture: Age, sex and fracture type matched case-control study Tomoki Fuita, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S636 4-9-10 M ales and malignant tumors are risk factors for death after proximal femoral fractures Shuhei Ugaji, et al., Dept. of Orthop. Surg., Fukui Pref. Hosp.…S636 4-9-11 U sefulness of GNRI as an independent predictive indicator in hospital mortality for hip fracture patient Hiroto Funahashi, et al., Dept. of Orthop. Surg., Hamamatsu Medical Center…S637 4-9-12 I ncidence of delirium in proximal femoral fractures and the efficacy of ramelteon Fumihito Kasama, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S637

― 109 ― 4-9-13 F or the better outcome for hip fracture patients: The first orthogeriatric co-management in Japan Takahiro Waki, et al., Dept. of Orthop. Surg., Akashi Medical Center…S638 4-9-14 R adiation exposure to the medical staff during internal fixation of proximal femur fractures: A cadaveric study Michihiro Takai, et al., Dept. of Orthop. Surg., Tokushima Prefectural Central Hosp.…S638 4-9-15 E xamination of unfractionated heparin dose and commencing time during preoperative waiting period for proximal femoral fracture Yusuke Yamamoto, et al., Dept. of Orthop. and Rehabilitation Medicine, Univ. of Fukui…S639 4-9-16 T he effect of anticoagulant and antiplatelet agents on blood loss in hip fracture surgery Takao Ohmori, Dept. of Orthop. Surg., Red Cross Kobe Hosp.…S639

14：00 ～ 15：00 Free papers Moderators Y. Kokubo, N. Imai Trauma 10: Proximal femoral fracture 3

4-9-17 E valuation of anteromedial cortex in femoral trochanteric fractures: Which of intraoperative and postoperative lateral views of radiograph can be accurately evaluated Tatsuro Imai, et al., Dept. of Orthop. Surg., Kurobe City Hosp.…S640 4-9-18 C omparison of clinical outcomes after intramedullary nailing for trochanteric fracture between different distal screw fixations: Transverse vs. oblique type Hirokazu Noritake, et al., Dept. of Orthop. Surg., Japanese Red Cross Nagoya Daini Hosp.…S640 4-9-19 O blique coronal shear fracture is a very unstable variant of trochanteric fractures: A matched cohort study Takahiro Inui, et al., Dept. of Orthop. Surg., Teikyo Univ.…S641 4-9-20 I ntra-medullary swing motion of short femoral nail for pertrochanteric fractures Shunsuke Takahara, et al., Dept. of Orthop. Surg., Hyogo Pref. Kakogawa Medical Center…S641 4-9-21 F unctional and radiological results in the treatment of type II (reverse oblique type) proximal femoral fractures Yusaku Nakayama, et al., Dept. of Orthop. Surg., Tokushima Red Cross Hosp.…S642 4-9-22 P redictor for late segmental collapse in undisplaced femoral neck fractures Takashi Iwakura, et al., Dept. of Orthop. Surg., Sanda City Hosp.…S642

15：15 ～ 16：15 Free papers Trauma 11: Femur Moderators H. Nonomiya, T. Baba

4-9-23 R elationship between stem shape and fracture type in periprosthetic femoral fracture Hiroaki Murakami, et al., Dept. of Orthop. Surg., Asa Citizens Hosp.…S643 4-9-24 C omparison of postoperative results for Vancouver classification type B2 between osteosynthesis and revision arthroplasty after hip arthroplasty Takashi Imagama, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S643 4-9-25 E lucidation of pathogenesis of periprosthetic atypical femoral fracture associated with TKA: Multifactorial analysis by histology and biomechanics Jun Hashimoto, et al., Dept. of Orthop. and Spinal Surg., Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental Univ.…S644 4-9-26 M ulticenter study on atypical femoral fractures in patients with bone metastases using bone modifying agents Tomoaki Fukui, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S644 4-9-27 E valuation of instability after intramedullary nailing for femoral shaft fracture using FEA: Toward a decision of operative method for pseudoarthrosis Hideyuki Mimata, et al., Dept. of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu Univ.…S645 4-9-28 T he investigation about regularity and high-risk zone of profunda femoris artery Takehiro Kaneoka, et al., Dept. of Orthop. Surg., Tokuyama Hosp.…S645

― 110 ― 4th Day May 23 Room 10

7：55 ～ 8：55 Instructional lecture 65 Moderator S. Omokawa

4-10-EL65 T reatment of elbow and forearm disorders based on AI and biomechanical research Tsuyoshi Murase, Dept. of Orthop. Surg., Graduate School of Medicine, Osaka Univ.…S646

9：10 ～ 10：30 Free papers Knee 8: OA 3 Moderators R. Gejo, T. Matsumoto

4-10-1 C ross-sectional analysis of DNA methylation in knee osteoarthritis: Yakumo study Daisaku Kato, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S647 4-10-2 C arotenoid serum levels in relation to the development of knee osteoarthritis among community- dwelling people in Japan: Yakumo study Genta Takemoto, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S647 4-10-3 I nvestigation of factors related to subjective symptoms of knee osteoarthritis: Shimane CoHRE study Hiroshi Takuwa, et al., Dept. of Orthop., Shimane Univ.…S648 4-10-4 T he relationship between tibial plateau inclination and bone marrow lesion detected on MRI for the early knee osteoarthritis Kyota Ishibashi, Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S648 4-10-5 T he examination for progression and predictor of medial meniscal extrusion in a Japanese general population Seiya Ota, Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S649 4-10-6 M edial meniscus extrusion is more strongly associated with tibial osteophyte width than the femur in osteoarthritis of the knee Yoshifumi Negishi, et al., Dept. of Orthop., Juntendo Univ. …S649 4-10-7 T he association between ultrasound findings of the knee and clinical symptoms in aged subjects with KL grade ≤ 1 Motoo Saito, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S650 4-10-8 M RI features associated with weight or non-weight bearing pain in knee osteoarthritis, data from the osteoarthritis initiative Kazuki Ozaki, et al., Dept. of Orthop. Surg., Kochi Medical School, Kochi Univ.…S650

10：45 ～ 12：05 Free papers Moderators M. Hasegawa, K. Urabe TKA & UKA 3: Alignment & kinematics

4-10-9 T he effect of soft tissue balance and limb alignment to kinematics in kinematically aligned TKA using cruciate retaining implants Mitsuhiro Nakamura, Dept. of Orthop. Surg., Hiroshima Prefectural Hosp.…S651 4-10-10 C hanges in ankle and hindfoot alignment before and after total knee arthroplasty: An analysis using hip-calcaneus line Naoya Kikuchi, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S651 4-10-11 S tatic mediolateral tilt of the joint line after total knee arthroplasty doesn't reflect dynamic tilt during a stair ascent activity Kazuma Yabu, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S652 4-10-12 B iomechanical analysis of ACL function in bi-cruciate ligament retaining TKA Journey 2 XR Shogo Nabeki, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S652 4-10-13 T he rotational axis of tibial component in unicompartmental knee arthroplasty Yosuke Kuroda, et al., Dept. of Orthop. Surg., Nihon Univ. Hosp.…S653 4-10-14 R elationship between lower limb alignment changes and hindfoot alignment changes in total knee arthroplasty for varus knee osteoarthritis Shota Morimoto, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S653

― 111 ― 4-10-15 V ariety of patella tendon trend on OA knee, and which is how influence on the rotational alignment of TKA Taro Uehara, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S654 4-10-16 E ffect of preoperative medial proximal tibial angle on medial-lateral ligament imbalance in flexion after mechanically aligned total knee arthroplasty Shinichi Kuriyama, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S654

12：35 ～ 13：45 Luncheon seminar 44 Moderator N. Fujita

4-10-LS44-1 D iagnosis and treatment of spinal muscular atrophy: From a pediatricianʼs point of view Yu Abe, Dept. of Pediatrics, Shonai Hosp.…S655 4-10-LS44-2 M anagement of scoliosis in spinal muscular atrophy (SMA): With a focus on scoliosis surgery Masashi Takaso, Dept. of Orthop. Surg., Kitasato Univ.…S655

14：00 ～ 15：00 Free papers Moderators K. Naito, H. Okamoto Trauma 12: Distal radius fracture 1

4-10-17 T he rate of secondary fracture after distal radius fracture of postmenopausal women Yuya Hashino, et al., Dept. of Orthop. Surg., Tobata Kyoritsu Hosp.…S656 4-10-18 C haracteristics of sagittal spine alignment in female patients with distal radius fractures due to fall Ayaka Kaneko, et al., Dept. of Orthop., Juntendo Univ. …S656 4-10-19 D aily activity in the patients with radius distal fracture and humeral fracture Kotaro Sato, et al., Dept. of Orthop. Surg., Iwate Medical Univ. …S657 4-10-20 E valuation of re-displacement factor for distal radial fracture in conservative treatment So Kubota, Kubota Orthop. Clinic…S657 4-10-21 E valuation of fixation after plating of distal radius fractures: A validation study Takahiro Yamazaki, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S658 4-10-22 E fficacy of intraoperative computed tomographic navigation during volar locking plate fixation for intra-articular distal radius fractures Akira Kawabata, et al., Dept. of Orthop. Surg., Yodogawa Christian Hosp.…S658

15：15 ～ 16：15 Free papers Moderators T. Arai, H. Satake Trauma 13: Distal radius fracture 2

4-10-23 L isk factor of subluxation after volar plating of distal radius fracture with volar lunate facet flagment Hitoshi Hirase, et al., Orthop. Trauma Center, Hyogo Prefectural Nishinomiya Hosp.…S659 4-10-24 L oss of correction in distal radius fracture after locking plate fixation Takayuki Ishii, Dept. of Orthop. Surg., Tokai Univ. Hachioji Hosp.…S659 4-10-25 C lassification according to a positioning of a distal radius volar locking plate does not associate to post-surgical flexor tendon complications Kazuo Hayakawa, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S660 ® 4-10-26 E valuation of the site of the distal end and the distal screws of HYBRIX-D plate Yoshio Kaji, et al., Dept. of Rehabilitation, Kagawa Univ.…S660 ® 4-10-27 A nalysis of Acu-Loc2 plate position for the distal radius fracture Yoshiaki Tomizuka, et al., Dept. of Orthop. Surg., Nihon Univ.…S661 ® 4-10-28 C linical results of surgical treatment with APTUS babyfoot for distal radius fractures Kenji Serigano, et al., Dept. of Orthop. Surg., Shonan Central Hosp.…S661

― 112 ― 4th Day May 23 Room 11

7：55 ～ 8：55 Instructional lecture 66 Moderator N. Miyakoshi

4-11-EL66 E ssence of diagnosis of secondary osteoporosis Yasuhiro Takeuchi, Endocrine Center, Toranomon Hosp.…S662

9：10 ～ 10：10 Instructional lecture 67 Moderator Y. Kadono

4-11-EL67 C hanges in surgical treatment for rheumatoid arthritis with advances in drug therapy Sakae Tanaka, Orthop. Surg., Graduate School of Medicine, The Univ. of Tokyo…S662

10：45 ～ 11：45 Instructional lecture 68 Moderator Y. Suda

4-11-EL68 D iagnosis and treatment of adult acquired flatfoot deformity: Limitations of conservative treatment and timing of surgery Hisateru Niki, Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S663

12：35 ～ 13：45 Luncheon seminar 45 Moderator S. Komiya

4-11-LS45 O steoporosis treatment by anabolic agents: Role of biosimilar medicines Sakae Tanaka, Orthop. Surg., Graduate School of Medicine, The Univ. of Tokyo…S663

14：00 ～ 15：00 Free papers Moderators T. Tamada, H. Ishibashi Osteoporosis 4: Medication 2

4-11-1 A ssociation of serum 25-hydroxylated vitamin D with fragility fractures in patients with vitamin D deficiency Kohei Shimoda, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S664 4-11-2 E ldecalcitol should not be used without clinical examination Masato Uematsu, et al., Dept. of Orthop. Surg., Osaka City General Hosp.…S664 4-11-3 A nalysis of denosumab-induced hypocalcemia in patients with bone metastasis Koki Tsuchiya, et al., Dept. of Orthop. Surg., Showa Univ.…S665 4-11-4 E xamination of the necessity of zinc in osteoporosis treatment Hotaka Ishizu, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S665 4-11-5 E valuation of the nature and etiologies of risk factors for diaphyseal atypical femoral fracture Hiroyuki Tsuchie, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S666 4-11-6 D rug therapy for osteoporosis: Over 10 years follow-up Hajime Murai, et al., Dept. of Orthop. Surg., Akita Kousei Medical Center…S666

15：15 ～ 16：15 Free papers Moderators Y. Sakamoto, N. Yamamoto Osteoporosis 5: General

4-11-7 F actors associated with low back pain in patients with osteoporosis Masayuki Miyagi, et al., Dept. of Orthop. Surg., Kitasato Univ.…S667 4-11-8 M edical device development for osteosarcopenia: Using LED technology Yoshihiro Nishida, Dept. of Rehabilitation, Nagoya Univ. Hosp.…S667 4-11-9 R isk factors of existing vertebral fractures in preoperative examinations regarding lifestyle related disease among patients with spinal degenerative disease Yudai Yano, et al., Dept. of Orthop. Surg., Nara City Hosp.…S668 4-11-10 C arpal tunnel syndrome as a potential risk for cardiac amyloidosis Hiroki Kozuki, et al., Dept. of Orthop. Surg., Kochi Medical School, Kochi Univ.…S668

― 113 ― 4-11-11 P redictive factors and clinical effects of diabetic hand Michiro Yamamoto, et al., Dept. of Personalized Medical Technology, Nagoya Univ. Graduate School of Medicine…S669 4-11-12 E valuation of factors affecting the recurrence of atypical femoral fracture after bone union Hiroyuki Tsuchie, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S669

4th Day May 23 Room 12

7：55 ～ 8：55 Instructional lecture 69 Moderator T. Kunisada

4-12-EL69 V aluable characteristics of five major cancers for orthopaedic surgeons Hiroyuki Kawashima, Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S670

9：10 ～ 10：10 Instructional lecture 70 Moderator J. Nishida

4-12-EL70 P oints to be noted in surgical treatment for bone metastases Akihiko Matsumine, Dept. of Orthop., Univ. of Fukui Hosp.…S670

10：45 ～ 11：45 Instructional lecture 71 Moderator T. Morii

4-12-EL71 C omprehensive management for locomotive syndrome in cancer patients Tatsuya Takagi, Dept. of Orthop., Juntendo Univ. …S671

12：35 ～ 13：45 Luncheon seminar 46 Moderator T. Kojima

4-12-LS46-1 P erioperative management of disease-modifying anti-rheumatic drugs: Overview and up-date of guidelines and recommendations Keiichiro Nishida, Dept. of Orthop. Surg., Okayama Univ.…S672 4-12-LS46-2 S urgical treatment of rheumatoid arthritis (wrist) Asami Abe, Dept. of Rheumatology, Niigata Rheumatic Center…S672

14：00 ～ 15：00 Free papers Tumor 7: Pelvis & spine Moderators Y. Yazawa, T. Yanagawa

4-12-1 F unctional outcome of hip joint reconstruction without acetabular implant after pelvic tumor resection Liuzhe Zhang, et al., Saitama Medical Center, Jichi Medical Univ.…S673 4-12-2 S urgical outcomes in patients with peripheral chondrosarcoma of the pelvis: A multicenter study Yusuke Tsuda, et al., Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S673 4-12-3 S hort-term and long-term outcomes of treatment for pelvic tumor: A retrospective cohort comparison study between carbon-ion radiotherapy and surgical resection Liuzhe Zhang, et al., Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S674 4-12-4 A n approach based on collaboration with other occupations to maintain ADL for cancer patients Yasuhiro Shiga, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S674 4-12-5 H ow does metastatic spinal tumor affect “cancer locomo”? Katsuhito Yoshioka, et al., Dept. of Orthop. Surg., Kanazawa Medical Hosp.…S675 4-12-6 S pinal metastasis of myxoid liposarcoma: Significance and prognosis of MRI screening Chiaki Sato, et al., Dept. of Musculoskeletal Oncology and Rehabilitation, National Cancer Center Hosp.…S675

15：15 ～ 16：15 Free papers Moderators M. Hatori, Y. Shinoda Tumor 8: Metastatic bone tumor

4-12-7 A nalysis of bone mineral density of the proximal femur by prostate cancer induced osteoblastic metastatic lesions Hajime Rikitake, et al., Dept. of Orthop. Surg., National Defense Medical College…S676

― 114 ― 4-12-8 C linicopathological features of prostate cancer with osteolytic bone metastasis Yu Toda, et al., Dept. of Orthop. Surg., Saga Univ. Hosp.…S676 4-12-9 I nvestigation of therapeutic effect of immune checkpoint inhibitors on bone metastasis of non-small cell lung cancer Yohei Asano, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S677 4-12-10 C omparison of prognosis by surgical procedure for metastatic bone tumor of the appendicular skeleton Naoya Fujimaru, et al., Dept. of Orthop. Surg., Wajima Municipal Hosp.…S677 4-12-11 I s pathological fracture associated with prognosis in patients with metastatic bone tumors of the femur?: Analysis using propensity score matching Tomohisa Sakai, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S678 4-12-12 S hort-term prognosis of patients with proximal femur metastasis: Validation analysis of the revised Katagiri score and MEP score Tomohisa Sakai, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S678

4th Day May 23 Room 13

7：55 ～ 8：55 Free papers Moderators K. Wada, T. Abe Spine 10: Spinal alignment & general

4-13-1 R elationship between radiographic parameters of the frontal plane for lumbar spine and low back pain in the community Yota Kaneko, Dept. of Orthop. Surg., Fukushima Medical Univ.…S679 4-13-2 D istribution of spinal sagittal alignment based on hierarchical clustering Yusuke Hori, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S679 4-13-3 T he relationship between global spinal alignment and obesity with gender difference Kei Ando, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S680 4-13-4 T he accuracy between CT measured pelvic incidence and standing X-ray measured pelvic incidence Masahiro Iinuma, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S680 4-13-5 C linical significance of redundant nerve roots Yuki Fushimi, et al., Dept. of Orthop. Surg., School of Medicine, Fukushima Medical Univ.…S681 4-13-6 S acroiliac joint vacuum phenomenon Tadatsugu Morimoto, et al., Dept. of Orthop. Surg., Saga Univ.…S681

9：10 ～ 10：30 Free papers Moderators H. Murakami, S. Inami Spine 11: Adult spinal deformity 1

4-13-7 T he sloping type deformity is an independent factor for health-related quality of life impairment in elderly population Yuki Mihara, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S682 4-13-8 F at infiltration in back muscles and gluteus maximus muscle is significantly related to deterioration of spino-pelvic sagittal balance during gait Kousei Miura, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S682 4-13-9 A new global spinal balance classification in patients with adult spinal deformity Hiroaki Nakashima, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S683 4-13-10 N onoperative study of adult spinal deformity with minimum 2-year follow up Norichika Yoshie, Dept. of Orthop. Surg., Hyogo College of Medicine…S683

― 115 ― 4-13-11 A ssessment of intraoperative coronal spinal alignment using navigation tool of three-dimensional spinal rod bending system for adult spine deformity cases Masanari Takami, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S684 4-13-12 A nalysis of implants for lumbosacral spinal fusion using FEM Hiroyuki Tachi, et al., Dept. of Orthop. Surg., Eniwa Hosp.…S684 4-13-13 C ost-effectiveness of corrective fusion surgeries for patients with adult spinal deformities: A comparison by operative method Hideyuki Arima, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S685 4-13-14 D oes pulmonary function improve after surgical correction of adult scoliosis? Hiroaki Nakashima, Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S685

10：45 ～ 12：05 Free papers Moderators T. Kanemura, T. Akazawa Spine 12: Adult spinal deformity 2

4-13-15 P ostoperative assessment of adult spinal deformity and frequency of mechanical complications after instrumentationed surgery using the GAP score Ryosuke Oikawa, Dept. of Orthop. Surg., Iwate Medical Univ. …S686 4-13-16 P redictive index of proximal junctional kyphosis: Focusing on lumbar spinal mobility between standing and sitting position in radiographic study Takuhei Kozaki, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S686 4-13-17 P re-existing vertebral fracture is a risk factor for proximal junctional fracture after adult spinal deformity surgery: A propensity score-matched analysis Junya Katayanagi, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S687 4-13-18 T he incidence and risk factors of LIV failure in ASD patients who underwent surgical treatment of long fusion to L5 Shuta Ushio, et al., Dept. of Orthop. Surg., Kudanzaka Hosp.…S687 4-13-19 A djacent segment disease on hip joint as a complication of spinal fusion surgery including sacroiliac joint fixation Takuhei Kozaki, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S688 4-13-20 F actors of postoperative coronal malalignment following long spine fusion using lateral lumbar interbody fusion for adult spinal deformity Masanari Takami, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S688 4-13-21 C an the clinical outcome at 2-year postoperatively predict the clinical outcome at 5-year postoperatively in adult spinal deformity surgery? Hideyuki Arima, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S689 4-13-22 B one fusion process in circumferential MIS for adult spinal deformity Masayuki Ishihara, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S689

12：35 ～ 13：45 Luncheon seminar 47 Moderator K. Hirakawa

4-13-LS47 A n updated overview of the pharmacotherapy for low back pain based on clinical practice guidelines Takuya Nikaido, Dept. of Orthop. Surg., School of Medicine, Fukushima Medical Univ.…S690

14：00 ～ 15：00 Free papers Spine 13: Scoliosis 1 Moderators M. Ito, T. Kotani

4-13-23 T he association of scoliosis and NSD1 gene deletion in Japanese Sotos syndrome patients Masafumi Machida, et al., Dept. of Orthop. Surg., Saitama Childrenʼs Medical Center…S691 4-13-24 A n algorithm for using deep learning convolutional neural networks with three dimensional depth sensor imaging in scoliosis detection Terufumi Kokabu, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S691

― 116 ― 4-13-25 R elationship between vertebral body rotation and distal adding-on in Lenke type 1A-R with adolescent idiopathic scoliosis Ichiro Kawamura, Dept. of Orthop. Surg., Graduate School of Medical and Dental Sciences, Kagoshima Univ.…S692 4-13-26 T he finite element method reveals asymmetrical stress distribution in the facet joint of AIS Yasuhito Yahara, et al., Dept. of Orthop. Surg., Faculty of Medicine, Univ. of Toyama…S692 4-13-27 C omparison of differences in pedicle diameter measurements between MRI and CT in Lenke type 1 adolescent idiopathic scoliosis Terue Hatakenaka, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S693 4-13-28 I nvestigative study for postoperative axial neck pain and its associated parameters in the surgically treated adolescent idiopathic scoliosis patients Akira Matsumura, et al., Dept. of Orthop. Surg., Osaka City General Hosp.…S693

15：15 ～ 16：15 Free papers Spine 14: Scoliosis 2 Moderators K. Harimaya, G. Inoue

4-13-29 E valuation of spinal fusion area in the surgery for adolescent idiopathic scoliosis with lumbar modifier A-R type Satoshi Inami, et al., Dept. of Orthop. Surg., Dokkyo Medical Univ. School of Medicine…S694 4-13-30 I mpact of anchor type at UIV on postoperative shoulder balance and PJK in patients with adolescent idiopathic scoliosis Tsutomu Akazawa, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S694 4-13-31 C oronal and sagittal alignment change after implant removal: A comparison between hooks versus pedicle screws constructs in patients with AIS Ryoji Tauchi, et al., Dept. of Orthop. Surg., Meijo Hosp.…S695 4-13-32 A ccurate method for predicting intraoperative rod length on preoperative CT in AIS Type 1 Ayumu Kawakubo, et al., Dept. of Orthop. Surg., Kitasato Univ.…S695 4-13-33 I ntraoperative cone beam CT for pediatric scoliosis: Comparison of pedicle screw perforation rate at normal and low doses Yusuke Tanikawa, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S696 4-13-34 P redicting intraoperative total blood loss in posterior spinal fixation for adolescent idiopathic scoliosis Eiki Shirasawa, Dept. of Orthop. Surg., Kitasato Univ.…S696

4th Day May 23 Room 14

7：55 ～ 8：55 Free papers Spine 15: OPLL Moderators M. Iwasaki, K. Mori

4-14-1 C linical features in cervical ossification of posterior longitudinal ligament with increased spinal cord compression during neck flexion Kazuhiro Fujimoto, et al., Dept. of Orthop. Surg., Tokuyama Central Hosp.…S697 4-14-2 R isk factors for progression of ossification of posterior longitudinal ligament using longitudinal whole spine CT scan Yuichiro Hisada, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S697 4-14-3 M yelopathic pain due to ossification of the posterior longitudinal ligament of the cervical spin: Efficacy of surgical treatment Masahiko Takahata, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S698 4-14-4 R elationship between central motor conduction time and radiographic imaging in ossification of the posterior longitudinal ligament of cervical spine Yuji Nagao, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S698

― 117 ― 4-14-5 E fficacy of intraoperative intervention following Br(E)-MsEP alert during posterior decompression and fusion surgery for thoracic OPLL Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S699 4-14-6 S elective angiography detecting anterior spinal artery occlusion in thoracic ossification of posterior longitudinal ligament Go Yoshida, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S699

9：10 ～ 10：30 Free papers Moderators M. Ando, H. Shigematsu Spine 16: Spinal cord monitoring

4-14-7 N on-invasive functional evaluation of the upper cervical cord using magnetoneurography in healthy subjects Masaaki Paku, Dept. of Orthop. Surg., Kansai Medical Univ.…S700 4-14-8 N oninvasive functional evaluation of lumbar radiculopathy and cauda equina syndrome using magnetospinograph Jun Hashimoto, et al., Dept. of Orthop. and Spinal Surg., Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental Univ.…S700 4-14-9 D iagnosis of tight filum terminale by motor evoked potential Naosuke Kamei, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S701 4-14-10 E xamination of a new external anal sphincter recording method for preventing intraoperative bladder rectal disorder Yoshikazu Yanagisawa, et al., Dept. of Orthop. Surg., Fukuoka Mirai Hosp.…S701 4-14-11 T etanic stimulation of the peripheral nerve augments motor evoked potentials by re-exciting spinal anterior horn cells Yusuke Yamamoto, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S702 4-14-12 C an we use post-tetanic motor-evoked potential monitoring under general anesthesia with desflurane during spine surgery? Sachiko Kawasaki, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S702 4-14-13 V alidity of the alarm point in intraoperative neurophysiological monitoring formulated by monitoring working group of the JSSR Masahito Takahashi, Dept. of Orthop. Surg., Kyorin Univ. …S703 4-14-14 U sefulness of multimodal monitoring in neurophysiological monitoring for spine and spinal cord surgery Muneharu Ando, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S703

10：45 ～ 12：05 Free papers Moderators K. Ando, Y. Fujiwara Spine 17: Spinal cord tumor & spinal infection

4-14-15 C linical features and prognostic factors in spinal meningioma surgery Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S704 4-14-16 T herapeutic strategy for intramedullary astrocytomas in spinal cord Narihito Nagoshi, et al., Dept. of Orthop. Surg., Keio Univ. …S704 4-14-17 S urgical outcomes and factors related to postoperative motor and sensory deficits in resection for 244 cases of spinal schwannoma Kei Ando, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S705 4-14-18 D oes forced air warming increase surgical site infections in spine surgery?: A propensity score- matched analysis Kyoichi Handa, et al., Dept. of Orthop. Surg., Tohoku Univ. Graduate School of Medicine…S705 4-14-19 C linical features and functional prognosis after percutaneous endoscopic debridement for lumbar pyogenic spondylodiscitis Hiroyuki Tachi, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S706

― 118 ― 4-14-20 P redictors of prolonged hospitalization in pyogenic spondylitis Takuya Takahashi, et al., Dept. of Orthop. and Spinal Surg., Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental Univ.…S706 4-14-21 P roportion of discharge to home after hospitalization for spinal infection: The analysis of Japanese nationwide DPC database Michihaya Kono, et al., Dept. of Orthop., Shimane Univ.…S707 4-14-22 C linical effects of comprehensive medicine in treatment of pyogenic spondylitis in the elderly Hidekazu Yoshizaki, et al., Dept. of Orthop. Surg., Hokkaido Medical Center …S707

12：35 ～ 13：45 Luncheon seminar 48 Moderator N. Kawahara

4-14-LS48-1 A iming for further improvement of medication in rheumatoid arthritis patients: Difficult to treat rheumatoid arthritis, methotrexate and Janus Kinase inhibitors Yuji Hirano, Dept. of Rheumatology, Toyohashi Municipal Hosp.…S708 4-14-LS48-2 T he secret for a good practice of rheumatic disease for orthopaedic surgeons: Importance of imaging modalities in rheumatic disease Tadashi Okano, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S708

14：00 ～ 15：00 Free papers Spine 18: Spinal tumor Moderators Y. Matsumoto, H. Uei

4-14-23 R adiation disrupts the protective function of the spinal meninges in a mouse model of tumor-induced spinal cord compression Takaki Shimizu, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S709 4-14-24 T he surgical outcomes for metastatic spinal tumors: Palliative surgery for metastatic spinal tumors under 8 point of Tokuhashi score Masahiro Tanaka, et al., Dept. of Orthop. Surg., Tokai Univ.…S709 4-14-25 T he significance of circumferential decompression for metastatic tumor of thoracic spine Bungo Otsuki, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S710 4-14-26 I nvestigation of the complications associated with embolization of segmental artery prior to TES Ryohei Annen, et al., Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S710 4-14-27 P revalence and risk factors for development of venous thromboembolism after spinal tumor surgery Motoya Kobayashi, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S711 4-14-28 R isk factors for the early deterioration of general condition after spinal metastasis surgery: Based on the preoperative blood test Zhongying Zhang, et al., Div. of Spine Surg., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S711

15：15 ～ 16：15 Free papers Moderators H. Yasutake, A. Kimura Spine 19: Spinal complication

4-14-29 S urgical Apgar score are significant predictors of major complications after cervical surgery Kousei Miura, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S712 4-14-30 P eri-operative complications of open spine surgery in the elderly over 90 years of age Takeru Tsujimoto, et al., Spine Center, Hakodate Central Hosp.…S712 4-14-31 C omparison of perioperative blood loss according to use of aspirin in spine surgery Takamitsu Haku, et al., Dept. of Orthop. Surg., Osaka Saiseikai Hosp.…S713 4-14-32 L ow nutritional status and osteopenia of lumbar spine in patients with rheumatoid arthritis Eiji Takasawa, et al., Dept. of Orthop. Surg., Gunma Univ. Graduate School of Medicine…S713 4-14-33 5 cases of MRHE after spine surgery Yuki Kinoshita, et al., Dept. of Orthop., Osaka City Univ. Hosp.…S714 4-14-34 D id the adverse event happen after myelography ? : A retrospective study Hideki Shigematsu, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S714

― 119 ― 4th Day May 23 Room 1

16：20 ～ 16：50 Closing ceremony

Poster

＊ Candidates of the Best Poster Award

Poster (English) Tumor

Po-1 R esults following surgical resection of recurrent chordoma of the spine: Experience in a single institution Prakrit Suwanpramote, et al., Dept. of Orthop., Faculty of Medicine Ramathibodi Hosp., Mahidol Univ., Bangkok, Thailand…S715 Po-2 I liotibial tract flap for recovery and maintenance of the abduction after proximal femur tumor replacement with megaprosthesis Marcio Fernando A.P. Moura, et al., Dept. of Surg. Orthop. Section, Clinics Hosp. Federal Univ. of Parana, Curitiba, Brazil…S715 Po-3 E lbow en bloc resection and arthrodesis: An alternative to amputation Antonio Marcelo G. de Souza, et al., Orthop. Oncology Dept., Cancer Hosp. of Pernambuco, Recife, Brazil…S716 Po-4 A rm en bloc resection with distal upper limb preservation: An option to shoulder disarticulation Antonio Marcelo G. de Souza, et al., Orthop. Oncology Dept., Cancer Hosp. of Pernambuco, Recife, Brazil…S716 Po-5 F ibrodysplasia ossificans progressiva: Case report Antonio Marcelo G. de Souza, Orthop. Oncology Dept., Cancer Hosp. of Pernambuco, Recife, Brazil…S717 Po-6 S urgical outcome for bone metastases of the extremities and investigation of optimal timing of surgical intervention for different cancer types Yohei Asano, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S717 Po-7 P rognostic factors in patients with distant soft tissue metastasis of carcinoma Hiroyuki Tsuchie, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S718 Po-8 C hallenge of treating cancer amid the COVID-19 pandemic: Case of skeletal muscle metastasis from primary lung carcinoma mistaken for sarcoma Mamer S. Rosario, Dept. of Orthop., East Avenue Medical Center, Manila, Philippines…S718

Poster (English) Hip

Po-9 F emoral bone reaction in THA using rectangular curved-short stem Satoshi Nagoya, et al., Dept. of Musculoskeletal Biomechanics and Surgical Development, Sapporo Medical Univ.…S719 Po-10 E ffect of a pelvic incidence-lumbar lordosis mismatch on patient satisfaction after total hip arthroplasty: A 5-year follow-up study Yoshinori Okamoto, et al., Dept. of Orthop. Surg., Div. of Vital Care and Reconstructive Medicine, Osaka Medical College…S719 Po-11 A ge and perioperative outcomes after hip fracture surgery: Does octogenarian, nonagenarian, centenarian matter? Takahisa Ogawa, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S720 Po-12 ＊ S easonal impact on surgical site infections in hip fracture surgery: Analysis of 330,803 cases using a nationwide inpatient database Takahisa Ogawa, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S720 Po-13 P osteriorly-tilted pelvis after femoral head collapse in patients with hip osteonecrosis: A possible role in the collapse progression Mingjian Xu, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S721

― 120 ― Po-14 T hree-dimensional analysis of femoral curvature in Japanese population Xin Ma, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S721

Poster (English) Knee 1

Po-15 A daptation of Oxford criteria improve utilization of unicompartmental knee arthroplasty without compromising outcome: Experience of 150 Oxford mobile bearing UKA Man Hong Cheung, et al., Dept. of Orthop. and Traumatology, The Univ. of Hong Kong, Hong Kong…S722 Po-16 D iscrepant histological diagnoses: A cause of early poor FJS-12 score and unhappy TKR patient Sanjay B. Londhe, et al., Dept. of Orthop. Surg., Holy Spirit Hosp., Mumbai, India…S722 Po-17 T he short-term outcome after high tibial osteotomy with a 3d-printing navigation technology in medial knee osteoarthritis Yifan Li, et al., Dept. of Orthop. Surg., Fuyang Peopleʼs Hosp., Fuyang, China…S723 Po-18 S tudy of the effect of bilateral TKR on the coexisting lumbar spine symptoms Sanjay B. Londhe, et al., Dept. of Orthop. Surg., Holy Spirit Hosp., Mumbai, India…S723 Po-19 A cute-phase postoperative pain monitored at 4 hours after total knee arthroplasty may lead to 1-year postoperative pain Kazuha Kizaki, et al., Dept. of Orthop. Surg., Nekoyama Miyao Hosp.…S724 Po-20 D oes tibial rotational realignment in open-wedge high tibial osteotomy have an effect on patellofemoral joint during the 1-year follow-up period? Kazuha Kizaki, et al., Dept. of Orthop. Surg., Nekoyama Miyao Hosp.…S724 Po-21 G ait analysis of walking before and after medial opening wedge high tibial osteotomy Sang Jin Lee, Dept. of Orthop. Surg., Haeundae Paik Hosp., Inje Univ., Busan, Korea…S725

Poster (English) Knee 2

Po-22 M edial meniscus posterior root repair using different fixation methods: Magnetic resonance imaging analysis Shiro Fukuoka, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S726 Po-23 G eometric analysis of the native anterior cruciate ligament Tomomasa Nakamura, et al., Dept. of Joint Surg. and Sports Med., Tokyo Medical and Dental Univ.…S726 Po-24 R ole of the posterior fan-like extension fibers of the human anterior cruciate ligament femoral insertion on the failure load Ryo Kanto, et al., Dept. of Orthop. Surg., Univ. of Pittsburgh, Pittsburgh, PA, USA…S727 Po-25 P reventive effect of boiogito, a kampo medicine, on post-traumatic osteoarthritis in rats Takayuki Okumo, et al., Dept. of Physiology, Showa Univ.…S727 Po-26 P ullout repair provides good clinical outcomes in patients with complete radial or oblique tears of medial meniscus posterior root Naohiro Higashihara, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S728 Po-27 F ibrin monomer complex is correlated with the volume of deep vein thrombosis after knee surgery Manabu Akagawa, et al., Dept. of Orthop. Surg., Omagari Kousei Medical Center…S728

Poster (English) Spine

Po-28 ＊ E lbow extension treatment using hybrid assistive limb for patients with complete quadriplegia due to cervical spinal cord injury Yukiyo Shimizu, et al., Dept. of Reha. Med., Univ. of Tsukuba…S729 Po-29 ＊ D oes diabetes affect the surgical outcomes in cases with cervical ossification of the posterior longitudinal ligament? Narihito Nagoshi, et al., Dept. of Orthop. Surg., Keio Univ. …S729 Po-30 D evelopment of Qolo for voluntary sit-to-stand and stand-to-sit posture transitions and standing mobility of persons with spinal cord injury Hideki Kadone, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S730

― 121 ― Po-31 W hat factor induces stress of patients with AIS under brace treatment?: Analysis of specific factor using exploratory factor analysis Tomoyuki Asada, et al., Dept. or Orthop. Surg., Univ. of Tsukuba…S730 Po-32 F ull neurological recovery after total en bloc spondylectomy in Frankel A Enneking stage III giant cell tumors of the spine Permsak Paholpak, et al., Dept. of Orthop., Khon Kaen Univ., Khon Kaen, Thailand…S731 Po-33 I ndirect neural decompression by minimally invasive-transforaminal lumbar interbody fusion for lumbar degenerative spondylolisthesis: Comparison with lateral lumbar interbody fusion Ichiro Torigoe, et al., Dept. of Orthop. Surg., Saiseikai Kawaguchi General Hosp.…S731 Po-34 T he impact of paraspinal muscle on incidence of proximal junctional kyphosis as an independent risk factor Kosuke Sato, et al., Dept. of Orthop. Surg., Hosp. for Special Surg., New York, NY, USA…S732 Po-35 ＊ E ffect of low-intensity home-based back strengthening exercise on sagittal spino-pelvic alignment for elderly women Michio Hongo, Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S732 Po-36 T he potential of paralumbar muscle health as a predictor of sarcopenia Kosuke Sato, et al., Dept. of Orthop. Surg., Hosp. for Special Surg., New York, NY, USA…S733

Poster (English) Trauma 1

Po-37 C linical results of bipolar hemiarthroplasty for femoral neck fractures: A multicenter prospective observational study Tetsuya Jinno, et al., Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S734 Po-38 ＊ A ssociation between hospital surgical volume and complications after total hip arthroplasty in femoral neck fracture: A propensity score-matched cohort study Takahisa Ogawa, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S734 Po-39 M inimally invasive medial hip approach for pipkin type 1 fracture treatment: Surgical technique, quality of reduction and postoperative complication Sanyakupta Boonperm, Dept. of Orthop., Chonburi Hosp., Chonburi, Thailand…S735 Po-40 A rthroscopic debridement and autologous micronized adipose tissue injection in the treatment of advanced-stage post-traumatic osteoarthritis of the ankle Yoshiharu Shimozono, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S735 Po-41 R adiographic assessment of distal radius fracture treatment outcomes following various types of fracture stabilization Piotr Morasiewicz, et al., Dept. and Clinic of Orthop. and Traumatologic Surg., Wroclaw Med. Univ., Wroclaw, Poland…S736 Po-42 A ten year review: Minimally invasive dorsal distraction plating in significantly comminuted distal radius fractures Luke Thornton, et al., Macclesfield Hosp., Chester, UK…S736

Poster (English) Trauma 2

Po-43 M id-term outcomes after Regan-Morrey type II III ulna coronoid fractures treated with mini-plate and K-wire fixation Yifan Li, et al., Dept. of Orthop. Surg., Fuyang Peopleʼs. Hosp., Fuyang, China…S737 Po-44 P ullout repair of the lateral meniscus posterior root tear concomitant with anterior cruciate ligament reconstruction reduces lateral meniscus extrusion Yuki Okazaki, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S737 Po-45 S implified Kirschner wire based dynamic external fixator for unstable proximal interphalangeal joint fractures Tarek Aly, Dept. of Orthop. Surg., Tanta Univ. Hosp., Tanta, Egypt…S738 Po-46 T he incidence and union rate of the ulnar styloid fractures associated with the distal radius fractures treated with VLP Shinsuke Morisaki, et al., Dept. of Orthop. Surg., Saiseikai Shiga Hosp.…S738 Po-47 H istological analysis of autologous fascia lata graft healing after superior capsule reconstruction in rabbit models Akihiko Hasegawa, et al., Dept. of Orthop. Surg., Div. of Vital Care and Reconstructive Medicine, Osaka Medical College…S739

― 122 ― Po-48 A wareness and protection status of our doctors against radiation exposure of lens Hiroo Shiraga, et al., Dept. of Orthop. Surg., Nagoya City East Center…S739

Poster (English) Lower extremity

Po-49 ＊ C ombination of radiographic apparent bone gap and nonunion risk determination score improves accuracy of prediction of tibial shaft delayed union Shuhei Hiyama, et al., Dept. of Orthop., Jichi Medical Univ.…S740 Po-50 E fficacy of unfocused extracorporeal shock waves for the treatment of non-insertional Achilles tendinopathy Yoshiharu Shimozono, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S740 Po-51 E ndoscopic versus open superior peroneal retinaculum repair in peroneal tendon dislocation: A comparative study Youichi Yasui, et al., Dept. of Orthop. Surg., Teikyo Univ.…S741 Po-52 E valuation of the quality and readability of online sources on the diagnosis and management of osteochondral lesions of the ankle Yoshiharu Shimozono, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S741 Po-53 A case of gossypiboma developing from isolated polyurethane fibers following negative pressure wound therapy Christian Emmanuel M. Fontanilla, et al., Dept. of Orthop., East Avenue Medical Center, Quezon City, Philippines…S742 Po-54 E piphyseal separations due to scurvy in children with spastic cerebral palsy Vikas Trivedi, et al., Dept. of Orthop., Era Univ. Hosp., Lucknow, India…S742

Poster Osteoporosis 1: Medication 1

Po-55 C urrent status of treatment of osteoporotic vertebral fracture, prevention from secondary fracture and future subject Takahiro Ushimaki, Dept. of Orthop. Surg., Tokyo Rinkai Hosp.…S743 Po-56 ＊ T reatment results of osteoporosis in high bone turnover Takashi Nagai, et al., Dept. of Orthop. Surg., Showa Univ.…S743 Po-57 ＊ I njection site comparison for reducing side effects of weekly teriparatide: Upper arm vs. olecranon subcutaneous injection techniques Osahiko Tsuji, et al., Dept. of Orthop. Surg., Keio Univ. …S744 Po-58 E ffect of bisphosphonate preparation on renal function Takashi Nagai, et al., Dept. of Orthop. Surg., Showa Univ.…S744 Po-59 ＊ T he predictors of efficacy in treatment osteoporosis with zoledronic acid for one year: Multiple regression analysis Yuji Hirano, et al., Dept. of Rheumatology, Toyohashi Municipal Hosp.…S745 Po-60 M id-term therapeutic effect of denosumab: Factors involved in increase of bone mineral density Tsuyoshi Asano, et al., Dept. of Orthop. Surg., KKR Sapporo Medical Center…S745 Po-61 R elationship between serum 25(OH) vitamin D concentration and therapeutic effect by denosumab and vitamin D in the primary osteoporosis treatment Ryosuke Sugimoto, et al., Dept. of Orthop. Surg., Toyota Kosei Hosp.…S746

Poster Osteoporosis 2: Medication 2

Po-62 A dverse events and persistence rate after introduction of active vitamin D preparations for osteoporosis Hirofumi Namba, et al., Dept. of Orthop. Surg., Kochi Medical School, Kochi Univ.…S747 Po-63 E fficacy verification of romosozumab treatment comparing final pretreatment just before romosozumab: Results at 6 months Ayako Tominaga, et al., Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ. Hosp.…S747 Po-64 T he effects romosozumab on strength of the proximal femur: A prospective 3-months longitudinal study using finite element analysis Soji Tani, et al., Dept. of Orthop. Surg., Showa Univ.…S748 Po-65 T herapeutic effect of romosozumab in osteoporosis patients with treatments of cancers Kenji Ikuta, et al., Dept. of Orthop. Surg., Kainan Hosp.…S748

― 123 ― Po-66 T herapeutic effect of romosozumab after prior treatment in osteoporosis Koji Tateishi, et al., Dept. of Orthop. Surg., Konan Kakogawa Hosp.…S749 Po-67 B one metabolic markers at the start of romosozumab are associated with increased bone density for 6 months and 1 year Kosuke Arita, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S749 Po-68 C linical efficacy of romosozumab in patients with primary osteoporosis and rheumatoid arthritis Yasuhide Kanayama, et al., Dept. of Orthop. Surg., Toyota Kosei Hosp.…S750

Poster Osteoporosis 3: General 1

Po-69 A ssessment of osteoporosis in elderly rheumatoid arthritis patients Yasuyuki Omichi, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S751 Po-70 W hat is the risk factor for vertebral fractures or lower lumbar vertebral fractures? Tatsuki Miyata, et al., Dept. of Orthop. Surg., Kitasato Univ.…S751 Po-71 A nalysis of vitamin D status and osteoporosis-related parameters in distal radius fracture patients Sang Yang Lee, et al., Dept. of Orthop. Surg., Showa Univ.…S752 Po-72 I ntervention in the treatment of osteoporosis in patients with distal radius fracture surgery Hikaru Saito, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S752 Po-73 A nalysis of vitamin D status and osteoporosis-related parameters in hip fracture patients Sang Yang Lee, et al., Dept. of Orthop. Surg., Showa Univ.…S753 Po-74 P itfall of diagnosis for atypical femoral fracture: Multicenter study of the prodromal symptom mimicing other locomotrium diseases Tatsuji Fujiwara, et al., Dept. of Orthop. Surg., Osaka General Medical Center…S753 Po-75 P revalence of pain and neuropathic pain in patients with osteoporosis Akiyoshi Kuroda, et al., Dept. of Orthop. Surg., Kitasato Univ.…S754

Poster Osteoporosis 4: General 2

Po-76 R elationship between bone mineral density and lifestyle-related diseases and salt intake Yuki Takeuchi, et al., Dept. of Orthop. Surg., Enshu Hosp.…S755 Po-77 B one quality in patients with hip fracture Takashi Iwakura, et al., Dept. of Orthop. Surg., Sanda City Hosp.…S755 Po-78 F irst one year of the osteoporotic liaison service team which had raised in our advanced acute care hospital Kenji Ikuta, et al., Dept. of Orthop. Surg., Kainan Hosp.…S756 Po-79 E xamination of female patients with trigger fingers and bone mineral density Jo Watanabe, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S756 Po-80 A ge-related change in the cortical bone microstructure of the distal radius: Analysis by HR-pQCT Shingo Ota, et al., Dept. of Orthop. Surg., Nagasaki Univ. Graduate School of Biomedical Sciences…S757

Poster Shoulder 1: Arthroplasty

Po-81 ＊ C omputed tomography analysis of all-polyethylene pegged glenoid component after total shoulder arthroplasty more than 10 years Yuki Matsui, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S758 Po-82 ＊ O ptimal position of the center peg for baseplate fixation in reverse total shoulder arthroplasty Ei Teshima, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S758 Po-83 E ffect of anatomical position and ROM on glenosphere with lateral and inferior offset Katsutoshi Miyatake, et al., Dept. of Orthop. Surg., Yoshinogawa Medical Center…S759 Po-84 3 D simulation range of motion comparison between medialized RSA and lateralized RSA Yoshihiro Hirakawa, Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S759

― 124 ― Po-85 R ole of intraoperative navigation in the fixation of the glenoid component in reverse shoulder arthroplasty Yuji Shibayama, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S760 Po-86 S imple X-ray change around the cementless short stem 2 years after surgery Ryuichi Yamashita, Dept. of Orthop. Surg., Osaka City Univ. Hosp.…S760 Po-87 P ostoperative radiographic effect factor using reverse shoulder arthroplasty with an uncemented short stem Nobuyasu Ochiai, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S761 Po-88 L ess reaming technique and smaller stem size decreased humeral bone resorption after reverse shoulder arthroplasty Atsushi Urita, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S761

Poster Shoulder 2: Rotator cuff tear 1

Po-89 T he relationship between a retear and the stump classification in the suture bridge repair technique and double-row repair technique: Multicenter study Naohide Takeuchi, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S762 Po-90 T he outcomes of arthroscopic rotator cuff repair in patients over 70 years Yohei Harada, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S762 Po-91 T he short-term clinical outcome of surgery for irreparable rotator cuff tear Koji Akimoto, et al., Dept. of Orthop. Surg., Chiba Rosai Hosp.…S763 Po-92 E ffectiveness of measuring tension during arthroscopic rotator cuff repair Shin Yokoya, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S763 Po-93 C linical outcome of arthroscopic rotator cuff repair for rotator cuff tear with shoulder stiffness Toshiaki Hirose, et al., Asabu Orthop. Hosp.…S764 Po-94 L ong term clinical outcomes of arthroscopic rotator cuff repair Hironori Kakoi, et al., Dept. of Orthop. Surg., Chuo Hosp.…S764 Po-95 T he factors influencing of postoperative results of arthroscopic rotator cuff repair combined with muscle advancement for massive rotator cuff tear Yasuhiko Sumimoto, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S765

Poster Shoulder 3: Rotator cuff tear 2

Po-96 E ffect of the abduction brace fixed period after arthroscopic repair of small and medium rotator cuff tears Masahiro Izumi, Dept. of Orthop. Surg., Saga Univ.…S766 Po-97 T he influence of the size of rotator cuff tears for the decrease of the bone density of the glenoid Yoshihiko Nagata, et al., Dept. of Orthop. Surg., Hiroshima-Nishi Medical Center…S766 Po-98 T he classification of repair or reconstruction method for rotator cuff tear in our hospital analyzed by decision tree Kiyoshi Sada, et al., Dept. of Orthop. Surg., Nagasaki Univ. Graduate School of Biomedical Sciences…S767 Po-99 T he change in the T-scale before and after ARCR Shingo Maesako, et al., Dept. of Orthop. Surg., Kagoshima Univ. Hosp.…S767 Po-100 P reliminary results of the dynamic evaluation of the supraspinatus function through the ultrasound movie Ryuzo Arai, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S768 Po-101 S capula morphology with or without rotator cuff tear Yoshihiro Nakamura, et al., Dept. of Orthop. Surg., Chugoku Rosai Hosp.…S768 Po-102 R elations of the proximal humeral bone density to operative procedure selections and postoperative re-tears in larger sized rotator cuff tears Yoshihiko Nagata, et al., Dept. of Orthop. Surg., Hiroshima-Nishi Medical Center…S769

― 125 ― Poster Shoulder 4: General

Po-103 D ynamic in vivo relationship between acromioclavicular joint and coracoclavicular space during humeral elevation Akira Sugi, et al., Dept. of Orthop. Surg., Kushiro Red Cross Hosp.…S770 Po-104 ＊ M uscle activities during arm elevation assessed by positron emission tomography after reconstruction surgeries for irreparable rotator cuff tears Kiyotsugu Shinagawa, et al., Dept. of Orthop. Surg., Tohoku Univ. Graduate School of Medicine…S770 Po-105 A rthroscopic biceps tenodesis using a soft anchor and bioabsorbable interference screw Naoya Hirosawa, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S771 Po-106 T he change of the anchor hole diameters after arthroscopic Bankart repair and its impact on the clinical outcome Yusuke Kawamura, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S771 Po-107 T he change of D-dimer value and the incidence of deep vein thrombosis after ARCR and TSA Koji Akimoto, et al., Dept. of Orthop. Surg., Chiba Rosai Hosp.…S772 Po-108 F actors affecting outcomes of conservative management for pseudoparalysis of the shoulder Hiroshi Hashiguchi, et al., Dept. of Orthop. Surg., Yonekura Spine & Joint Hosp.…S772 Po-109 E valuation of MRI after silent manipulation of the frozen shoulder Kazuma Miyatake, Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S773 Po-110 Q uantitative evaluation of joint capsule in frozen shoulder using radial MRI Akio Otoshi, et al., Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S773

Poster TKA & UKA 1: Surgical outcome

Po-111 Q uantitative evaluation of patellar cartilage thickness after ceramic total knee replacement by magnetic resonance imaging: A longitudinal study Dai Sato, et al., Dept. of Orthop. Surg., NTT East Japan Sapporo Hosp.…S774 Po-112 F ive-to-nine year clinical outcomes of modular unlinked bicompartmental knee arthroplasty (BiKA) for medial and patellofemoral osteoarthritis of the knee Rikiya Baba, et al., Dept. of Orthop. Surg., Hakodate Orthop. Clinic…S774 Po-113 L ong-term clinical outcomes of total knee arthroplasty after high tibial osteotomy Kazuhiko Saeki, et al., Dept. of Orthop. Surg., Fukuoka Sanno Hosp.…S775 Po-114 B etter patient-reported outcomes after medial pivot TKA than conventional posterior stabilized TKA: A multivariate analysis of 302 cases Susumu Takemura, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S775 Po-115 P ostoperative results with a fixed bearing UKA Toshinori Omori, et al., Dept. of Orthop. Surg., Okayama Rosai Hosp.…S776 Po-116 A comparison of mid- to long-term patient reported outcomes after medial opening-wedge high tibial osteotomy and mobile-bearing unicompartmental knee arthroplasty Shinichiro Okimura, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S776 Po-117 T hree-year clinical results of a CR type of the FINE total knee through the measured resection technique Arata Nakajima, et al., Dept. of Orthop. Surg., Toho Univ.…S777

Poster TKA & UKA 2: Complication

Po-118 T hreshold of medial knee looseness to trigger off the patient dissatisfaction one-year after total knee arthroplasty Takao Inokuchi, et al., Dept. of Orthop. Surg., Steel Memorial Hirohata Hosp.…S778 Po-119 P redictors of perioperative blood loss in total knee arthroplasty Mochihito Suzuki, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S778

― 126 ― Po-120 P otential risk of medial cortex perforation due to peg position of Persona-Uni tibial component in unicompartmental knee arthroplasty Keiji Tensho, Dept. of Orthop. Surg., Shinshu Univ.…S779 Po-121 E ffects of biologics on total knee arthroplasty with rheumatoid arthritis Joji Matsubara, Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S779 Po-122 U se of tranexamic acid in total knee arthroplasty is not a risk factor for deep venous thrombosis Ryunosuke Sakamoto, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S780 Po-123 C ement-on-cement knee articulating antibiotic-loaded spacer works well in the knee arthroplasty infection Kazuya Uehara, et al., Dept. of Orthop. Surg., Yamaguchi Prefectural Grand Medical Center…S780 Po-124 E ffect of keishibukuryogan on preventing venous thromboembolism after total knee arthroplasty Yuji Yamamoto, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S781

Poster TKA & UKA 3: General

Po-125 ＊ E valuation of PF sagittal tilting angle with anatomic patellar in ATTUNE TKA Hidehiko Kido, et al., Yamaguchi Red Cross Hosp.…S782 Po-126 ＊ U sefulness of closed stance X-ray in joint line orientation evaluation after TKA Shuji Toyono, et al., Dept. of Orthop. Surg., Yamagata Univ.…S782 Po-127 T he alteration in NGF concentration due to surgical invasion of total knee arthroplasty Tomohiro Onodera, et al., Dept. of Orthop. Surg., Hokkaido Univ. Hosp.…S783 Po-128 C omparison of preoperative continuation and discontinuation of anticoagulants in patients undergoing total knee arthroplasty Takashi Nakamura, Dept. of Orthop. Surg., Toho Univ.…S783 Po-129 ＊ P reoperative prediction of pain catastrophizing scale (PCS) for the expectations after total knee arthroplasty (TKA) Hisashi Mera, et al., Dept. of Orthop. Surg., Uonuma Kikan Hosp.…S784 Po-130 I ntraoperative kinematic and virtual gap analysis of PS-TKA with pre-cut technique using navigation system Kodai Hamaoka, et al., Dept. of Orthop. Surg., Sunagawa City Medical Center…S784 Po-131 F lexion joint gap increased in internal rotation and decreased in external rotation for medial pivot knee prosthesis Yukihide Minoda, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S785

Poster TKA & UKA 4: Surgical outcome & general

Po-132 ＊ R elationship between muscular strength, activity and body composition preoperative and postoperative total knee arthroplasty Kyohei Nagayama, Dept. of Orthop. Surg., Tokyo Medical Univ.…S786 Po-133 ＊ P ostoperative weight gain in total knee arthroplasty worsen clinical outcomes Yuichi Kishimura, et al., Dept. of Orthop. Surg., Naniwa Ikuno Hosp.…S786 Po-134 C omparison of effectiveness and safety of simultaneous bilateral total knee arthroplasty among 60s, 70s, and 80s Akane Ariga, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S787 Po-135 M uscle cross-section measurement by CT image to evaluate muscle recovery process in lower extremities after total knee arthroplasty Hanako Tsuji, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S787 Po-136 N europathic pain is less involved in patients with advanced osteoarthritis of the knee that requires total knee arthroplasty Satomi Ota, Dept. of Orthop. Surg., Teikyo Univ.…S788 Po-137 R isk factors for development of sleep disorder and relationship with pain after total knee arthroplasty Atsushi Fukumoto, Dept. of Orthop. Surg., The Hosp. of Hyogo College of Medicine…S788 Po-138 T he result of accelerating the time of additional cocktail injection on the day after surgery at TKA Hideto Fujii, et al., Dept. of Orthop. Surg., Saiseikai Toyama Hosp.…S789

― 127 ― Poster TKA & UKA 5: Implant

Po-139 B icruciate retaining total knee arthroplasty cannot reproduce normal knee kinetics during gait Taiki Furumoto, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S790 Po-140 C omparison of clinical results of CR-TKA and PS-TKA for valgus knee Kunihiko Watamori, et al., Dept. of Joint Reconstruction., Ehime Univ. Graduate School of Medicine…S790 Po-141 A nteroposterior stability in bi-cruciate stabilized total knee arthroplasty and bi-cruciate retaining total knee arthroplasty: Comparison with cruciate-retaining total knee arthroplasty Taku Nakajima, et al., Dept. of Orthop. Surg., Yamagata Univ.…S791 Po-142 A ssessing soft tissue changes over time after bicruciate stabilized total knee arthroplasty Ryota Fujii, et al., Dept. of Orthop. Surg., Nihon Univ. Hosp.…S791 Po-143 C hanges in posterior condylar offset measured during surgery do not correlate with knee flexion after posterior-stabilized total knee arthroplasty Kunio Yamada, et al., Dept. of Orthop. Surg., Komaki City Hosp.…S792 Po-144 T emporal change of the result of total knee arthroplasty in different implant by using New Knee Society Knee Scoring System Takenori Tomite, et al., Dept. of Orthop. Surg., Akita Red Cross Hosp.…S792 Po-145 T he clinical results of unicompartmental arthroplasty compared to total knee arthroplasty in hemodialysis patients Atsuo Inoue, et al., Dept. of Orthop. Surg., Japanese Red Cross Society Kyoto Daiichi Hosp.…S793

Poster TKA & UKA 6: Implant installation

Po-146 E ffect of rotational installation angle of femoral component on long-term outcome of TKA Toshihiko Goto, Dept. of Orthop. Surg., Hiroshima Prefectural Akitsu Hosp.…S794 Po-147 F eatures of rotational malalignment of femoral component in total knee arthroplasty with CT free navigation using 3D evaluation Keisuke Hoshino, et al., Dept. of Orthop. Surg., Komaki City Hosp.…S794 Po-148 A nterior border of the tibia and fibula axis as anatomic references for tibial sagittal alignment in total knee arthroplasty Keinosuke Ryu, Dept. of Orthop. Surg., Nihon Univ.…S795 Po-149 C an we accurately measure the femoral valgus correction angle for the intramedullary alignment rod using long-standing anteroposterior radiographs in TKA? Yosuke Hattori, et al., Dept. of Orthop. Surg. and Rheumatology, Nagoya Medical Center…S795 Po-150 E ffects of rotational alignment of tibial component on intraoperative kinematics in navigated total knee arthroplasty Koji Aso, et al., Dept. of Orthop. Surg., Kochi Medical School, Kochi Univ.…S796 Po-151 E ffect of preoperative factor on patient satisfaction after kinematically aligned total knee arthroplasty Kemmei Ikuta, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S796 Po-152 R otational kinematics change after medial unicondylar knee arthroplasty Kensuke Hotta, Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S797

Poster TKA & UKA 7: Surgical support

Po-153 E xamination of complications due to total knee arthroplasty using navigation tracker screw Masahiko Yanagisawa, et al., Dept. of Orthop. Surg., National Disaster Medical Center…S798 Po-154 P redicting the amount of the cutting bone of anterior tibial condyles in the UKA using preoperative CT will reduce recut Makoto Nishimori, et al., Dept. of Orthop. Surg., Asa Citizens Hosp.…S798 Po-155 C hange of UKA operation time with NAVIO system Shu Kobayashi, et al., Dept. of Orthop. Surg., Keio Univ.…S799 Po-156 T ransition of the joint line after unicompartmental knee arthroplasty Fuyuki Tominaga, Fukuoka Orthop. Hosp.…S799

― 128 ― Po-157 M id-term clinical results after posterior-stabilized TKA using extramedullary system Yohei Okada, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S800 Po-158 E valuation of distal femoral bone cut position by posterior condyle reference in total knee arthroplasty using three-dimensional preoperative planning Hiroyuki Onuma, et al., Dept. of Orthop. Surg., Kawasaki Municipal Tama Hosp. …S800 Po-159 A ccuracy of robotic-arm assisted total knee arthroplasty Izumi Saito, et al., Dept. of Orthop. Surg., Shin-Yurigaoka General Hosp.…S801

Poster Knee 1: Meniscus 1

Po-160 S onographic evaluation of medial meniscus extrusion of 3 types of meniscus repair methods simultaneously with high tibial osteotomy Tomoyuki Suzuki, et al., Sapporo Maruyama Orthop. Hosp.…S802 Po-161 M RI findings of pull-out repair alone and combined different centralization for the medial meniscus posterior root tear Naoki Sugita, et al., Dept. of Orthop. Surg., Saitama Medical Univ.…S802 Po-162 T wo years result of pull out repair concomitant with meniscal centralization for the treatment of medial meniscus posterior root tear Makoto Kobayashi, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S803 Po-163 S hort-term results of lateral meniscal allograft transplantation Suguru Kuwata, et al., Dept. of Orthop., Shimane Univ.…S803 Po-164 C linical results of meniscus repair in middle and old age Takuya Omodaka, et al., Dept. of Orthop. Surg., Zenshukai Hosp.…S804 Po-165 E xamination of the factor to influence meniscus tear treatment result of athlete for the period of growth Chihiro Kubota, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S804 Po-166 M eniscus tear type gives different meniscus repair outcome Mahiro Ohno, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S805

Poster Knee 2: Meniscus 2

Po-167 E xtrusion of discoid lateral meniscus in skeletally mature cases: Progression before and after surgery and comparison with normal lateral meniscus Kazuya Nishino, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S806 Po-168 D uration from injury to surgery was associated with the deterioration of meniscal tear in patients with isolated meniscal tear Takuji Yokoe, Div. of Orthop. Surg., Univ. of Miyazaki…S806 Po-169 S teep medial tibial slope and prolonged delay to surgery are associated with bilateral medial meniscus posterior root tear Takaaki Hiranaka, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S807 Po-170 T he relationship between medial radial displacement after pull out technique for medial meniscus root tear and lower limb alignment Shinya Yanagisawa, et al., Dept. of Orthop. Surg., Zenshukai Hosp.…S807 Po-171 R ecognition rate and treatments of medial meniscus posterior root tear among orthopaedic surgeons and residents: A questionnaire survey Ryota Shimozono, et al., Dept. of Orthop. Surg., Kobe Univ. Hosp. …S808 Po-172 P ositional relationship between the lateral meniscus and popliteal artery viewed from the transpatellar portal in all-inside lateral meniscal repair Jumpei Inoue, et al., Dept. of Orthop. Surg., Komaki City Hosp.…S808 Po-173 F actors responsible for cyst formation after meniscus repair Toshihiro Seki, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Hosp.…S809

― 129 ― Poster Knee 3: Patella dislocation

Po-174 ＊ C hange of joint awareness after medial patellofemoral ligament reconstruction for recurrent dislocation of patella Masafumi Itoh, et al., Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ.…S810 Po-175 ＊ E valuation to patellar instability of knee joint rotational alignment using 3D-CT image Yuichi Shibairi, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S810 Po-176 C hanges in patellofemoral joint alignment after MPFL reconstruction Yuji Arai, et al., Dept. of Sports and Para-Sports Medicine, Graduate School of Medical Science, Kyoto Prefectural Univ. of Medicine…S811 Po-177 I nvestigation of the association between lateral retinaculum thickness on MRI and radiographic patellar tilt angle in recurrent patellar dislocation patients Kyohei Nakata, et al., Dept. of Orthop. Surg., Hiroshima Univ. Hosp.…S811 Po-178 ＊ S hort-term postoperative clinical outcomes of medial patellofemoral ligament (MPFL) reconstruction using the shallow layer of the quadriceps tendon Chiharu Inoue, et al., Hokushin Orthop. Hosp.…S812 Po-179 C linical outcome of anatomical medial patellofemoral ligament reconstruction using virtual X-ray image reconstructed from three-dimensional computed tomography Masakazu Ishikawa, et al., Dept. of Artificial Joints and Biomaterials, Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S812 Po-180 I nvestigation of optimal method acquiring tangential view in patellofemoral joint in the patients with recurrent patellar dislocation Masakazu Ishikawa, et al., Dept. of Artificial Joints and Biomaterials, Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S813

Poster Knee 4: Osteotomy 1

Po-181 A study of the usefulness of digital planning in high tibial osteotomy Tetsuya Inui, et al., Dept. of Orthop. Surg., Koshigaya Municipal Hosp.…S814 Po-182 L eg length change after opening wedge high tibial osteotomy and hybrid-closed wedge high tibial osteotomy and examination of influencing factors Shu Takagawa, et al., Dept. of Orthop. Surg., Yokohama City Univ. Medical Center…S814 Po-183 E valuation of joint line convergency angle in high tibial osteotomy: Comparison between open wedge and closed wedge osteotomy Goki Kamei, Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S815 Po-184 R elationship between lower limb alignment changes and hindfoot alignment changes in around knee osteotomy for varus knee osteoarthritis Shota Morimoto, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S815 Po-185 E ffects of valgus alignment of the knee joint on ankle alignment by high tibial osteotomy Takumi Sakamoto, et al., Dept. of Orthop. and Rehabilitation Medicine, Univ. of Fukui…S816 Po-186 E valuation of postoperative alignment of knee and ankle joint after high tibial osteotomy Fumiyoshi Kawashima, et al., Dept. of Orthop. Surg., Fujigaoka Hosp., Showa Univ.…S816 Po-187 D ouble level osteotomy affects on knee and ankle joint obliquity Tomohiko Murakami, et al., Dept. of Orthop. Surg., Shiroyama Hosp.…S817

Poster Knee 5: Osteotomy 2

Po-188 C orrelation between the degree of osteoarthritis and the clinical outcome of mid-term to long-term follow-up in high tibial osteotomy Umito Kuwashima, et al., Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ. Hosp.…S818

― 130 ― Po-189 C linical evaluations of the “Acute oblique fibular osteotomy with suture ligation” procedure performed with inversed V-shaped high tibial osteotomy Jun Yamaguchi, et al., Dept. Orthop. Surg., Yagi Orthop. Hosp.…S818 Po-190 T he change of knee stability with tibial condylar valgus osteotomy Yasushi Oshima, et al., Dept. of Orthop. Surg., Nippon Medical School, Graduate School of Medicine…S819 Po-191 A ssessment of TKA conversion after high tibial osteotomy Kazunari Kuroda, et al., Dept. of Orthop. Surg., Yawata Medical Center…S819 Po-192 ＊ P ostoperative outcomes comparing UKA and HTO with forgotten joint score 12: A multicenter study Shotaro Watanabe, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S820 Po-193 E ffect of obesity on postoperative outcomes of medial open wedge high tibial osteotomy Moritaka Maruyama, et al., Dept. of Orthop. Surg., Iwate Medical Univ. …S820 Po-194 F actors affecting sports performance in medial open large high tibial osteotomy (OWHTO) Mikio Shioda, et al., Dept. of Orthop. and Spinal Surg., Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental Univ.…S821

Poster Knee 6: Osteotomy 3

Po-195 C omparison of the effects of the conventional OWHTO and OWDTO on the patellofemoral articular cartilage Koya Anan, Dept. of Orthop. Surg., Fukuoka Rehabilitation Hosp.…S822 Po-196 R elationship between plate position and bone union in open wedge high tibial osteotomy Naoko Araya, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S822 Po-197 A nalysis of the relationship between lateral hinge fractures and bone healing after medial open-wedge high tibial osteotomy Shuji Nakagawa, et al., Dept. of Sports and Para-Sports Medicine, Graduate School of Medical Science, Kyoto Prefectural Univ. of Medicine…S823 Po-198 A comparative study of bone resorption in medial opening-wedge HTO Kosuke Umemura, Dept. of Orthop. Surg., Gifu Univ. Hosp.…S823 Po-199 A nalysis of surgical site infection after opening wedge high tibial osteotomy Hirofumi Hanada, et al., Dept. of Orthop. Surg., Fukuoka Rehabilitation Hosp.…S824 Po-200 C orrelation between tibial bone morphology and changes in joint line convergence angle Junya Itou, et al., Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ.…S824 Po-201 E valuation of sports and physical activities in the cases underwent high-tibial osteotomy for knee osteoarthritis Koichi Nakagawa, et al., Dept. of Orthop. Surg., Toho Univ.…S825

Poster Knee 7: OA

Po-202 ＊ M eniscus is extruded not only medially but also anteriorly and meniscus extrusion is associated with cartilage destruction in knee osteoarthritis Adili Arepati, et al., Dept. of Orthop., Juntendo Univ. …S826 Po-203 A ssociation between medial and anterior meniscal extrusion and knee pain in primary stage of knee osteoarthritis Masahiro Momoeda, et al., Dept. of Orthop., Juntendo Univ.…S826 Po-204 A ssessment of lower extremity alignment in osteoarthritis of the knee by difference of radiographic methods Taisei Goto, et al., Dept. of Orthop. Surg., Nihon Univ. Hosp.…S827 Po-205 M eaning of the osteophyte of tibial spine in patients with early knee osteoarthritis Hiroshi Koyama, et al., Dept. of Orthop. Surg., Jyuzen Memorial Hosp.…S827 Po-206 1 0-year differences in joint space width and osteophyte area at knee joints: Comparison of baseline and 4th ROAD study surveys Banri Kitamura, Institute for Health Care Science, Suntory Wellness Ltd.…S828

― 131 ― Po-207 H istological degeneration and macroscopic and imaging evaluation of the anterior and posterior cruciate ligaments in osteoarthritis of the knee Toshihiro Seki, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Hosp.…S828 Po-208 ＊ C linical outcomes of autogenous osteochondral graft for lateral osteoarthritis of the knee Yuki Shinya, et al., Dept. of Orthop., Kyoto Medical Center…S829

Poster Knee 8: Osteonecrosis & general

Po-209 E xamination of exacerbation factors of femoral condyle osteonecrosis by gender Yoichi Ishibashi, et al., Dept. of Orthop. Surg., Kagawa Univ. …S830 Po-210 ＊ R elationship between medial meniscus tear and the size of spontaneous osteonecrosis of the knee Takahiro Fujisawa, Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S830 Po-211 E ffects of teriparatide for spontaneous osteonecrosis of the knee Harehiko Tsukada, et al., Dept. of Orthop. Surg., Aomori City Hosp.…S831 Po-212 C linical outcomes of opening wedge high tibial osteotomy and cartilage repair techniques in patients with spontaneous osteonecrosis of the knee Ken Kumagai, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S831 Po-213 T he effect of lateral wedged insole on medial meniscus degenerative tear is more effective in older and varus alignment patient Kenji Uehara, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S832 Po-214 C linical outcome of the trochlear groove osteochondritis dissecans of the knee patellofemoral joint Toshiya Kano, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S832 Po-215 C linical results for osteochondritis dissecans of the lateral femoral condyle concurrent with a discoid lateral meniscus Ken Iida, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S833

Poster Knee 9: Ligament & general

Po-216 O utcomes of surgical treatment for the multiple knee ligament injuries with both anterior cruciate ligament and posterior cruciate ligament ruptures Zenta Joutoku, et al., Dept. of Orthop. Surg., Hand Center, Obihiro Kosei General Hosp.…S834 Po-217 C ase reports of complex ligamentous injuries with a rectangular retro-dilator Daisuke Kubota, et al., Dept. of Orthop. Surg., Jikei Univ. School of Medicine…S834 Po-218 F actors affecting patients reported outcome after treatment of multiligament knee injuries Yuka Kimura, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S835 Po-219 F actor of failure case in bi-socket knee posterior cruciate ligament reconstruction Takuya Tajima, et al., Div. of Orthop. Surg., Univ. of Miyazaki…S835 Po-220 I nferior popliteomeniscal fascicle is related to lateral meniscus extrusion Takashi Ohsawa, et al., Dept. of Orthop. Surg., Kiryu Orthop. Hosp.…S836 Po-221 C omparison of lower limb alignment measurements in long standing radiograph and hip to calcaneus view Yoshihiro Wanezaki, et al., Dept. of Orthop. Surg., Yamagata Univ. Hosp.…S836

Poster Knee 10: General

Po-222 T he clinical and chondro-protective effects of curcumin internal use for 1 year Yasuaki Nakagawa, et al., Dept. of Orthop., Kyoto Medical Center…S837 Po-223 A study on anatomical morphology and cartilage damage of mediopatellar plica Takenori Omoto, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S837

― 132 ― Po-224 I ssue of Saupe classification in bipartite patella Yoshinori Ohashi, et al., Dept. of Orthop. Surg., Fukui Pref. Hosp.…S838 Po-225 O verlap between the tibia and fibula in the anteroposterior view, defined by the anteroposterior axis of the tibia Hyunho Lee, et al., Dept. of Orthop. Surg., Nihon Univ.…S838 Po-226 M ultimodal analgesia after anterior cruciate ligament reconstruction and high tibial osteotomy: Comparison of intravenous acetaminophen versus combined intravenous acetaminophen and fentanyl Shunichiro Kambara, et al., Dept. of Orthop. Surg., JCHO Kobe Central Hosp.…S839 Po-227 E xploring the factors that affect the efficacy of PRP therapy for knee osteoarthritis Yoshitomo Saita, et al., Dept. of Orthop., Juntendo Univ.…S839 Po-228 R isk factors for knee and heel pain in youth soccer players Toshiyuki Iwame, et al., Dept. of Orthop. Surg., Tokushima Univ. Hosp.…S840

Poster ACL 1

Po-229 ＊ E xamination of factors that increase the pivot shift phenomenon in anterior cruciate ligament injured knee Toshiyuki Ohara, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S841 Po-230 U sefulness of ACL and ALL simultaneous reconstruction for ACL injured knee with grade 3 pivot shift Hiroaki Fukushima, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S841 Po-231 O vertime change of knee instability after ACL/ALL simultaneous reconstruction using quantitative evaluation under general anesthesia Hiroaki Fukushima, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S842 Po-232 C linical outcomes following anatomic double-bundle ACL reconstruction in skeletally mature adolescent patients: Comparison to single-bundle procedure Kanto Nagai, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S842 Po-233 (Canceled) Po-234 F emoral deformity after pediatric anterior cruciate ligament injury: Relationship with bone bruise Mitsuhiro Kimura, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S843 Po-235 T he effect of age on outcomes of remnant preserved ACL augmentation: A multicenter study Tsuyoshi Takada, et al., Dept. of Orthop. Surg., Kure Medical Center and Chugoku Cancer Center …S844

Poster ACL 2

Po-236 A nalysis of the tibial tunnel coalition and location after anatomic double-bundle ACL reconstruction using by a new tibial drill guide Koji Nukuto, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S845 Po-237 T he location of bone tunnel in the rotation of the lower leg during all-inside ACL reconstruction by trans-femoral approach Toshiaki Takahashi, et al., Dept. of Sports and Health Sci., Ehime Univ.…S845 Po-238 T wo-staged revision anterior cruciate ligament reconstruction with an iliac bone graft transplantation Masatake Matsuoka, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S846 Po-239 A ge-related change in semitendinosus muscle tendon Kazuki Asai, Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S846 Po-240 T he relationship of sports activity and graft intensity of MRI in anatomical double bundle ACL reconstruction Takuya Wakatsuki, et al., Dept. of Orthop., Shimane Univ.…S847 Po-241 E valuation of graft maturation after anterior cruciate ligament reconstruction using UTE-MRI Rikuto Yoshimizu, et al., Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S847

― 133 ― Po-242 D eep venous thrombosis after arthroscopic ACL reconstruction or meniscus surgery: Postoperative early screening with soluble fibrin Yoshiyuki Yahagi, et al., Dept. of Orthop. Surg., Nihon Univ. Itabashi Hosp.…S848

Poster ACL 3

Po-243 C linical outcomes of anterior cruciate ligament reconstruction in patients over 40 years: Multicenter study of Hiroshima University Ayato Miyamoto, et al., Dept. of Orthop. Surg., Matsuyama Shimin Hosp.…S849 Po-244 F actors for the limitation of knee extension after anterior cruciate ligament reconstruction Akio Eguchi, et al., Dept. of Orthop. Surg., Matsuyama Red Cross Hosp.…S849 Po-245 I nfra-patella fat pad fibrosis had a detrimental affect on clinical outcomes in anterior cruciate reconstructed patients Ryu Yoshida, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S850 Po-246 P sychological patient-reported outcome measure after ACL reconstruction: Availability of a short version of ACL-RSI scale Youngji Kim, et al., Dept. of Orthop. Surg., Koshigaya Municipal Hosp.…S850 Po-247 ＊ D etailed examination of the effect of meniscus injury associated with the ACL injury knee on knee instability assessment Akiyoshi Mori, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S851 Po-248 C linical outcomes after ACLR combined with medial meniscus posterior root repair in our hospital Yuji Kohno, et al., Dept. of Orthop. Surg., Tokyo Medical and Dental Univ. Hosp.…S851 Po-249 R isk factors related to the presence of meniscal injury and irreparable meniscal tear at primary anterior cruciate ligament reconstruction Tomohiro Tomihara, et al., Dept. of Orthop. Surg., Shimada Hosp.…S852

Poster Sports 1

Po-250 T he characteristics of parents who accept verbal or physical abuse towards children from coaches in youth sports Yutaka Yabe, et al., Dept. of Orthop. Surg., Tohoku Univ. Graduate School of Medicine…S853 Po-251 V erification of whole-body skeletal muscle activity during weightlifting exercise using positron tomography Rikuto Yoshimizu, et al., Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S853 Po-252 I nvestigation of the relationship between femoroacetabular impingement (FAI) cam type and spondylolysis for professional baseball players Genki Iwama, Dept. of Orthop. Surg., Nihon Univ. Hosp.…S854 Po-253 I nvestigation of factors affecting sports participation after total hip arthroplasty Yusuke Osawa, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S854 Po-254 R isk factors for development of sinus tarsi syndrome after acute ankle lateral ligament injury in athletes Futoshi Morio, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S855 Po-255 R elationship between ankle range of motion and throwing-related injury in elementary school baseball players: A prospective study Takuma Kachi, Dept. of Orthop. Surg., Gunma Univ. Graduate School of Medicine…S855 Po-256 I s recovery from fatigue different between female collegiate and recreational athletes?: Drop vertical jump analysis using motion capture system Kengo Harato, et al., Dept. of Orthop. Surg., Keio Univ. …S856

Poster Sports 2

Po-257 ＊ X -ray findings of gymnastʼs wrist Takanobu Nishizuka, et al., Dept. of Orthop. Surg., Chunichi Hosp.…S857

― 134 ― Po-258 R isk factors of nonunion for the coracoid graft in the arthroscopic Bristow & Bankart procedure Takashi Horaguchi, et al., Dept. of Orthop. Surg., Nihon Univ. Hosp.…S857 Po-259 F our-dimensional computed tomography evaluation of shoulder joint contact area in baseball players Daisuke Momma, et al., Center for Sports Medicine Hokkaido Univ. Hosp.…S858 Po-260 A nalysis of clinical findings in osteochondritis dissecans of humeral capitellum with medial epicondyle lesion Keita Kamei, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S858 Po-261 R elationship between elbow ultrasound findings and throwing-related injury in elementary school baseball players: A prospective study Ryosuke Negishi, et al., Dept. of Orthop. Surg., Gunma Univ. Graduate School of Medicine…S859 Po-262 S urgical outcome of a new arthroscopic Bankart repair with knotless suture anchors Keisuke Tsukada, et al., Dept. of Orthop. Surg., Teikyo Univ.…S859

Poster Hand 1: Entrapment neuropathy 1

Po-263 ＊ A ssociation between CSA of the median nerve and in the carpal tunnel electrophysiological severity Atsushi Maeda, et al., Dept. of Orthop. Surg., Fujita Health Univ.…S860 Po-264 M orphological and electrophysiological characteristics of median nerve in unilateral carpal tunnel syndrome patients Yuichi Yoshii, et al., Dept. of Orthop. Surg., Tokyo Medical Univ. Ibaraki Medical Center…S860 Po-265 ＊ M orphological changes in the median nerve after carpal tunnel release by 3D MRI Takuya Funahashi, Dept. of Orthop. Surg., Fujita Health Univ.…S861 Po-266 N ew opponensplasty using extensor indicis muscle and tendon of extensor pollicis brevis Yusuke Matsuura, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S861 Po-267 T he assessment of hand sensory in carpal tunnel syndrome and its relation to the CTSI-JSSH questionnaire Takuya Yokoi, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S862 Po-268 E arly postoperative predictors of clinical outcome following carpal tunnel release Shunpei Hama, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S862

Poster Hand 2: Entrapment neuropathy 2

Po-269 ＊ C linical improvement on the non-operated side in bilateral carpal tunnel syndrome Jiro Kato, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S863 Po-270 C omparison of outcomes of open carpal tunnel open surgery between dialysis patients and non- dialysis patients with carpal tunnel syndrome Madoka Higa, et al., Dept. of Orthop. Surg., Japanese Red Cross Nagoya Daini Hosp.…S863 Po-271 P ostoperative results of carpal tunnel syndrome: Multicenter prospective study Yukinobu Kamiya, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S864 Po-272 T he positive rate of quantitative ring finger splitting in cubital tunnel syndrome Takuya Yokoi, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S864 Po-273 C haracteristics of cubital tunnel syndrome caused by osteoarthritis Takao Omura, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S865 Po-274 D iagnosis of cubital tunnel syndrome using deep learning Atsuyuki Inui, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S865

Poster Hand 3: Degenerative disease 1

Po-275 I nvestigation of functional prognosis of the grip after suspensionplasty with interference screw for thumb carpometacarpal joint osteoarthritis Kazutoshi Hontani, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S866

― 135 ― Po-276 C hanges in the functional range of motion of the thumb MP joint after thumb CM joint arthrodesis Masanori Hayashi, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S866 Po-277 A comparative study of open and arthroscopic arthrodesis for thumb CM osteoarthritis Yasuhiro Ozasa, et al., Dept. of Orthop. Surg., Chitose City Hosp.…S867 Po-278 P ostoperative assessment of suture button suspensionplasty for thumb carpometacarpal arthritis Nana Ichikawa, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S867 Po-279 S uspension arthroplasty with knotless suture anchor for basal thumb arthritis Shinji Tsuchida, et al., Dept. of Orthop., Graduate School of Medical Science, Kyoto Prefectural Univ. of Medicine…S868 Po-280 M acroscopic and imaging study of trigger finger for USSR enforcement Takanori Hatanaka, Dept. of Orthop. Surg., Tokyo Medical Univ.…S868 Po-281 U ltrasonographic assessment of flexor tendon excursion at A1 pulley Yusuke Yuasa, et al., Dept. of Orthop. Surg., Omori Municipal Hosp.…S869 Po-282 D orsal central splitting approach for implant arthroplasty of the PIP joint affected by osteo arthritis Yoshitaka Hamada, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S869

Poster Hand 4: Degenerative disease 2

Po-283 O ne year follow-up after ultrasound-guided treatment with collagenase clostridium histolyticum for Dupuytrenʼs disease Rikuo Shinomiya, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S870 Po-284 C linical results of capsulodesis with dorsal intercarpal ligament for chronic scapholunate dissociation Hiroki Shibayama, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S870 Po-285 C ore excision and tendon ball implantation for the treatment of advanced stage Kienböckʼs disease Maya Tokumoto, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S871 Po-286 B one morphology in the idiopathic ulnar impaction syndrome Hirotaka Okubo, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S871 Po-287 P ost-operative elongation of interlacing suture in combination with a core suture Yasunari Toguchi, et al., Dept. of Orthop. Surg., Chiba Univ. Hosp.…S872 Po-288 S tudy on stability of total elbow arthroplasty: A cadaver study Hiromasa Wakita, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S872 Po-289 R elation between clinical results of radial/focused ESWT in refractory lateral epicondylitis and change of MRI of ECRB enthesis after ESWT Daisuke Kajiwara, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S873 Po-290 C linical outcomes for platelet-rich plasma therapies in medial or lateral epicondylitis of elbows Mamoru Yoshida, et al., Dept. of Orthop. Surg., National Hosp. Organization Nishisaitama-Chuo Hosp.…S873

Poster Basic research 1: Lower limb

Po-291 ＊ E stablishment of a novel acetabular dysplasia classification based on the normal vector of the acetabular rim surface Tohru Irie, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S874 Po-292 M easurement of initial extraction force of a cemented, polished, tapered femoral implant Fumio Sasazawa, et al., Dept. of Orthop. Surg., Hakodate Central General Hosp.…S874 Po-293 C orrelation between cortical thickness and bowing of the femoral diaphysis in healthy elderly people Keiichiro Someya, et al., Dept. of Orthop. Surg., Niigata Prefectural Central Hosp.…S875 Po-294 R elationship between in vivo kinematics after TKA and installation position Kengo Sakakura, et al., Dept. of Orthop. Surg., Kyorin Univ. …S875

― 136 ― Po-295 D evelopment of magnetic field device for cellular magnetic targeting for knee joint cartilage regeneration Naosuke Kamei, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S876 Po-296 W hat is a factor correlated with the patellar size?: Evaluation of a related factor using the knee MR Moritaka Maruyama, et al., Dept. of Orthop. Surg., Iwate Medical Univ. …S876 Po-297 C urvature-based surface quantification of cartilage degradation using 3D-scanning method Masanari Hamasaki, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S877 Po-298 A ccuracy of automated analysis of 3D dynamics of ankle joints using deep learning and 2D-3D registration Takuma Miyamoto, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S877

Poster Basic research 2: Upper limb & trunk

Po-299 M orphological characteristics of the scapula in patients with rotator cuff tears: 3-dimensional analysis of the whole shape using homologous modelling Ryo Tokita, et al., Dept. of Physical Therapy, School of Health Sciences, Sapporo Medical Univ.…S878 Po-300 E valuation of the instability in neck-shaft angle and subscapularis repair in the on-lay type of RSA using fresh frozen cadaver Yohei Shimada, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S878 Po-301 I nvestigation of pressure between the bone fragment after tension band wiring technique for olecranon osteotomy using finite element method Akitoshi Sakuma, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S879 Po-302 I nvolvement of thrombin in the differentiation into myofibroblast in fibrous cord of Dupuytrenʼs disease Jiro Kato, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S879 Po-303 D ynamic analysis of triangular fibrocartilage complex by using ultrasonography images Issei Shinohara, et al., Dept. of Orthop. Surg., Kobe Univ. Hosp.…S880 Po-304 E ffect of body shape and lumbar pelvic alignment on initial position of seatbelt Hiroki Yamagata, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S880

Poster Basic research 3: Tissue regeneration

Po-305 A n inflammasome adaptor protein ASC deletion enhances functional recovery after spinal cord injury in mice Yasuyuki Shiraishi, et al., Dept. of Orthop., Jichi Medical Univ.…S881 Po-306 M icrovascular blood flow assessment of chronic sciatic nerve compression in a mouse model by fluorescein angiography Shunpei Hama, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S881 Po-307 ＊ N eutrophil migration after peripheral nerve injury: The relation between spatiotemporal change and blood nerve barrier Yasuhiro Yamamoto, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S882 Po-308 C omparative study of osteogenic potential in dedifferentiated fat cells (DFAT) Hirokatsu Sawada, et al., Dept. of Orthop. Surg., Nihon Univ. Itabashi Hosp.…S882 Po-309 E valuation of quercetin in vitro for high glucose induced oxidative stress on tenocytes Tomoya Yoshikawa, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S883 Po-310 A n optimal platelets concentration in PRP for a pain relief and a restoration in the treatment of tendinopathies Mamoru Yoshida, et al., Dept. of Orthop. Surg., National Hosp. Organization Nishisaitama-Chuo Hosp.…S883 Po-311 E valuation of dehydroepiandrosterone in vitro and in vivo for high glucose-induced oxidative stress on tenocytes Shintaro Mukohara, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S884

― 137 ― Poster Basic research 4: Tumor

Po-312 D evelopment of oncolytic virus incorporating tumor-suppressor microRNA Tomohiko Sakuda, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S885 Po-313 T he antitumor effect for HT1080 and MG63 by NF-κB inhibitor SEMBL with DOX or PTX Katsuhisa Kawanami, et al., Dept. of Orthop. Surg., Aichi Medical Univ., School of Medicine…S885 Po-314 P romising abscopal effect of combination therapy with thermal tumour ablation and intratumoural OK-432 injection in the rat osteosarcoma model Tadashi Iwai, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S886 Po-315 T he combined administration of plasma-activated infusion and salinomycin has a potent and tumor- specific anticancer activity in vitro and in vivo Takashi Ando, et al., Dept. of Orthop. Surg., Graduate School of Medical Science, Univ. of Yamanashi…S886 Po-316 ＊ P roteomics identified novel prognostic proteins in malignant peripheral nerve sheath tumor Ryuto Tsuchiya, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S887

Poster Tumor 1: Malignant bone tumor

Po-317 C linical and radiographic outcomes of tumor modular endoprosthesis with cemented stem fixation after resection of a femoral malignant bone tumor Yusuke Aoki, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S888 Po-318 A nalysis of infection control rate of postoperative infection in tumor endoprosthesis Tomoka Takagi, et al., Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S888 Po-319 C linical outcome of extra-axial chordoma: An Integrative data analysis Toshihiko Nishisho, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S889 Po-320 C linical outcome in patients with dermatofibrosarcoma protuberance: Report from bone and soft tissue tumor registry in Japan Tomoki Nakamura, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S889 Po-321 B one sarcomas in elderly patients: An interim report of JMOG study Akihito Nagano, et al., Dept. of Orthop. Surg., Div. of Disease Control, Research Field of Medical Sciences, Graduate School of Medicine, Gifu Univ.…S890 Po-322 T umor-induced osteomalacia: A case report Jun Fujimori, et al., Dept. of Orthop. Surg., Kure Medical Center and Chugoku Cancer Center …S890 Po-323 T he number of osteoclasts in a biopsy specimen can predict the efficacy of neoadjuvant chemotherapy for primary osteosarcoma Yoshihiro Araki, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S891 Po-324 The efficacy of ADC map for the treatment outcome in patients with osteosarcoma Hiroshi Koike, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S891

Poster Tumor 2: Malignant soft tissue tumor 1

Po-325 ＊ C linical outcome of amputation for extremity in patients with soft tissue sarcoma: Tokai musculoskeletal oncology consortium study Tomohito Hagi, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S892 Po-326 ＊ A ssociation between delay of radical surgery and prognosis after unplanned excision of soft tissue sarcomas Shusa Ohshika, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S892 Po-327 C linical outcome and prognostic factor analysis of the patients with unplanned excisions Sei Morinaga, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S893

― 138 ― Po-328 C linical survey for soft tissue sarcoma patients received unplanned excision in the western part of Kanagawa prefecture Yoshikazu Tanzawa, et al., Dept. of Orthop. Surg., Tokai Univ.…S893 Po-329 I mpact of acridine orange in patients with local recurrence soft tissue sarcoma Hiroyuki Tsuchie, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S894 Po-330 E xtent of resection for good postoperative results in the adductor compartment of the thigh Atsushi Tanaka, et al., Dept. of Rehabilitation Medicine, Shinshu Univ.…S894 Po-331 R isk factors associated with postoperative complications in soft tissue sarcoma surgery Takatsugu Fujibuchi, Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S895 Po-332 C linical outcomes of wide excision alone for elderly patients with soft tissue sarcoma Yusuke Aoki, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S895

Poster Tumor 3: Malignant soft tissue tumor 2

Po-333 A nalysis of soft tissue sarcoma of the elbow: Report using the bone and soft tissue tumor registry in Japan Makoto Emori, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S896 Po-334 P rognostic significance of histological subtype in soft tissue sarcoma with distant metastasis Hiroyuki Tsuchie, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S896 Po-335 P rognostic influence of the treatment approach for pulmonary metastasis in patients with soft tissue sarcoma Teruya Kawamoto, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S897 Po-336 N utritional assessment tools in predicting prognosis of patients with soft tissue tumor Hiromi Sasaki, Dept. of Orthop. Surg., Graduate School of Medical and Dental Sciences, Kagoshima Univ.…S897 Po-337 C linical features and prognosis of advanced soft tissue sarcomas with developed metastasis Kayo Suzuki, et al., Dept. of Orthop. Surg., Univ. of Toyama…S898 Po-338 P reoperative venous thromboembolism in patients with malignant musculoskeletal tumor Kenta Hayashida, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S898 Po-339 C linical course of desmoid-type fibromatosis in long-term treatment with tranilast Masanobu Takeyama, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S899

Poster Tumor 4: Malignant soft tissue tumor 3

Po-340 C linical implication of surface temperature changes associated with soft tissue tumors Akiyoshi Shimatani, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S900 Po-341 P reoperative imaging of lipomatous tumor with 18-F fludeoxyglucose positron emission tomography Yasunori Tome, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S900 Po-342 T he analysis of MRI and immunohistochemical findings in patients with de-differentiated liposarcoma Keisuke Yoshida, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S901 Po-343 P reserving the posterior cortex of the strum in the resection of radiation induced chest wall sarcoma Akio Sakamoto, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S901 Po-344 ＊ W as the pedicled flaps the first choice for soft tissue reconstruction tumor after malignant tumor resection? Mitsuhiro Okada, et al., Dept. of Orthop. Surg., Osaka City Univ. Hosp.…S902

― 139 ― Po-345 D eveloping a comprehensive scoring system combining radiological and histopathological examinations for differential diagnosis of between benign and intermediate adipocytic tumors Yohei Asano, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S902 Po-346 T reatment for epithelioid MPNST Keiko Hayakawa, et al., Dept. of Orthop. Surg., Cancer Institute Hosp. of JFCR…S903

Poster Tumor 5: Benign tumor

Po-347 C linical outcomes for unidirectional porous tricalcium phosphate applied to bone defects after resection of bone tumor: A prospective multi-institutional study Kunihiro Ikuta, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S904 Po-348 S urgical outcome of enchondroma of the short bones using original curettage and high-pressure cleaning tool Eiji Osaka, et al., Dept. of Orthop. Surg., Nihon Univ.…S904 Po-349 O steochondromas located at proximal femur causes hip deformity and acetabular dysplasia Yoji Shido, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S905 Po-350 S tructural origin and surgical complications of peripheral schwannomas Hirotaka Yonezawa, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S905 Po-351 C orrelation of imaging studies to clinical and histological findings in patients with synovial chondromatosis Michiro Susa, et al., Dept. of Orthop. Surg., National Defense Medical College…S906 Po-352 T he efficacy and problems of chemical adjuvant therapy using liquid nitrogen after curettage of aggressive bone tumor Takuya Watanabe , et al., Dept. of Orthop. Surg., Tokai Univ.…S906 Po-353 S urgical margin for phosphaturic mesenchymal tumors in soft tissues: An analysis of the radiological-histopathological correlation Hiroshi Kobayashi, et al., Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S907

Poster Tumor 6: Metastatic bone tumor & general

Po-354 C linical study of bone metastasis in prostate cancer according to degree of histological malignancy Tamon Asano, et al., Dept. of Orthop. Surg., Yamagata Prefectural Central Hosp.…S908 Po-355 T hiamine deficiency and delirium among patients undergoing surgery for bone metastases Jungo Imanishi, et al., Dept. of Orthop. Oncology and Surg., Saitama International Medical Center, Saitama Medical Univ.…S908 Po-356 A djuvant chemotherapy with doxorubicin and ifosfamide, and proton beam therapy for paravertebral myoepithelial carcinoma: A case report Shunichi Toki, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S909 Po-357 T he impact of sarcopenia on treatment for malignant bone and soft tissue tumor in single Japanese institution Yoshitaka Ban, Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S909 Po-358 A case study of suspected aortitis due to pegfilgrastim during chemotherapy at our hospital Tomohiko Sakuda, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S910 Po-359 S kin color and tumor color of soft tissue tumor Naoto Oebisu, Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S910 Po-360 C linical characteristics of the patients with primary malignant bone tumors of spine: Comparison with primary malignant bone tumors of limbs Kensaku Yamaga, et al., Dept. of Orthop. Surg., Tottori Univ.…S911

― 140 ― Poster Pain 1

Po-361 R elationship between central sensitization and motor pain in the general population: Wakayama health promotion study Shingo Inoue, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S912 Po-362 T he definition of central sensitization using new cutoff value in central sensitization inventory in health checkup Shiro Imagama, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S912 Po-363 I nvolvement of central sensitivity in chronic low back pain: Population-based cohort study Koji Akeda, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S913 Po-364 ＊ A nalgesic usage in spinal out-patients with central sensitization to pain Hiroki Ushirozako, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S913 Po-365 H istory of central sensitization syndrome is important Koichiro Ide, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S914 Po-366 P reoperative central sensitization is not associated with preoperative pain and satisfaction after TKA Takuya Iseki, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S914

Poster Pain 2

Po-367 C o-administration of an NSAIDs and tramadol/acetaminophen tablets for analgesia after arthroscopic rotator cuff repair Shugo Maeda, Dept. of Orthop. Surg., Aomori Rosai Hosp.…S915 Po-368 A nalgesic effect of different volume of dexamethasone addition for arthroscopic shoulder surgery under interscalene brachial plexus block Teiichi Sano, et al., Dept. of Orthop. Surg., Shizuoka General Hosp.…S915 Po-369 R andomized control trial for the postoperative pain in the day surgery Hidenori Kondo, et al., Dept. of Orthop. Surg., Okayama Saiseikai General Hosp.…S916 Po-370 L ateral wedge insole for osteoarthritis of the knee is more effective in elderly patients Takaaki Kudo, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S916 Po-371 I nvestigating the agents concentration in tissues after administration of Esflurbiprofen tape and flurbiprofen in knee osteoarthritis patients: Multi-centered randomized study Masaki Amemiya, et al., Dept. of Joint Surg. and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental Univ.…S917 Po-372 T he efficacy of duloxetine for chronic low back pain with spinal sagittal malalignment in osteoporosis patients Sho Inoue, Dept. of Orthop. Surg., Kitasato Univ.…S917

Poster Pain 3

Po-373 T he prevalence of neck and shoulder pain in a middle-aged community-living population: Impact on health related quality of life Masaaki Machino, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S918 Po-374 ＊ B ody composition analysis in elderly patients with non-specific chronic pain Yoshihito Sakai, et al., Dept. of Orthop. Surg., National Center for Geriatrics and Gerontology…S918 TM Po-375 R eliability and usefulness of QuantiPain for evaluating pain sensitization Yoshihiro Hayashi, et al., Rehabilitation Center, Kochi Medical School Hosp.…S919 Po-376 ＊ S elf-efficacy influences caregiver burden in chronic pain patients Hironori Tsuji, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S919 Po-377 G oogling musculoskeletal related pain and ranking of medical associationsʼ patient information pages: Google Ads Keyword Analysis Yoichiro Yamaguchi, et al., Div. of Orthop. Surg., Univ. of Miyazaki…S920

― 141 ― Poster Musculoskeletal rehabilitation 1: Lower leg 1

Po-378 ＊ T he factors contributing to the improvement of GLFS25 score including patients with joint arthroplasty Tsuyoshi Watanabe, et al., Dept. of Orthop. Surg., National Center for Geriatrics and Gerontology…S921 Po-379 T rends in patient-reported outcome measures and performance-based outcome measures for three years after total knee arthroplasty in elderly patients Tatsuo Kato, et al., Dept. of Orthop. Surg., Steel Memorial Hirohata Hosp.…S921 Po-380 I mprovement of locomotive syndrome by surgical treatment in patient with degenerative disease in the lumbar spine and lower extremities Yoshiyuki Okamoto, et al., Dept. of Orthop. Surg., Yawata Medical Center…S922 Po-381 I mprovement of locomotive syndrome after total hip arthroplasty Naofumi Taniguchi, et al., Dept. of Rehabilitation Medicine, Graduate School of Medical Science, Univ. of Yamanashi…S922 Po-382 R elationship between locomotive syndrome and total hip arthroplasty Takaaki Ohmori, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S923 Po-383 S arcopenia index reflects walking ability in patients with hip fracture Naoki Okubo, et al., North Medical Center, Kyoto Prefectural Univ. of Medicine…S923 Po-384 R elationship between oral energy intake and outcome at discharge in patients with postoperative hip fracture Yoshiaki Morinaga, Dept. of Orthop. Surg., Kensei Hosp.…S924

Poster Musculoskeletal rehabilitation 2: Lower leg 2

Po-385 ＊ P rogression of hip deformity changes affects exacerbation of locomotive syndrome Yuta Shimizu, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S925 Po-386 ＊ R elationship between locomotive syndrome and early knee osteoarthritis in Japanese general population Shizuka Sasaki, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S925 Po-387 V erification of phycological factors related to health-related quality of life in elderly knee osteoarthritis: A prospective cohort study Takako Nagai, et al., Dept. of Orthop. Surg., Nihon Univ.…S926 Po-388 T he effect of surgery on osteoarthritis of ankle joint and hallux valgus for locomotive syndrome Kanu Shimokawa, Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S926 Po-389 T reatment options for osteoarthritis of the ankle: Distinguish between brace treatment and total ankle arthroplasty properly Yui Akiyama, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S927 Po-390 Q uadriceps strength to body weight ratio is a significant indicator for initiating jogging after anterior cruciate ligament reconstruction Toshiyuki Iwame, et al., Dept. of Orthop. Surg., Tokushima Univ. Hosp.…S927

Poster Musculoskeletal rehabilitation 3: Locomotive syndrome 1

Po-391 ＊ I f the grip strength and the standing time are less, the fall risk is high and the SMI is low Shizuka Ozawa, Dept. of Orthop. Surg., Showa Univ.…S928 Po-392 M aximum grip strength and maximum one leg standing time with eye open are useful for flail prediction Takashi Nagai, et al., Dept. of Orthop. Surg., Showa Univ.…S928 Po-393 C an the loco-check be used as a self-check tool for evaluating fall risk among older subjects?: A prospective study Hideki Shigematsu, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S929 Po-394 ＊ T he 5-question geriatric locomotive function scale predicts postoperative fall risk in patients undergoing surgery for degenerative cervical myelopathy Atsushi Kimura, et al., Dept. of Orthop., Jichi Medical Univ.…S929

― 142 ― Po-395 ＊ C haracteristics of trunk sway during walking of women with fall history using an accelerometer Azusa Kayamoto, Dept. of Rehabilitation, Nagoya Univ. Hosp.…S930 Po-396 I mprovement of the sagittal alignment of the spine and standing balance by “locomotion training” exercises in patients with “locomotive syndrome” Takashi Yurube, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S930 Po-397 I ntervention effects of exercise Instruction for prevention of musculoskeletal disorders in the local elderly residents Yuh Watanabe, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S931

Poster Musculoskeletal rehabilitation 4: Locomotive syndrome 2

Po-398 C linical evaluation of sit-to-stand postural transfer assistance of Qolo for complete paraplegia due to spinal cord injury Yukiyo Shimizu, et al., Dept. of Rehabilitation Medicine, Univ. of Tsukuba…S932 Po-399 J apanese community-dwelling survey of nutrition intake and diet in cases with sarcopenia Risa Sakai, et al., Dept. of Orthop. Surg., Nagoya Univ. Hosp.…S932 Po-400 M etabolic syndrome in female is a factor associated with locomotive syndrome stage 2: The Yakumo study Shunsuke Kanbara, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S933 Po-401 P revalence and associated factors of low back pain and locomotive syndrome in diabetic patients Makoto Handa, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S933 Po-402 T he prevalence and characteristics of locomotive syndrome in chronic pain patients Hironori Tsuji, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S934 Po-403 R elationship between self-efficacy and chronic musculoskeletal pain or locomotive syndrome Koji Otani, et al., Dept. of Orthop. Surg., Fukushima Medical Univ.…S934 Po-404 R elationship between locomotive syndrome and number of baths Takashi Nagai, et al., Dept. of Orthop. Surg., Showa Univ.…S935

Poster Musculoskeletal rehabilitation 5: Locomotive syndrome 3

Po-405 R elationship of frequency of participation in a physical checkup and physical performance in middle-aged and elderly people: The Yakumo study Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S936 Po-406 ＊ S tudy of osteosarcopenia and its relation to physical performance Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S936 Po-407 P hysical performance reflects cognitive function, fall risk, and QOL in the community-dwelling older people Shota Ikegami, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S937 Po-408 L imb muscle balance in locomotive syndrome Sadayuki Ito, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S937 Po-409 L ocomotive syndrome overlapped majority of frailty and sarcopenia Koichiro Ide, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S938 Po-410 R elationship between flail and upper limb function of community-living elderly: Relationship between flail and upper limb function of community-dwelling elderly Takuya Yoda, Div. of Comprehensive Musculoskeletal Medicine, Niigata Univ.…S938 Po-411 E valuation of frailty and social activities in patients with lumbar spinal canal stenosis Kenichi Kawaguchi, et al., Dept. of Orthop. Surg., Kyushu Univ. Hosp.…S939

― 143 ― Poster THA 1: Imaging 1

Po-412 ＊ I nvestigation of tapered wedge stem alignment using femoral elevate device in DAA-THA Masamichi Onaga, et al., Orthop. Surg., Univ. of the Ryukyus Hosp.…S940 Po-413 ＊ S tress analysis of total hip arthroplasty with full hydroxyapatite coated stem: Comparison with thermoelastic stress analysis and finite element analysis Ryunosuke Watanabe, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S940 Po-414 I nfluencing factors for liner-neck distance during squatting motion after total hip arthroplasty Satoru Harada, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S941 Po-415 C orrelation between changes in bone mineral density around short tapered-wedge stems and the stem alignment measured by 3D templating software Sho Masuda, et al., Dept. of Orthop. Surg., Shiraniwa Hosp.…S941 Po-416 N ew evaluation method of the bone formation around the full HA compaction stem using tomosynthesis Sho Totsuka, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S942 Po-417 E ffect of difference in head diameter on cortical hypertrophy after insertion of cementless stem Seiya Ishii, et al., Dept. of Orthop., Juntendo Univ. …S942 Po-418 F ive-years follow up of total hip arthroplasty with HA coated CORAIL stem: Characteristic X-ray changes Yoko Miura, Funabashi Orthop. Hosp.…S943

Poster THA 2: Imaging 2

Po-419 ＊ W ear analysis of the 1st generation crosslinked PE at minimum 10 years follow-up Satoru Harada, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S944 Po-420 A safe direction of reaming of total hip arthroplasty; An investigation in the developmental disorder of the hip Masashi Ishida, et al., Dept. of Orthop. Surg., Kyoto Pref. Rehabilitation Hosp. for Disorder of Mental and Physiology …S944 Po-421 A ssociations between pelvic incidence and sagittal alignment of the spine between standing and sitting position in total hip arthroplasty patients Hiroyuki Ike, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S945 Po-422 T hree-dimensional computer analysis of the acetabular cup of total hip arthroplasty for the patients with Crowe IVb Masaya Ueno, et al., Dept. of Orthop. Surg., Saga Univ.…S945 Po-423 E valuation of the axial cup position of CT by different approaches in THA Shuro Furuichi, Dept. of Bone and Joint Surg., Kawasaki Medical School…S946 Po-424 S pinal alignment changes before and after total hip arthroplasty are affected by the underlying disease Satoshi Ochiai, et al., Dept. of Orthop. Surg., Nagoya Univ. Hosp.…S946 Po-425 A re ilioischial line and tear drop useful as indicators for cup placement in total hip arthroplasty? Hatsumi Ichinose, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S947

Poster THA 3: Navigation & intraoperative support

Po-426 A ccuracy comparison of HipAlign lateral position and HipAlign new lateral Joji Miyawaki, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S948 Po-427 A ccuracy of acetabular cup placement in total hip arthroplasty for osteoarthritis using an image-free navigation Yohei Naito, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S948 Po-428 C up positioning and dislocation rate in total hip arthroplasty using a laser-guided technique Yusuke Kohno, et al., Dept. of Orthop. Surg., JCHO Kyushu Hosp.…S949 Po-429 U tility of intraoperative support device hip grid in DAA THA Kazuo Tomizawa, et al., Dept. of Orthop. Surg., Dokkyo Medical Univ. …S949

― 144 ― Po-430 Z -type alignment guide for functional pelvic plane in total hip arthroplasty in the lateral decubitus position Kazuya Makida, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S950 Po-431 E valuation of stem anteversion during total hip arthroplasty: Accuracy of integrated angle meter Masahiro Miyano, et al., Dept. of Orthop. Surg., Hakodate Central General Hosp.…S950 Po-432 A ccuracy of imageless navigation versus CT-based navigation acetabular cup implantation after total hip arthroplasty Toshio Yamaguchi, Dept. of Orthop. Surg., Mie Chuo Medical Center…S951 Po-433 T he accuracy of acetabular component positioning in computer navigated total hip arthroplasty using the direct superior approach Hiroshi Watanabe, et al., Dept. of Orthop. Surg., Nippon Medical School Musashikosugi Hosp.…S951

Poster THA 4: Outcome 1

Po-434 E valuation of factors correlating with patient's reported outcome after total hip arthroplasty in elderly and non-elderly patients Takanori Miura, et al., Dept. of Orthop. Surg., Kakunodate General Hosp.…S952 Po-435 L ong term results of the second generation metal-on-metal total hip arthroplasty Hiroyuki Matsuya, et al., Dept. of Orthop. Surg., Kansai Medical Univ. Medical Center…S952 Po-436 A result of primary THA with Kerboull-Tanaka reinforcement plate for severely acetabular bone defect Shuhei Nabatame, et al., Dept. of Orthop. Surg., Matsudo City General Hosp.…S953 Po-437 S hort term results of direct anterior approach with polished taper stem Takuma Kato, et al., Dept. of Orthop. Surg., Kushiro Rosai Hosp.…S953 Po-438 S hort term result of rectangular curved short stem via anterolateral supine MIS approach Yutaro Munakata, Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ.…S954 Po-439 O utcome of total hip arthroplasty using direct anterior and posterior approach: More than 5-year follow-up Takahito Yuasa, et al., Dept. of Orthop. Surg., Juntendo Univ. Urayasu Hosp.…S954 Po-440 R esults with a constrained acetabular liner in patients at high risk of dislocation after total hip arthroplasty Kenji Tateda, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S955 Po-441 T he comparison of postoperative 5-year PROMs (WOMAC score) between THA patient and TKA patient Shingo Maeda, et al., Dept. of Orthop. Surg., Shiraniwa Hosp.…S955

Poster THA 5: Outcome 2

Po-442 L ong-term results of revision hip arthroplasty with titanium fully porous long stem Masahiro Hasegawa, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S956 Po-443 T he over fifteen years survivorship and radiographic finding of the cementless cup that fixed using line-to-line technique and screw fixation Eiji Takahashi, Dept. of Orthop. Surg., Kanazawa Medical Univ.…S956 Po-444 T he long term clinical and radiographic results of total hip arthroplasty using S-ROM-A Stem: Minimal 10-year follow up Yohei Matsushita, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S957 Po-445 L ong term results of total hip arthroplasty with using SROM femoral stem Ken Iwata, et al., Dept. of Orthop. Surg., Kagawa Univ. …S957 Po-446 M iddle term results of total hip arthroplasty for rapidly destructive coxarthropathy Hideki Saka, Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S958 Po-447 M id-term results of hybrid total hip arthroplasty performed by OCM approach Kaname Takahashi, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S958 Po-448 A long-term clinical result in total hip arthroplasty: Comparison between Charnley Elite plus and C-stem Shota Nakagawa, et al., Dept. of Orthop. Surg., Mito Medical Center…S959

― 145 ― Poster THA 6: Complication & Revision

Po-449 ＊ M otor nerve palsy following total hip arthroplasty Hiroharu Oki, et al., Dept. of Orthop. Surg., Yamagata Saisei Hosp.…S960 Po-450 T he management of severe acetabular bone loss using Kerboull-type acetabular reinforcement devices Naohiko Mashima, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S960 Po-451 R evision THA for trunnionosis with elevated blood cobalt ion after metal-on-polyethylene THA Takahiro Morikawa, et al., Dept. of Orthop., Juntendo Univ. …S961 Po-452 C linical effects of combined anteversion and offset on dislocation after total hip arthroplasty Kenta Matsuda, et al., Dept. of Orthop. Surg., Teikyo Univ.…S961 Po-453 A trophy of muscles around hip joint increases the dislocation risk in cases with revision total hip arthroplasty Shinya Tsujiku, et al., Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S962 Po-454 F emoral nerve palsy following total hip arthroplasty with the direct anterior approach Yoshiatsu Nakakita, et al., Funabashi Orthop. Hosp.…S962 Po-455 U sage results of dual mobility cup in anterior-lateral supine approach Hiroki Kobayashi, et al., Dept. of Orthop. Surg., National Defense Medical College…S963

Poster THA 7: General

Po-456 ＊ T he patients with CRP positive on preoperative examination of total hip arthroplasty Kan Sasaki, et al., Dept. of Orthop. Surg., Yamagata Saisei Hosp.…S964 Po-457 ＊ C omparison of distance measured with 3DCT and intraioperative for intermuscular septum position of the fascia latae and gluteus medius muscles Yuki Ota, et al., Dept. of Orthop. Surg., Asa Citizens Hosp.…S964 Po-458 F ollow up rate after total hip arthroplasty and efforts to encourage revisit Ryosuke Momma, et al., Dept. of Orthop. Surg., Yamagata Univ.…S965 Po-459 S elf-efficacy and total hip arthroplasty: Factor affecting patientsʼ QOL after THA Taisuke Seki, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S965 Po-460 T he effect of vertical band on leg lengthening in total hip arthroplasty Hiroyuki Watanabe, et al., Dept. of Orthop. Surg., Kumamoto City Hosp.…S966 Po-461 H ip flexion contracture Satoshi Kamihata, Dept. of Orthop. Medical Engineering, Graduate School of Medicine, Osaka Univ.…S966 Po-462 A ssociation of ABO blood group with intraoperative bleeding and hidden blood loss in patients undergoing total hip arthroplasty Katsuhiko Maezawa, et al., Dept. of Orthop. Surg., Juntendo Univ. Urayasu Hosp.…S967 Po-463 C omparison of morphological changes in peri-joint muscles after total hip arthroplasty via modified Watson-Jones and posterior approaches Atsushi Taninaka, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S967

Poster Hip 1: Osteonecrosis

Po-464 ＊ E ffect of stress concentration in the boundary on the collapsed lesion: Mechanism of collapse in osteonecrosis of the femoral head Koichiro Kawano, et al., Dept. of Orthop. Surg., Clinical Medicine, Graduate School of Medical Sciences, Kyushu Univ.…S968 Po-465 W hole-body multi-modality evaluations for diagnosis of multifocal osteonecrosis: Pilot study Shunichi Yokota, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S968

― 146 ― Po-466 R elationship between trabecular bone structure and progression of stage in idiopathic osteonecrosis of the femoral head Tadashi Inoue, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Science, Hiroshima Univ.…S969 Po-467 T he evaluation of hip cartilage degeneration with osteonecrosis of the femoral head by MRI T2 mapping Tadashi Inoue, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Science, Hiroshima Univ.…S969 Po-468 F actors associated for the change of steroid-related osteonecrosis of the femoral head Ima Kosukegawa, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S970 Po-469 A utologous concentrated bone marrow transplantation using a point-of-care device for idiopathic osteonecrosis of the femoral head Yasuhiro Homma, et al., Dept. of Orthop., Juntendo Univ. …S970 Po-470 C linical outcomes of transtrochanteric curved varus osteotomy for idiopathic osteonecrosis of the femoral head Yusuke Horita, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S971

Poster Hip 2: Preservation surgery 1

Po-471 A nalysis of the three-dimensional shift of the femoral head before and after rotational acetabular osteotomy using computed tomography images Tomonori Tetsunaga, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S972 Po-472 L ongitudinal evaluation of stress distribution in eccentric rotational acetabular osteotomy Yumejiro Nakamura, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S972 Po-473 R elationship among X-ray evaluation and hip instability after rotational acetabular osteotomy Yusuke Fujiwara, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S973 Po-474 J oint instability after eccentric rotational osteotomy Fumiya Kizawa, et al., Hokkaido Univ. Hosp.…S973 Po-475 T reatment outcomes of borderline developmental dysplasia of the hip: Pelvic osteotomy or hip arthroscopic surgery? Hideki Fujii, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S974 Po-476 C ongruency of the hip and middle term results of RAO Shunji Nakano, et al., Dept. of Orthop. Surg., Tokushima Municipal Hosp.…S974 Po-477 T he short term result of periacetabular osteotomy (CPO) following hip arthroscopy, and its correlation with arthroscopic findings Koji Goto, Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S975

Poster Hip 3: Preservation surgery 2

Po-478 C omputed navigation guidance for eccentric rotational acetabular osteotomy Takahiro Negayama, et al., Dept. of Orthop. Surg., Kagawa Univ. …S976 Po-479 C hange in range of motion following shelf arthroplasty against developmental dysplasia of the hip Yohei Yukizawa, et al., Dept. of Orthop. Surg., Yokohama City Univ. Medical Center…S976 Po-480 P atient satisfaction after periacetabular osteotomy versus total hip arthroplasty on developmental dysplasia of the hip Tetsunari Harada, Dept. of Orthop. Surg., Kyushu Univ. Hosp.…S977 Po-481 S tudy of lumbar degeneration in hip arthroscopy Kei Tamura, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S977 Po-482 R elationship between displacement of the femoral head before and after acetabular rotation osteotomy and contact pressure using finite element analysis Arata Kanaizumi, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S978 Po-483 R elationship between osteotomy line and femoral neck anteversion in transtrochanteric curved varus osteotomy Soutarou Izumi, et al., Dept. of Orthop. Surg., Hiroshima Prefectural Rehabilitation Center …S978

― 147 ― Po-484 D evelopment of PSI (bone cutting guide) for curved periacetabular osteotomy using 3D printer Hideo Takata, et al., Dept. of Orthop. Surg., Toyama Prefectural Rehabilitation Hosp. & Support Center for Children with Disabilities…S979

Poster Hip 4: General

Po-485 E valuation of the interaction between subchondral bone microstructure and clinical symptoms in hip osteoarthritis Yuichi Kato, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Science, Hiroshima Univ.…S980 Po-486 U ltrasound findings indicating the tendinosis at the origin of the direct head of the rectus femoris and their interpretation Masashi Fujii, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S980 Po-487 G lobal spinal alignment and blood laboratory data in patients with rapidly destructive coxarthrosis Yaichiro Okuzu, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S981 Po-488 T he relationship between the radiographic parameters and the dynamic instability in hip dysplasia - analysis with computer: Assisted image matching procedure Hiroshi Imai, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S981 Po-489 E valuation of hip instability and iliaofemoral ligament in borderline hypoplasia of the hip Yusuke Fujiwara, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S982 Po-490 T he relationship between subchondral bone microstructure and progression of hip osteoarthritis Yuichi Kato, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Science, Hiroshima Univ.…S982 Po-491 T he effects of three-dimensional pelvic dynamics on hip range of motion in cam type FAI: A computer simulation analysis Hideki Honda, et al., Dept. of Orthop. Surg., Yokohama City Univ. Medical Center…S983 Po-492 E xamination of sex differences in hip pain and disability Yasuhiko Takegami, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S983

Poster Spine 1: Cervical spine 1

Po-493 A bnormalities of the vertebral artery subsequent to spinal degeneration and aging: Evidence to avoid intraoperative vertebral artery injury or occlusion Takashi Ohnishi, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S984 Po-494 I nfluence of cage property on bony union in anterior cervical intervertebral fusion Yohei Ito, et al., Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S984 Po-495 M iddle term surgical results of anterior cervical discectomy and fusion using an anchored cage Akihito Wada, et al., Dept. of Orthop. Surg., Toho Univ.…S985 Po-496 A ccuracy of cervical pedicle screw insertion using syringe technique with lateral skin incision Tomoto Suzuki, et al., Dept. of Orthop. Surg., Yamagata Univ.…S985 Po-497 A ccuracy of posterior cervical pedicle screw insertion using O-arm based navigation system Keiji Wada, et al., Dept. of Orthop. Surg., Tokyo Women's Medical Univ. Hosp.…S986 Po-498 E valuation of pedicle screw loosening at the distal end of multi-segmental posterior cervical fusion surgery Takaki Inoue, et al., Dept. of Orthop. Surg., Chiba Univ. Hosp.…S986

Poster Spine 2: Cervical spine 2

Po-499 C ervical decompression surgery for patients with tandem spinal stenosis in lumbar spine: Primary cervical decompression surgery could improve lumbar symptoms Taro Inoue, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S987

― 148 ― Po-500 M ultivariate analysis of risk factors affecting outcome of laminoplasty for cervical spondylotic myelopathy Masaaki Machino, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S987 Po-501 A study of slip progression after laminoplasty for cervical spondylotic myelopathy with anterior slip Shuhei Ueda, et al., Dept. of Orthop. Surg., Kyushu Rosai Hosp.…S988 Po-502 I s posterior spinal fixation for the cervical spondylotic myelopathy only as a last resort? Masaaki Chazono, et al., Dept. of Orthop. Surg., Utsunomiya Hosp.…S988 Po-503 P athomechanism and preventive measures for C5 palsy after cervical laminoplasty and anterior decompression and fusion Hideaki Nakajima, et al., Dept. of Orthop. and Rehabilitation Medicine, Univ. of Fukui…S989 Po-504 N atural course of C5 palsy after anterior cervical long fusion Atsushi Yunde, Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S989

Poster Spine 3: Cervical spine 3

Po-505 C omparison of fusion versus non-fusion surgery for retro-odontoid pseudotumor with atlanto-axial subluxation Masashi Uehara, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S990 Po-506 A tlanto-occipital hypermobility associated with revision surgery after C1 posterior arch laminectomy for atlantoaxial instability Shunji Tsutsui, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S990 Po-507 A nalysis of cervical alignment during walking in cases of dropped head syndrome during and after HAL gait training Hideki Kadone, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S991 Po-508 S urgical treatment of dropped head syndrome accompanied with thoracolumbar kyphosis Yuji Matsuoka, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S991 Po-509 S agittal alignment of the patients with dropped head syndrome with negative sagittal vertical axis Kazuma Murata, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S992 Po-510 P reoperative nutritional status influences cervical kyphotic deformity after laminoplasty in patients with cervical spondylotic myelopathy Eiji Takasawa, et al., Dept. of Orthop. Surg., Gunma Univ. Graduate School of Medicine…S992 Po-511 T he prevalence and the risk factor of neck pain in patients with rheumatoid arthritis Akinobu Suzuki, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S993

Poster Spine 4: Lumbar spine 1

Po-512 C omparison micro endoscopic discectomy (MED) with condoliase treatment for lumbar disc herniation Atsushi Yoshioka, et al., Hachiya Orthop. Hosp.…S994 Po-513 Q uantitative analysis using MRI ultra-short TE of intervertebral disc by intraenzyme injection for lumbar disc herniation Tsutomu Oshigiri, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S994 Po-514 E ndplate changes in patients with lumbar disc herniation after discectomy Kenichi Kawaguchi, et al., Dept. of Orthop. Surg., Kyushu Univ. Hosp.…S995 Po-515 T he factors related to immediate improvement after treatment of condoliase in patients with lumbar disc herniation Hiroo Endo, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S995 Po-516 P osterior decompression surgery for lumbar degenerative spondylosis Satoshi Shimizu, et al., Dept. of Orthop. Surg., Narita Memorial Hosp.…S996 Po-517 I n the posterior lumber interbody fusion between the L4/5 degenerative spondylolisthesis, is the correction of the sliding necessary? Sosuke Saito, Dept. of Orthop. Surg., Nihon Univ. Itabashi Hosp.…S996 Po-518 P redictive factors affecting surgical outcomes in patients with degenerative lumbar spondylolisthesis Hiroyuki Inose, et al., Dept. of Orthop. and Trauma Research, Tokyo Medical and Dental Univ.…S997

― 149 ― Po-519 I nfluence of comorbid knee osteoarthritis on surgical outcome and sagittal alignment in elderly patients with degenerative spondylolisthesis undergoing short fusion Motonori Kohno, et al., Dept. of Orthop. Surg., Chigasaki Municipal Hosp.…S997

Poster Spine 5: Lumbar spine 2

Po-520 I ndications and limitations of lumbar decompression surgery: Factors for revision surgery Koji Fujita, et al., Dept. of Orthop. Surg., Univ. of Yamanashi…S998 Po-521 C linical and radiographic evaluations of adjacent segment disease following single-level posterior lumbar interbody fusion for patients with degenerative lumbar disorders Katsunori Fukutake, et al., Dept. of Orthop. Surg., Toho Univ.…S998 Po-522 E ffectiveness of sagittal adjusting screw for lower lumbar lordosis reconstruction in posterior lumbar interbody fusion surgery Toshihiro Nagai, et al., Dept. of Orthop. Surg., Tokai Univ., Oiso Hosp.…S999 Po-523 C linical and radiographic outcomes after transforaminal lumbar interbody fusion with cortical bone trajectory versus percutaneous pedicle screw fixation Keishi Maruo, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S999 Po-524 D ifference in the lumbar interbody fusion between autogenous and artificial bone: Retrospective cohort study with posterior decompression and fusion Shotaro Fukada, et al., Dept. of Orthop. Surg., Kushiro Rosai Hosp.…S1000 Po-525 T itanium coated PEEK cage can avoid posterior migration in transforaminal lumbar interbody fusion compared with conventional PEEK cage Hiroshi Takahashi, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S1000 Po-526 O sseous union after posterior lumbar interbody fusion: Pay attention to big interbody angle Keiichi Nakai, Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1001

Poster Spine 6: Low back pain

Po-527 ＊ P resence of red flags in patients with multiple myeloma who visits orthopaedic surgeon for low back pain Hiroshi Tada, Dept. of Orthop. Surg., Iwate Medical Univ. …S1002 Po-528 ＊ F actors associated with low back pain-related quality of life in inhabitants Norihiko Takegami, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S1002 Po-529 R elationship between lumbar disc degeneration and the occurrence of low back pain over a 10-year period in the general population Kenji Kobayashi, et al., Dept. of Orthop. Surg., School of Medicine, Fukushima Medical Univ.…S1003 Po-530 A ssociation between segmental mobility and intervertebral disc degeneration quantified with magnetic resonance imaging T2 mapping in chronic low back pain Izaya Ogon, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1003 Po-531 M ultifidus muscles lipid content is associated with intervertebral disc degeneration: A quantitative magnetic resonance imaging study Izaya Ogon, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1004 Po-532 A n operative procedure of thermo discoplasty using FELD system for nonspecific HIZ-related low back pain having HIZ and clinical results Takahiro Funato, et al., Spine Center, Kashiwa General Hosp.…S1004

Poster Spine 7: Adult spinal deformity 1

Po-533 M id-term results of short fusion strategy for adult spinal deformity in the elderly Masanari Takami, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S1005

― 150 ― Po-534 P atient characteristics of who can avoid spinopelvic fusion in adult spinal deformity surgery: Redefinition of indication of lumbosacral fusion Junya Katayanagi, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1005 Po-535 S hort fusion for adult spinal deformity : Using of S2AI increases PJK Masayuki Ishihara, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S1006 Po-536 A novel spino-pelvic parameter, thoracic 10 pelvic angle, could predict proximal junctional kyphosis after adult spinal deformity surgery Norihiro Isogai, et al., Dept. of Orthop. Surg., International Univ. of Health and Welfare…S1006 Po-537 R isk factors for proximal junctional kyphosis in fusions from the sacrum to L1 or L2 for adult spinal deformity Koichi Murata, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1007 Po-538 P olyethylene tapes at the proximal end in long spinal fusions reduce the revision rate due to proximal junctional kyphosis Yuji Kakiuchi, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S1007 Po-539 ＊ C omparative study among the three types of UIV anchors to prevent PJK in corrective surgery for adult spinal deformity Ryosuke Yanai, Dept. of Orthop. Surg., Osaka City General Hosp.…S1008

Poster Spine 8: Adult spinal deformity 2

Po-540 T he thoracic compensation in spinal global sagittal balance Masatsune Sato, Dept. of Orthop. Surg., Yokohama Medical Center…S1009 Po-541 C hange of alignment at 2 years after adult spine deformity surgery Koji Fujita, et al., Dept. of orthop. Surg., Yamanashi Univ.…S1009 Po-542 T he change of cervical alignment after spinal long fusion to adult spinal deformity Keisuke Toda, et al., Dept. of Orthop. Surg., Yokohama City Univ. Hosp.…S1010 Po-543 ＊ S itting whole spine alignment in patients with adult spinal deformity Go Yoshida, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1010 Po-544 R od fracture after long fusion with lateral interbody fusion for adult spinal deformity: Is revision surgery necessary? Shunji Tsutsui, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S1011 Po-545 B uttock and groin pain that develops early after adult spinal deformity surgery may be a sacroiliac joint disorder Shizumasa Murata, et al., Dept. of Orthop. Surg., Wakayama Medical Univ.…S1011 Po-546 A relationship between preoperative hounsfield unit values of thoracic spine and adjacent segment fracture after spinal fusion Kentaro Yamane, et al., Dept. of Intelligent Orthop. System Development, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S1012 Po-547 M edical care expenditure for adult spinal deformity surgery including lumbosacral fusion: Differences in length and cost of hospitalization Junya Katayanagi, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1012

Poster Spine 9: Pediatric spinal deformity 1

Po-548 ＊ R isk factors and clinical implications of postoperative shoulder imbalance at minimum 5 years after surgery for adolescent idiopathic scoliosis Masayuki Ohashi, et al., Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S1013 Po-549 T horacic flat back affects lumbar disc degeneration after adolescent idiopathic scoliosis surgery Tsutomu Akazawa, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1013 Po-550 H ow much residual deformity is acceptable after surgery for Lenke type 1 and 2 curves in adolescent idiopathic scoliosis patients? Tetsuhiko Mimura, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S1014

― 151 ― Po-551 I nvestigative study of distal junctional kyphosis following selective thoracic fusion in adolescent idiopathic scoliosis Masato Uematsu, et al., Dept. of Orthop. Surg., Osaka City General Hosp.…S1014 Po-552 ＊ C omparison of 5-year surgical results between ASF and PSF in type 5 AIS- stratification by upper and lower end vertebra Kota Watanabe, et al., Dept. of Orthop. Surg., Keio Univ. …S1015 Po-553 ＊ P revalence and risk factors for subjacent disc wedging after corrective fusion surgery in Lenke type 5C curve patients Tomohiro Banno, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1015 Po-554 P elvic obliquity did not effects on the outcome in patients with adolescent idiopathic scoliosis Tomohiro Banno, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1016

Poster Spine 10: Pediatric spinal deformity 2

Po-555 F requency and factors of mismatch between Risser sign and simplified skeletal maturity scale in patients with idiopathic scoliosis Takeshi Inoue, et al., Dept. of Orthop. Surg., The Jikei Univ. Katsushika Medical Center…S1017 Po-556 C an corrective surgery impact the balance between left and right body surfaces in patients with adolescent idiopathic scoliosis? Yoko Ishikawa, et al., Dept. of Orthop. Surg., Eniwa Hosp.…S1017 Po-557 D oes the segmental flexibility assessed by fulcrum-bending radiograph correlate with predictive each Cobb angle in adolescent idiopathic scoliosis? Sachiko Kawasaki, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S1018 Po-558 U pper instrumented vertebra selection using the modified S-line for adolescent idiopathic scoliosis Lenke type 1B and 1C curves Yoshinari Miyaoka, et al., Dept. of Orthop. Surg., Shinshu Univ. School of Medicine…S1018 Po-559 A ctual condition of back pain in patients with adolescent idiopathic scoliosis Yuta Kusabe, et al., Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S1019 Po-560 U se of tranexamic acid reduced blood loss in adolescent idiopathic scoliosis surgery, patients required preoperative autologous blood storage twice Takahiro Hideshima, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1019 Po-561 A ccuracy of pedicle screw insertion in hybrid operating room for pediatric scoliosis surgery Shunsuke Katsumi, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S1020

Poster Spine 11: Pediatric spinal deformity 3

Po-562 ＊ P erioperative complications in posterior spinal fusion surgery for neuromuscular scoliosis Yusuke Mimura, et al., Dept. of Orthop. Surg., Kitasato Univ.…S1021 Po-563 T he natural history of thoracolumbar kyphosis in achondroplasia Kei Ando, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1021 Po-564 ＊ I ncidence and characteristics of instrumentation failure in growth-sparing surgery for pediatric spine deformity: A retrospective review of the 1,143 surgeries Noriaki Yokogawa, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S1022 Po-565 P rediction of correction rate for growing rod insertion Yoshiaki Oda, et al., Science of Functional Recovery and Reconstruction, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S1022 Po-566 E ffect of brace treatment on abdominal trunk muscle strength in pediatric scoliosis patients Norihiro Oku, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S1023 Po-567 P ostoperative spontaneous correction of lower instrumented vertebra tilt angle in adult idiopathic scoliosis with structural lumbar curve Junya Katayanagi, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1023

― 152 ― Po-568 R isk factors for lateral translation in adult idiopathic adolescent scoliosis with thoracolumbar/ lumbar curves Toshiaki Kotani, et al., Dept. of Orthop. Surg., Seirei Sakura Citizen Hosp.…S1024

Poster Spine 12: Alignment

Po-569 A ge-related changes in T1 and C7 slope and the correlation between them in more than 300 asymptomatic subjects Taro Inoue, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1025 Po-570 R elationship between cervical and global sagittal spinal alignment in patients with dropped head syndrome Takamitsu Konishi, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S1025 Po-571 R isk factors for lumbar degeneration related to the decrease of physical QOL Shiro Imagama, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1026 Po-572 R elationship between sagittal and coronal alignment on degenerative lumbar scoliosis Hideya Yamauchi, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S1026 Po-573 L umbar disc degeneration is associated with spinopelvic parameters Kazuhiro Inomata, et al., Dept. of Orthop. Surg., Gunma Univ. Hosp.…S1027 Po-574 ＊ E ffect of leg-length discrepancy on lumbar spine: Evaluation of correlation between leg-length discrepancy and lumbar scoliosis angle by standing radiograph Tomo Hamada, et al., Dept. of Orthop. Surg., Kanazawa Univ. Hosp.…S1027

Poster Spine 13: LIF 1

Po-575 E valuation of gonadal vessels in the surgical approach of lateral lumbar interbody fusion Yujiro Kagami, Dept. of Orthop. Surg., Konan Kosei Hosp.…S1028 Po-576 P reoperative evaluation of surgical corridor and configuration of the left common iliac vein for oblique lateral interbody fusion at L5/S1 Soichiro Masuda, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1028 Po-577 S etting of surgical indication criteria and ingenuity of transpsoas approach route avoid lumbar plexus injury in lateral lumbar spine surgery Hidetoshi Nojiri, et al., Dept. of Orthop., Juntendo Univ. …S1029 Po-578 C orrective effect of lateral interbody fusion in lateral lumbar interbody fusion for lumbar degenerative spondylolisthesis Shuntaro Wada, Dept. of Orthop. Surg., Iwate Medical Univ. …S1029 Po-579 ＊ E xamination of factors for poor acquisition of local lordosis in minimally invasive interbody fusion using LIF and PPS Masayuki Ishihara, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S1030 Po-580 T he Impact of multiple-level LIF on whole-body alignment Kenyu Ito, et al., Dept. of Orthop. Surg., Konan Kosei Hosp.…S1030 Po-581 L imitation of LIF for percutaneous reduction of degenerative spondylolisthesis: A new radiographic indicator of lateral recess stenosis using I line Ken Ishii, et al., Dept. of Orthop. Surg., International Univ. of Health and Welfare…S1031

Poster Spine 14: LIF 2

Po-582 A trial of mobile transcutaneous pedicle screw combined with oblique lumbar interbody fusion (OLIF) Yawara Eguchi, Center for Orthop. Science Medical Innovation, Graduate School of Medicine, Chiba Univ.…S1032 Po-583 C omparison of postoperative results with single level OLIF and TLIF for lumbar degenerative spondylolisthesis: Multi-institutional research Hiromitsu Takaoka, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S1032 Po-584 ＊ C linical results of single position simultaneous lateral interbody fusion and posterior fusion using percutaneous pedicle screws Koji Uotani, et al., Dept. of Orthop. Surg., Okayama Rosai Hosp.…S1033

― 153 ― Po-585 A dvantages of inserting PPS in the lateral decubitus position in 1 intervertebral LLIF Takafumi Majima, Dept. of Orthop. Surg., Tokyo Rinkai Hosp.…S1033 Po-586 F actors affecting extracage osseous bridges formation after lateral lumbar interbody fusion Shoshi Akiyama, et al., Dept. of Orthop. Surg., The Kashiwa Hosp. of the Jikei Univ. School of Medicine…S1034 Po-587 S hort-term results of Ag-HA coating titanium cages in posterior lumbar interbody fusion Kazumasa Maeda, et al., Dept. of Orthop. Surg., Saga Univ.…S1034 Po-588 S hort term survey of the lateral lumbar interbody fusion using demineralized bone matrix (DBM) Hiroshi Noguchi, Dept. of Orthop. Surg., Univ. of Tsukuba…S1035

Poster Spine 15: Endoscopic surgery 1

Po-589 A prospective comparative study of cervical micro-endoscopic laminotomy (CMEL) and modified CMEL for cervical spondylotic myelopathy Seiji Yamaya, et al., Dept. of Orthop. Surg., Sendai Nishitaga Hosp.…S1036 Po-590 A prospective comparative study of fenestration and micro-endoscopic laminotomy for elderly patients suffering from lumbar spinal stenosis with multiple lesions Seiji Yamaya, et al., Dept. of Orthop. Surg., Sendai Nishitaga Hosp.…S1036 Po-591 A long-term follow of microendscopic discectomy for extreme lateral lumbar disc herniation Hisashi Obara, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1037 Po-592 C linical results of micro endoscopic discectomy and full endoscopic discectomy for lumbar disc hernia Shota Okuda, et al., Dept. of Orthop. Surg., Yamagata Saisei Hosp.…S1037 Po-593 E ndoscopic lumbar herniotomy by BESS (bi-portal endoscopic spine surgery) Takaki Yoshimizu, Spine Center, Seirei Hamamatsu General Hosp.…S1038 Po-594 M icroendoscopy-assisted extraforaminal lumbar interbody fusion: mELIF Motohide Shibayama, Aichi Spine Hosp.…S1038

Poster Spine 16: Endoscopic surgery 2

Po-595 O perating costs of full-endoscopic lumbar spine surgery Hiroaki Manabe, et al., Dept. of Orthop. Surg., Naruto Hosp.…S1039 Po-596 ＊ I s postoperative instability caused by transforaminal full-endoscopic ventral facetectomy? Kazuya Kishima, et al., Dept. of Orthop. Surg., Tokushima Univ. Graduate School…S1039 Po-597 R isk assessment of abdominal and retroperitoneal organ injuries performing transforaminal full- endoscopic spine surgery Kiyoshi Yagi, et al., Dept. of Orthop. Surg., Tokushima Univ. Hosp.…S1040 Po-598 M edium-term treatment result of the FELD transforaminal approach for the lumbar disk massive hernia Takahiro Funato, et al., Spine Center, Kashiwa General Hosp.…S1040 Po-599 F ull endoscopic trans Kambin triangle lumbar interbody fusion Masatoshi Morimoto, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S1041 Po-600 C linical outcomes and interbody fusion rate of full-endoscopic lateral lumbar interbody fusion (FE-KLIF) at one year postoperatively Seiji Yamaya, et al., Dept. of Orthop. Surg., Sendai Nishitaga Hosp.…S1041

Poster Spine 17: Spinal injury

Po-601 C an frailty index affect functional outcomes following traumatic spinal cord injury? Tsunehiko Konomi, et al., Dept. of Orthop. Surg., Murayama Medical Center…S1042 Po-602 T he Surveillance of the return to work of the individuals with spinal cord injury: The age does not matter Satoko Matsumoto Harmon, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S1042

― 154 ― Po-603 ＊ P redictive factors associated with complete motor paralysis following traumatic spinal cord injury: Evaluation using conventional routine blood testing biomarkers Masahiro Ozaki, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S1043 Po-604 Q uickDASH is useful for the evaluation of upper limb function in patients with cervical spinal cord injury without fracture Masahiro Hirahata, et al., Dept. of Orthop. Surg., Teikyo Univ.…S1043 Po-605 S pecificity of the spinal cord injury without bone injury with ossification of the posterior longitudinal ligament: Characteristics and prognosis Takamasa Watanabe, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S1044 Po-606 M orphologic evaluation using three-dimensional CT images for endplate injury in thoracolumbar burst fractures Ryota Takatori, et al., Dept. of Orthop., Graduate School of Medical Science, Kyoto Prefectural Univ. of Medicine…S1044 Po-607 V acuum phenomenon as a predictor of kyphosis after implant removal following posterior fixation without fusion for thoracolumbar burst fracture Masahiro Hirahata, et al., Dept. of Orthop. Surg., Teikyo Univ.…S1045

Poster Spine 18: Osteoporotic vertebral fracture 1

Po-608 S urgical outcome of lower lumbar osteoporotic vertebral collapse with stenosis: A multi-center study Takayoshi Shimizu, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1046 Po-609 R elationship between sagittal spinal alignment and the incidence of vertebral fracture among patients with spinal degenerative disease Yudai Yano, et al., Dept. of Orthop. Surg., Nara City Hosp.…S1046 Po-610 P reoperative CT predicts vertebral fracture after lower lumbar spinal fusion in post-menopausal women Koichi Murata, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1047 Po-611 T he relationship of preoperative vertebral instability and postoperative vertebral collapse in posterior instrumentation surgery with vertebroplasty for osteoporotic vertebral fracture Toru Funayama, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S1047 Po-612 E xamination of risk factors for osteoporotic vertebral fragility fractures (periostin, CT value, ligament ossification) Yuto Nonoue, Dept. of Orthop. Surg., Saga Univ. Hosp.…S1048 Po-613 A ssociation between vertebral instability and bone density and the cross-sectional area of lumbar muscles in postmenopausal osteoporotic vertebral fractures Shun Okuwaki, et al., Dept. of Orthop. Surg., Takahagi Kyodo Hosp. …S1048 Po-614 I nfluence of endplate and/or IVD injuries on the rate of vertebral collapse in osteoporotic vertebral fractures Tatsuhiko Fujiwara, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S1049

Poster Spine 19: Osteoporotic vertebral fracture 2

Po-615 I ncidence and risk factors for secondary fractures after vertebral body fractures Nobuyuki Miyazaki, et al., Dept. of Orthop. Surg., Kotonoura Rehabilitation Center Hosp.…S1050 Po-616 T he degree of vertebral collapse speculation of osteoporotic vertebral fracture by MR and CT at early time of injury Nobuyuki Suzuki, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S1050 Po-617 C linical characteristics and impact of osteoporotic vertebral domino fractures on activities of daily living Tetsuto Yamaura, et al., Dept. of Orthop. Surg., Minato Central Hosp.…S1051 Po-618 P reoperative scoring system for predicting adjacent vertebral fractures after balloon kyphoplasty using unweighted imaging Koji Matsumoto, et al., Dept. of Orthop. Surg., Nihon Univ.…S1051

― 155 ― Po-619 S ustained beneficial effect of balloon kyphoplasty for osteoporotic vertebral fracture: Longitudinal analysis of minimal two years follow-up Yusuke Hori, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S1052 Po-620 S urgical outcome of preoperative sagittal malalignment treated by vertebroplasty with posterior spinal fusion Yohei Shibuya, et al., Dept. of Orthop. Surg., Niigata Univ. Medical and Dental Hosp.…S1052 Po-621 R isk factors for adjacent vertebral fracture after balloon kyphoplasty (BKP) for osteoporotic vertebral fractures: Comparison of device of BKP Daisuke Matsuyama, Dept. of Orthop. Surg., Japanese Red Cross Hadano Hosp.…S1053 Po-622 P revention of secondary vertebral fractures for osteoporotic vertebral fracture: Usefulness of early intervention of balloon kyphoplasty within 2 weeks Yuji Tokuumi, et al., Dept. of Orthop. Surg., Asanogawa General Hosp.…S1053

Poster Spine 20: OPLL, DISH & general

Po-623 ＊ R isk factors for progression of ossification of the posterior longitudinal ligament in asymptomatic subjects Toru Doi, et al., Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S1054 Po-624 ＊ R elationship between ossification of the posterior longitudinal ligament and serum amino acid Ryo Araki, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S1054 Po-625 P revention of further surgery after posterior decompression for lumbar spinal canal stenosis in patients with diffuse idiopathic skeletal hyperostosis Hideaki Nakajima, et al., Dept. of Orthop. and Rehabilitation Medicine, Univ. of Fukui…S1055 Po-626 A n analysis of hounsfield unit of the thoracic vertebrae in the patients of diffuse idiopathic skeletal hyperostosis Masahiro Miyano, et al., Dept. of Orthop. Surg., Hakodate Central General Hosp.…S1055 Po-627 A nalysis of three-dimensional bone mineral density measured by quantitative computed tomography in a patient with diffuse idiopathic skeletal hyperostosis Koki Tsuchiya, et al., Dept. of Orthop. Surg., Showa Univ.…S1056 Po-628 F actors associated with sacroiliac joint ankylosis Tomotada Fujita, et al., Dept. of Orthop. Surg., Enshu Hosp.…S1056

Poster Spine 21: Spine tumor

Po-629 C linical outcomes of posterior stabilization without decompressive laminectomy for the treatment of spinal cord compression caused by metastatic spinal tumors Hiroshi Uei, et al., Dept. of Orthop. Surg., Nihon Univ. Hosp.…S1057 Po-630 S cores of four prognostic scoring system reflect the prognosis of patients with metastatic spine tumor Masahiro Iinuma, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1057 Po-631 N ew revision of revised Tokuhashi score: New prognostic criteria for metastatic spinal tumor in surgical cases Masahiro Iinuma, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1058 Po-632 O utcomes of palliative surgery for spinal pathological fractures: Changes in performance status according to the Glasgow prognostic score Chikara Ushiku, Dept. of Orthop. Surg., The Kashiwa Hosp. of the Jikei Univ. School of Medicine…S1058 Po-633 W hat are the factors affecting for the result of surgical intervention for the non-ambulation patients by metastatic spinal tumor? Akira Iwata, et al., Dept. of Preventive and Therapeutic Research for Metastatic Bone Tumor, Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1059 Po-634 E ffects of pre-operative nutritional status on complications of metastatic spinal tumor surgery Akira Iwata, et al., Dept. of Preventive and Therapeutic Research for Metastatic Bone Tumor, Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1059

― 156 ― Poster Spine 22: Infection & spinal cord tumor

Po-635 E valuation of factors related to prognosis of surgical treatment for pyogenic spondylitis Kazumasa Konishi, et al., Dept. of Orthop. Surg., Kyorin Univ. …S1060 Po-636 C linical outcome of spinal instrumentation surgery for infectious spondylitis Shunsuke Katsumi, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S1060 Po-637 T horaco-lumbar pyogenic spondylodiscitis with thoracic cavity infection is refractory to drainage surgery Katsuhisa Yamada, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1061 Po-638 ＊ C linical characteristics of pediatric spinal cord tumors Hiroyuki Koshimizu, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1061 Po-639 R esults of the resection of spinal meningioma with the inner layer of dura over 10 years after surgery Hiroyuki Tominaga, et al., Dept. of Orthop. Surg., Kagoshima Univ. Hosp.…S1062 Po-640 R ecapping T-saw laminoplaty for thoracic spinal cord tumor and cauda equina tumor: A comparison of thoracic level and lumbar level Kazuya Shinmura, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S1062 Po-641 D ifferentiation between spinal schwannoma and meningioma using MRI images Shutaro Fujimoto, et al., Dept. of Orthop. Surg., Hokkaido Saiseikai Otaru Hosp.…S1063 Po-642 E arly postoperative recovery of gait function is delayed in spinal tumor patients with proprioceptive defects Ryo Fukata, et al., Dept. of Rehabilitation Medicine, Chiba Univ. Hosp.…S1063

Poster Spine 23: Complication

Po-643 M ulticenter study on surgical site infection and incidental dural tears regarding posterior open thoracolumbar laminectomy and/or herniotomy for degenerative diseases Satoshi Ogihara, et al., Dept. of Orthop. Surg., Saitama Medical Center, Saitama Medical Univ.…S1064 Po-644 P reliminary algorithm using laboratory markers at 1 and 4 days postoperatively is useful screening for SSI following lumbar spinal surgery Eiichiro Iwata, et al., Dept. of Orthop. Surg., Nara City Hosp.…S1064 Po-645 D id dural tears affect postoperative patient outcomes?: Multicenter observational study with propensity score Koji Nakajima, et al., Dept. of Orthop. Surg., The Univ. of Tokyo Hosp.…S1065 Po-646 P reoperative prognostic nutritional index is predictive factor for medical complication after cervical posterior decompression surgery Kenta Kurosu, Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1065 Po-647 F actors affecting the occurrence and increase of DVT in the perioperative period of lumbar surgery Takashi Imuro, et al., Dept. of Orthop. Surg., Atsugi City Hosp.…S1066 Po-648 P revention and therapy of venous thromboembolism in patients with undergoing spine surgery Tomoyuki Kusukawa, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S1066 Po-649 A nkylosing spine and kyphosis are risk factors for surgical site complication after posterior thoracolumbar spine surgery Mitsuru Asukai, et al., Dept. of Orthop. Surg., Hokkaido Spinal Cord Injury Center…S1067 Po-650 H yperamylasemia following spinal surgery have different risk factors between minors and adults Masahiro Iinuma, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1067

Poster Spine 24: Intraoperative neuromonitoring

Po-651 C ontrol of muscle evoked potential after transcranial electrical stimulation to the brain for intraoperative neurophysiological monitoring during cervical spine surgery Muneharu Ando, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S1068

― 157 ― Po-652 A nesthetic fade of muscle evoked potential after transcranial electrical stimulation to the brain during cervical spine surgery Muneharu Ando, et al., Dept. of Orthop. Surg., Kansai Medical Univ.…S1068 Po-653 A vailability of intraoperative spinal cord monitoring in intradural extramedullary tumor surgery: Examination of tumor location and intraoperative procedure Shinji Morito, et al., Dept. of Orthop. Surg., Kurume Univ. School of Medicine…S1069 Po-654 R eference interval of intraoperative posterior tibial nerve somatosensory evoked potentials Yasuaki Imajo, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S1069 Po-655 T he relationship between neurological findings and intraoperative posterior tibial nerve SEP amplitude Yasuaki Imajo, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S1070 Po-656 C an we use spinal cord monitoring under general anesthesia with desflurane during spine surgery? Sachiko Kawasaki, et al., Dept. of Orthop. Surg., Nara Medical Univ.…S1070

Poster Spine 25: Muscle

Po-657 ＊ D eclining neck circumference is related to presarcopenia: Neck circumference measured by bioelectrical impedance analysis is interchangeable with manual measurement Masaaki Machino, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1071 Po-658 P revalence and postoperative change of locomotive disorders and sarcopenia in adult spinal deformity Tetsuro Ohba, Dept. of Orthop. Surg., Yamanashi Univ.…S1071 Po-659 R elation among grip power/core muscle strength and radiographic parameters of ASD: A community-dwelling cohort study Hiroki Okayasu, et al., Dept. of Orthop. Surg., Asahikawa Red Cross Hosp.…S1072 Po-660 E valuation of trunk muscle in elderly women with adult spinal deformity Shigeru Soshi, et al., Dept. of Orthop. Surg., The Kashiwa Hosp. of the Jikei Univ. School of Medicine…S1072 Po-661 A trophy of psoas major in patients with greater paraspinal muscle fat infiltration suggests decreased co-contraction as an antagonist muscle Yuji Hatakeyama, et al., Dept. of Orthop. Surg., Akita Red Cross Hosp.…S1073 Po-662 W hich comorbidities are handgrip strength in patients with lumbar spinal stenosis influenced by? Hirokazu Inoue, et al., Dept. of Orthop., Jichi Medical Univ.…S1073

Poster Spine 26: Evaluation & imaging

Po-663 F ilm terminaleimage findings on intraoperative lumbar spinal ultrasonography Tomohiko Hasegawa, et al., Dept. of Orthop. Surg., Hamamatsu Univ. School of Medicine…S1074 Po-664 C ervical spine movement during swallowing Chikara Hayakawa, et al., Dept. of Orthop. Surg., Showa Univ.…S1074 Po-665 N ew quantitative method to evaluate pedicle screw loosening after spinal instrumentation using digital tomosynthesis Kentaro Mataki, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S1075 Po-666 T hree-dimensional visualization of epidural fat relative to dural sac and spinal nerve root of lumbar spinal canal stenosis using MRI Junji Kamogawa, Spine Center, Shiraishi Hosp.…S1075 Po-667 A nalysis of postoperative hematoma on an acute MRI after full-endoscopic transforaminal discectomy Hiroki Yoshimatsu, et al., Dept. of Orthop. Surg., Aichi Spine Hosp.…S1076 Po-668 M orphological analysis of Kambinʼs triangle using AI-generated 3D lumbar nerve root images Katsuhisa Yamada, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1076 Po-669 M RI analysis of vessel location at anterior lumbosacral vertebral body Masashi Wakasugi, et al., Dept. of Orthop. Surg., Uonuma Kikan Hosp.…S1077

― 158 ― Poster Spine 27: Evaluation & basic research

Po-670 I mportance of the gait-loading test in lumbar spinal stenosis Keiko Suzuki, et al., Dept. of Orthop. Surg., Saitama Medical Univ.…S1078 Po-671 B alance analysis for cervical myelopathy patients by the original evaluation method using force plate Shogo Takaya, et al., Rehabilitation Center, Kochi Medical School Hosp.…S1078 Po-672 E xperimental accuracy measurement of navigation gap in O-arm navigation surgery Ryo Tamaki, et al., Dept. of Orthop. Surg., Tokyo Womenʼs Medical Univ. Hosp.…S1079 Po-673 E nhancement of dormant pathways in the brain following rat contusive spinal cord injury Ryosuke Hirota, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1079 Po-674 C orrelation analysis of CCL20/CCR6 system and inflammatory cytokine in the human degenerated intervertebral disc Akihiko Hiyama, et al., Dept. of Orthop. Surg., Tokai Univ.…S1080 Po-675 P 38 MAPK regulates TNFα-stimulated IL6 production in human ligamentum flavum cells Kenji Kato, et al., Dept. of Orthop. Surg., Nagoya City Univ., Graduate School of Medical Sciences…S1080

Poster Spine 28: General

Po-676 M ulticenter study of poor prognostic factors and treatment of spontaneous spinal epidural hematoma Hiroki Fukui, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S1081 Po-677 T he treatment outcome of 28 spontaneous spinal epidural hematoma Hiroshi Maruyama, et al., Dept. of Orthop. Surg., Showa Univ.…S1081 Po-678 C linical findings in 22 cases of spinal cord infarction Takuya Nagai, et al., Dept. of Orthop. Surg., Univ. of Miyazaki Hosp.…S1082 Po-679 A ge-related spinal canal narrowing in thoracolumbar spine Hiroaki Nakashima, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1082 Po-680 I s bipolar sternocleidomastoid release necessary for neglected congenital muscular torticollis in adolescent and adult patients? Haruki Funao, et al., Dept. of Orthop. Surg., International Univ. of Health and Welfare…S1083 Po-681 C linical results of foramen magnum decompression with microsurgical resection of outer layer of the dura for Chiari malformation Toshiaki Maruyama, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S1083 Po-682 I nfluence of spinal surgery for spinal degenerative disease on polypharmacy Satoshi Suzuki, et al., Dept. of Orthop. Surg., Keio Univ. …S1084 Po-683 A ssessment of state in spinal disorders for publication in high impact journals Ryosuke Hirota, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1084

Poster Forefoot

Po-684 A study of risk factors related to the progression of second metatarsophalangeal joint dislocation associated with hallux valgus Tetsuro Kokubo, et al., Dept. of Orthop. Surg., Tachikawa Hosp.…S1085 Po-685 C linical result of distal oblique metatarsal osteotomy for hallux valgus: Correction degree and SAFE-Q improvement Yasutaka Murahashi, Dept. of Orthop. Surg., Sapporo Medical Univ.…S1085 Po-686 R etrospective study of the Mann modified operation for severe hallux valgus deformity Seiji Watanabe, et al., Dept. of Bone and Joint Surg., Ehime Univ. Graduate School of Medicine…S1086 Po-687 E valuation of medial arch of the foot after Lapidus procedure Tadashi Kimura, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S1086

― 159 ― Po-688 F resh cadaveric study of the distances from the deep plantar arch to the lesser metatarsals Ichiro Tonogai, et al., Dept. of Orthop. Surg., Tokushima Univ. Hosp.…S1087 Po-689 T he examination of the modified Mitchellʼs operation for hallux valgus deformity Takashi Koyama, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S1087

Poster Ankle injury & alignment

Po-690 T he high prevalence of deep posterior inferior tibiofibular ligament injuries evaluated by oblique axial MRI Kousuke Shiwaku, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1088 Po-691 E valuation of morphological relationship between calcaneofibular ligament and anterior talofibular ligament in lateral ankle ligament injury with 3D-MRI Masaya Nagatomo, et al., Dept. of Orthop. Surg., Fukuoka Univ.…S1088 Po-692 R elationship between calcaneofibular ligament injury and peroneal tendon-calcaneus distance on MRI in lateral ankle ligament injury Akinori Nekomoto, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S1089 Po-693 E valuation of mechanical character for anterior talofibular ligament under stress using shear wave elastography Yuki Sugino, et al., Dept. of Orthop. Surg., Fukuoka Univ.…S1089 Po-694 E valuation of Achilles tendon length after internal brace Shuichi Chida, et al., Dept. of Orthop. Surg., Hiraka General Hosp. …S1090 Po-695 L ower limb alignment changes in vivo stress distribution patterns of the ankle joint: Analysis using computed tomography osteoabsorptiometry Shinji Matsubara, et al., Dept. of Orthop. Surg., Hokkaido Univ. Hosp.…S1090 Po-696 L ocation of calcaneus images in long leg standing X-ray performed in anterior-posterior (AP) view Yuki Ueno, et al., Dept. of Orthop. Surg., Uda City Hosp.…S1091

Poster Midfoot

Po-697 P ercutaneous drilling of symptomatic accessory navicular in skeletally immature children: A radiologic study So Minokawa, et al., Dept. of Orthop. Surg., Chikushi Hosp., Fukuoka Univ.…S1092 Po-698 M RI appearance of deltoid ligament injury in patient with PTTD and spring ligament injury Kaoru Kitsukawa, et al., Dept. of Radiology, St. Marianna Univ. School of Medicine…S1092 Po-699 J oint-preserving surgery for stage 4 adult-acquired flatfoot deformity Naoki Haraguchi, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine, Yokohama Seibu Hosp.…S1093 Po-700 O bservation of changes in foot morphology by time in children and adolescents: A retrospective cohort study Manato Horii, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S1093 Po-701 R ole of the plantar ligament in the treatment of flexible flatfoot Masakazu Tazaki, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1094 Po-702 A natomical variants associated with peroneal tendon pathologies: MRI findings in asymptomatic ankles Masashi Nei, et al., Dept. of Orthop. Surg., Teikyo Univ.…S1094

Poster Hindfooot

Po-703 ＊ T 1p relaxation time of subtalar articular cartilage in patients with stage-3b ankle osteoarthritis Yuhei Maki, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine, Yokohama Seibu Hosp.…S1095 Po-704 ＊ R elationship between cystic changes of calcaneus and navicular bone and clinical outcomes after combined total ankle arthroplasty Koji Nukuto, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S1095 Po-705 ＊ P athogenetic analysis of ankle osteoarthritis in a Japanese population Masataka Kakihana, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1096

― 160 ― Po-706 C linical results of total ankle arthroplasty with total talar prosthesis for revision TAA (revision combined TAA) Kiminari Kataoka, et al., Dept. of Orthop. Surg., Kobe Univ. Graduate School of Medicine…S1096 Po-707 C hanges in ankle joint alignment after high tibial osteotomy: The difference between hybrid closed wedge and opening wedge procedure Atsushi Sugawara, et al., Dept. of Orthop. Surg., Iwate Medical Univ. …S1097 Po-708 E fficacy and limitations of conservative treatment for ankle osteoarthritis Yuki Tochigi, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1097 Po-709 R ange of motion of implants after transfibular total ankle arthroplasty (trabecular metal total ankle): Taking implant installation angle into consideration Kota Shimomura, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1098

Poster Pediatrics 1: Upper extremity & general

Po-710 R elationship between range of motion of IP joint and alignment in postoperative X-ray of thumb polydactyly Taisei Yamauchi, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S1099 Po-711 O utcomes in treatment of the clasped thumb Hikaru Hayakawa, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1099 Po-712 T wo cases of upper arm length shortening after neonatal purulent shoulder arthritis Taku Watanabe, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1100 Po-713 E piphyseal arrest of the medial epicondyle after fixation for pediatric medial humeral epicondyle fractures Tomokazu Sawada, et al., Dept. of Orthop. Surg., Shizuoka City Shizuoka Hosp.…S1100 Po-714 B one lesions and clinical symptoms in chondrodysplasia punctata Shigemasa Komatsu, Dept. of Orthop. Surg., Miyagi Childrenʼs Hosp.…S1101 Po-715 ＊ C an preoperative decision making using PFKE Index improve postoperative gait outcomes in cerebral palsy? Kohei Shimoyama, et al., Hokkaido Med. Center For Child Health and Rehabilitation…S1101 Po-716 T he low birth weight infants do not have a relation to abnormality at the newborn-screening Asako Endo, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1102 Po-717 F inding survey of regional medical examinations using primary medical examination for hip dislocation in infant health checkup guide line Noboru Oikawa, et al., Dept. of Orthop. Surg., Saitama Childrenʼs Medical Center…S1102

Poster Pediatrics 2: Lower extremity

Po-718 P roblems of long-term follow up of congenital clubfoot surgery: Analysis using PROMs subscale Takaaki Hirano, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1103 Po-719 S hort term results of the Ponseti method in the treatment of idiopathic clubfoot Reiko Murakami, Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S1103 Po-720 M id-term results of Ponseti methods and investigation for relapse cases Masataka Kakihana, et al., First Dept. of Orthop. Surg., Dokkyo Medical Univ. Saitama Medical Center…S1104 Po-721 P ostsurgical outcomes with the radiographic findings in congenital clubfeet after posteromedial release without talocalcaneal joint release Hideaki Watanabe, et al., Dept. of Pediatr. Orthop., Jichi Childrenʼs Medical Center Tochigi…S1104

― 161 ― Po-722 D oes early salter innominate osteotomy shorten the duration of fragmentation in Perthes disease? Kenichi Mishima, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1105 Po-723 E ffect of Salter osteotomy on the acetabular morphology in Perthes disease Hiroshi Kaneko, et al., Dept. of Orthop. Surg., Aichi Childrenʼs Health and Medical Center…S1105 Po-724 T he characteristics of the whole pelvic morphology including pelvic inclination in slipped capital femoral epiphysis Masanori Wako, et al., Dept. of Orthop. Surg., Graduate School of Medical Science, Univ. of Yamanashi…S1106 Po-725 ＊ P athological fracture of solitary bone cyst in calcaneus Manabu Hoshi, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S1106

Poster Trauma 1: Elbow

Po-726 E pidemiological study of supracondylar fracture of the humerus in children: Including cooperation with pediatric emergency doctors Naho Nemoto, et al., Dept. of Orthop. Surg., Saitama Childrenʼs Medical Center…S1107 Po-727 T he risk factors of malunion with humeral supracondylar fracture in children: A multi center study: TRON study Toru Imai, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1107 Po-728 O perartive treatment for pediatric humeral supuracondylar fracture Aileen Go, et al., Dept. of Orthop. Surg., Aichi Medical Univ., School of Medicine…S1108 Po-729 U nstable elbow joint dislocation fracture in children and adolescents Koji Sukegawa, et al., Dept. of Orthop. Surg., Kitasato Univ.…S1108 Po-730 S urgical results of distal humerus fractures Toshinori Tohgi, et al., Dept. of Orthop. Surg., Tokyo Medical Univ.…S1109 Po-731 M odified paratricipital approach without mobilization of the ulnar nerve prevents postoperative ulnar neuropathy in distal humerus fractures Tomoaki Kurashige, et al., Dept. of Orthop. Surg., Yokohama Rosai Hosp.…S1109 Po-732 C onservative treatment for distal humeral fractures of the elderly in our institution Daichi Ota, Dept. of Orthop. Surg., Sanyudo Hosp.…S1110 Po-733 T reatment for dislocation fractures of elbow with ulnar coronoid fractures Hidetoshi Teraura, et al., Dept. of Orthop. Surg., Higashisumiyoshi Morimoto Hosp.…S1110 Po-734 T ension band wiring with eyelet wire for displaced olecranon fractures significantly improve postoperative complication rate than anatomical locking plate fixation Haruhiko Shimura, Dept. of Orthop. Surg., Tokyo Bay Medical Center…S1111

Poster Trauma 2: Hand & wrist

Po-735 ＊ I nternal fixation of the distal ulnar fracture complicated with the distal radius fracture of elderly people Kosuke Shimazaki, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1112 Po-736 I mpact of radial distraction on ulnar variance during volar locking plating of distal radius fractures Shinji Yoshida, et al., Dept. of Orthop. Surg., Tokai Univ.…S1112 Po-737 T he relationship of plate position and postoperative correction loss using Stellar 2 plate for distal radius fracture Shinya Furukawa, et al., Dept. of Orthop. Surg., Nihon Univ. Itabashi Hosp.…S1113 Po-738 C omplications after volar locking plate fixation of distal radius fractures Hiroshi Satake, et al., Dept. of Orthop. Surg., Yamagata Univ.…S1113 Po-739 I ntramedullary nail fixation for distal radial fractures in patients fifty years of age and older: A retrospective case-series analysis Takuma Wakasugi, et al., Dept. of Orthop. Surg., Konan Hosp.…S1114

― 162 ― Po-740 T he effect of distal radius fragility fracture on ambulation: Change of functional independence measure (FIM) score before and after surgery Ryota Sugimura, Dept. of Orthop. Surg., Teikyo Univ. Hosp.…S1114 Po-741 T he two cases of the scaphoid fracture associated with saving the ball on the palm in soccer goalkeepers Takuya Tada, et al., Dept. of Orthop. Surg., Kitasato Univ.…S1115

Poster Trauma 3: Pelvic fracture

Po-742 C omparison of the measurement of roof-arc angle for acetabular fractures between radiography and 3D-CT templating correlated with postoperative clinical evaluation Hiroya Kondo, et al., Dept. of Orthop. Surg., Okayama Univ. Hosp.…S1116 Po-743 N avigation-guided screw fixation for unstable pelvic injuries Takenori Uehara, et al., Dept. of Emergency Healthcare and Disaster Medicine, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S1116 Po-744 C linical results of percutaneous screw fixation for fragile fractures of pelvis Satoshi Nakasone, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S1117 Po-745 T he difference in bone mineral density between acetabular fracture and proximal femoral fracture for elderly patients Naoya Inagaki, et al., Dept. of Orthop. Surg., The Kashiwa Hosp. of the Jikei Univ. School of Medicine…S1117 Po-746 ＊ F actors affecting the severity of fragility fractures of the pelvis: The relationship between lean muscle volume and fracture displacement Shintaro Honda, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1118 Po-747 A nalysis of the relationship between fracture type and bone mineral density/bone metabolic markers in fragility fractures of the pelvis Junichirou Sarukawa, et al., Dept. of Orthop. Surg., Iwata City Hosp.…S1118 Po-748 M RI of the pubic bone fracture in the elderly: Relationship with external obturator muscle Shinya Adachi, et al., Dept. of Rheumatology, JCHO Yugawara Hosp.…S1119

Poster Trauma 4: Proximal femur 1

Po-749 A study of middle-aged patients femoral proximal fractures Shuhei Matumura, et al., Dept. of Orthop. Surg., Hiroshima Prefectural Hosp.…S1120 Po-750 ＊ S tudy of the treatment of proximal femoral fracture over 100 years old Miki Hidaka, et al., Dept. of Orthop. Surg., Miyazaki Medical Association Hosp.…S1120 Po-751 C omparison of proximal femur fractures in the very old and late elderly over 100 years of age Shuntaro Harata, Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S1121 Po-752 I nvestigation of factors that determine the type of hip fracture using finite element analysis Sei Yano, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Chiba Univ.…S1121 Po-753 E xamination of postoperative failure factors of osteosynthesis for non-dislocated femoral neck fracture Kenya Saruta, et al., Dept. of Orthop. Surg., Tsugaru Sougo Hosp.…S1122 Po-754 F actors that increase the risk of a subsequent contralateral proximal femoral fracture Gaku Matsuzawa, et al., Dept. of Orthop. Surg., Iwaki City Medical Center…S1122

Poster Trauma 5: Proximal femur 2

Po-755 ＊ B lood transfusion in patients with proximal femoral fracture Tomoko Kanazawa, et al., Dept. of Orthop. Surg., Red Cross Kobe Hosp.…S1123 Po-756 P reoperative screening for deep vein thrombosis with proximal femoral fracture Yoshihiro Onada, et al., Dept. of Orthop. Surg., Tonan Hosp.…S1123 Po-757 M ultidisciplinary approach to prevent secondary fractures after geriatric hip fractures: What have changed after this approach? Etsuo Shoda, et al., Dept. of Orthop. Surg., Nishinomiya Hosp.…S1124

― 163 ― Po-758 E xamination affecting the clinical result for the preoperative nutritional status of femoral neck fracture Katsuya Yokoyama, et al., Dept. of Orthop. Surg., Tokai Univ., Oiso Hosp.…S1124 Po-759 R isk factors for decreased walking ability in femoral trochanteric fracture Shota Morimoto, et al., Dept. of Orthop. Surg., Hyogo College of Medicine…S1125 Po-760 A natomical study of the anterior torsion of the femoral neck by 3D evaluation Kohei Sato, et al., Science of Functional Recovery and Reconstruction, Okayama Univ. Graduate School of Medicine, Dentistry and Pharmaceutical Sciences…S1125

Poster Trauma 6: Femur

Po-761 T he usefulness of the woodpecker spinning system for bipolar hip arthroplasty Yusuke Maezumi, et al., Dept. of Orthop. Surg., Aizawa Hosp.…S1126 Po-762 C linical outcomes after fixation for undisplaced femoral neck fractures Takashi Iwakura, et al., Dept. of Orthop. Surg., Sanda City Hosp.…S1126 Po-763 E xamination of poor results of femoral neck fractures internally fixed with Hansson pinlock Ryo Ando, et al., Dept. of Orthop. Surg., Seitetsu Kinen Muroran Hosp.…S1127 Po-764 S hould the postoperative reduction of stable trochanteric fractures of the femur aim at the extramedullary type? Atsushi Matsuo, et al., Dept. of Orthop. Surg, St. Maryʼs Hosp.…S1127 Po-765 C linical outcome of taper wedge stem for femoral neck fracture Takashi Iwakura, et al., Dept. of Orthop. Surg., Sanda City Hosp.…S1128 Po-766 T iming of conversion from external fixation to internal fixation for femoral shaft fractures Ryu Tamura, et al., Dept. of Orthop. Surg., Fukuyama City Hosp.…S1128

Poster Trauma 7: Knee

Po-767 A study of surgical treatment for periprosthetic fracture with bone cement as an internal material Hiroaki Murakami, et al., Dept. of Orthop. Surg., Asa Citizens Hosp.…S1129 Po-768 E ffectiveness of Ilizarov external fixation and osteoporosis treatment rates in periprosthetic fractures Koji Nozaka, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S1129 Po-769 C auses of insufficiency fracture of medial tibial condyle Satoshi Kishiro, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1130 Po-770 R isk factors of insufficiency fracture of medial tibial condyle Satoshi Kishiro, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1130 Po-771 A study on factors of poor reduction of posterior lateral fragment in tibial plateau fracture Yusuke Iesaki, Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1131 Po-772 A novel arthroscopic treatment with endbotton for tibia eminence fracture Yuji Kanaya, et al., Dept. of Orthop. Surg., Jichi Univ. Hosp.…S1131

Poster Trauma 8: Lower leg & foot

Po-773 S urgical registration of lower extremities open fracture Yuka Kobayashi, et al., Dept. of Orthop. Surg., Tokai Univ.…S1132 Po-774 ＊ E arly versus delayed weight-bearing after intramedullary nail for tibia shaft fracture: A multicenter, propensity score-matched study: TRON study Ryota Uemi, et al., Dept. of Orthop. Surg., Nagoya Univ. Hosp.…S1132 Po-775 T he wait time to surgery following injury affects functional outcomes and complications after ankle fractures: A propensity-score matched analysis TRON study Takayuki Sugino, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1133 Po-776 E xamination of the lower limbs trauma that set up a simple-style Ilizarov external fixation temporarily Kenji Ikuta, et al., Dept. of Orthop. Surg., Kainan Hosp.…S1133

― 164 ― Po-777 E asy planning of free flaps: End to side anastomosis to major artery and accompanying veins Yusuke Kameda, et al., Dept. of Orthop. Surg., Hand Center, Obihiro Kosei General Hosp.…S1134 Po-778 ＊ W hat is the effect of anterior inferior tibiofibular ligament reconstruction on syndesmosis injury: Cadaver research Kenichi Kawabata, et al., Dept. of Orthop. Surg., Teikyo Univ.…S1134 Po-779 T reatment of intra-articular calcaneal fractures with minimally invasive plate osteosynthesis by sinus tarsi approach Takumi Okada, Dept. of Orthop. Surg., Showa Univ.…S1135

Poster Trauma 9: Shoulder & other fractures

Po-780 W hich patients with displaced clavicle fractures can accept non-surgical treatment? Isao Takei, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine, Yokohama Seibu Hosp.…S1136 Po-781 C onservative treatment of proximal humeral neck fracture: Multicenter study Takashi Toma, et al., Orthop. Surg., Graduate School of Medicine, Univ. of the Ryukyus…S1136 Po-782 T he effect of proximal fragility humerus fractures on locomotive function Kensuke Ikuta, et al., Dept. of Orthop. Surg., Teikyo Univ.…S1137 Po-783 T he operative treatment of humeral metastatic bone tumor using “docking nail method”: Two case report Go Sakai, Dept. of Orthop. Surg., Komaki City Hosp.…S1137 Po-784 W hat is the cause of delay to start of orthopaedic emergency surgery in emergency and critical care center? Kentaro Sato, et al., Emergency and Critical Care Medicine, St. Marianna Univ. School of Medicine…S1138 Po-785 T reatment results for compartment syndrome associated with traffic injury in our hospital Kazuki Motoya, et al., Dept. of Orthop. Surg., Tokyo Medical Univ. Hosp.…S1138 Po-786 I nvestigation into the relationship between low intensity pulsed ultra-sound usage and bone union at our hospital Moehito Sakaida, et al., Dept. of Orthop. Surg., Shizuoka City Shizuoka Hosp.…S1139

Poster RA 1: Surgical treatment

Po-787 ＊ U sing selective nerve block and wake up test is useful technic for multiple tendon transfer Ayaka Kuzuhara, et al., Dept. of Orthop. Surg., Toho Univ.…S1140 Po-788 C omparison of resection arthroplasty and joint-preserving arthroplasty for rheumatoid forefoot deformity Keita Nagira, et al., Dept. of Orthop. Surg., Tottori Univ.…S1140 Po-789 T he usefulness of planter side locking plate for the correction of hallux valgus and early weight bearing gait in RA Motohiro Suzuki, et al., Dept. of Orthop. Surg., Omaezaki Municipal Hosp.…S1141 Po-790 P redictor of postoperative hallux valgus recurrence Norio Tabuki, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1141 Po-791 M id-term clinical outcomes of reverse shoulder arthroplasty in patients with rheumatoid arthritis using patient-reported outcome measures (Shoulder36) Yuichi Nagase, et al., Dept. of Rheumatic Surg., Tokyo Metropolitan Tama Medical Center…S1142 Po-792 E ffect of drug and surgical treatments on disease activity in patients with rheumatoid arthritis of 65 years or more Ken Kumagai, et al., Musculoskeletal Science, Yokohama City Univ. Graduate School of Medicine…S1142

Poster RA 2: Pharmacotherapy

Po-793 P redictors of progression of knee joint destruction in patients with rheumatoid arthritis treated with biological DMARDs Daisuke Kihira, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1143 Po-794 D isease modifying anti-rheumatic drugs therapy after the diagnosis of cancers in patients with rheumatoid arthritis Yutaka Yokota, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1143

― 165 ― Po-795 E ffect of eGFR level in patients with rheumatoid arthritis on drug selection Hisashi Oki, et al., Dept. of Orthop. and Rehabilitation Medicine, Univ. of Fukui…S1144 Po-796 R esponse of patients with elderly onset rheumatoid arthritis to methotrexate compared with younger onset Shuji Asai, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1144 Po-797 E xamination of the herpes zoster during treatment for rheumatoid arthritis Masataka Maeda, et al., Dept. of Orthop. Surg., Nagoya Univ. Hosp.…S1145 Po-798 T he effectiveness of biologic agents concomitant with tacrolimus in rheumatoid arthritis Kenya Terabe, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1145 Po-799 E arly improvement of the power Doppler signal at week 4 can predict to continue the biological DMARDs after 1 year Tadashi Okano, et al., Dept. of Orthop. Surg., Osaka City Univ. Graduate School of Medicine…S1146 Po-800 L ong-term maintenance of golimumab treatment effectiveness in RA patients with low disease activity who previously received other TNF inhibitors Hiroki Wakabayashi, et al., Dept. of Musculoskeletal Surg., Mie Univ. Graduate School of Medicine…S1146

Poster RA 3: General 1

Po-801 ＊ D ominant contribution of the shoulder joints to pain VAS and functional evaluation in rheumatoid arthritis patients Akio Umemoto, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1147 Po-802 J apanese version of the decision regret scale for the patients with rheumatoid arthritis who underwent surgery of wrist or fingers Kengo Harigane, et al., Center for Rheumatic Diseases, Yokohama City Univ. Medical Center…S1147 Po-803 E xamination of patient-reported outcome in patient with rheumatoid arthritis Hironobu Kosugiyama, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1148 Po-804 A nalysis of the bone morphology of the distal radius in rheumatoid patients with ruptured extensor tendons Daisuke Kawamura, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1148 Po-805 A nalysis of bone erosions in rheumatoid arthritis using HR-pQCT: Evaluation of measurement accuracy and longitudinal change in bone erosions Kazuteru Shiraishi, et al., Dept. of Orthop. Surg., Nagasaki Univ. Graduate School of Biomedical Sciences…S1149 Po-806 R eal-world effectiveness of denosumab on clinical fracture reduction in patients with rheumatoid arthritis: ANSWER cohort study Koichi Murata, et al., Dept. of Orthop. Surg., Graduate School of Medicine, Kyoto Univ.…S1149 Po-807 A nalysis of affecting factor of rheumatoid arthritis to osteoporosis Tsutomu Sakuraba, et al., Dept. of Orthop. Surg., Hiraka General Hosp.…S1150

Poster RA 4: General 2

Po-808 ＊ S eropositive inflammatory arthritis occurring after immune checkpoint inhibitor treatment Yutaka Yokota, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1151 Po-809 C haracteristics of cases of very elderly onset rheumatoid arthritis treated at our hospital Kota Shimomura, et al., Dept. of Orthop. Surg., Sapporo Medical Univ.…S1151 Po-810 P redictors of glucocorticoid-free remission in patients with polymyalgia rheumatica treated with prednisolone Kyosuke Hattori, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1152

― 166 ― Po-811 C haracteristics of rheumatoid arthritis patients whose motivation was reduced by the influence of COVID-19 Yasumori Sobue, et al., Dept. of Orthop. Surg., Japanese Red Cross Nagoya Daiichi Hosp.…S1152 Po-812 I nvestigation of physical strength declining in patients with rheumatoid arthritis in the COVID-19 crisis Mochihito Suzuki, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1153 Po-813 E valuation of relevant factors for aggravation of cervical spine lesions in rheumatoid arthritis Tetsuhiko Inoue, Dept. of Orthop. Surg., Yokohama City Univ. Medical Center…S1153 Po-814 A ssociation between spinal alignment and lumbar spinal canal stenosis in patients with rheumatoid arthritis Shunsuke Ito, et al., Dept. of Orthop. Surg., Gunma Univ. Hosp.…S1154

Poster Medical safety, education & COVID-19

Po-815 H ip implant surgery for Jehovahʼs witnesses: Second report Shigeru Mitsuhashi, et al., Dept. of Orthop. Surg., Narashino Daiichi Hosp.…S1155 Po-816 I lizarov care programs in Akita Koji Nozaka, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S1155 Po-817 I nfluence of novel coronavirus (COVID-19) pandemic on orthopaedic practice: An experience in a general hospital at the center of Tokyo Masayoshi Saito, et al., Dept. of Orthop. Surg., St Lukeʼs International Hosp.…S1156 Po-818 D oes Coronavirus disease 2019 affect orthopaedic emergency? Wataru Endo, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1156 Po-819 T he problems of telephone-based outpatient service for orthopaedic diseases from a viewpoint of paramedical Kazunori Hayashi, et al., Dept. of Orthop. Surg., Osaka City Juso Hosp.…S1157 Po-820 R egarding sporting events and medical support in Corona pandemic: What is the usefulness of telemedicine in sports? Yoshihiro Nakamura, et al., Div. of Orthop. Surg., Univ. of Miyazaki…S1157 Po-821 I nfluence of COVID-19 pandemic on the musculoskeletal function of elementary and junior high school students based on musculoskeletal examinations Hiroshi Kamada, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S1158 Po-822 P CR screening of COVID-19 for hip fracture patients Shunji Kishida, et al., Dept. of Orthop. Surg., Seirei Sakura Citizen Hosp.…S1158 Po-823 L ive-web conference held in COVID-19 Hiroshi Satake, et al., Dept. of Orthop. Surg., Yamagata Univ.…S1159

Poster Infection 1: General

Po-824 C hanges in RFP, ST mixture, and MINO, GM susceptibility in MRSA-infected cases for 12 years: Application for treatment of MRSA osteomyelitis Yuhei Maki, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine, Yokohama Seibu Hosp.…S1160 Po-825 ＊ C hronological changes of bacterial incidence ratio in the surgical field of shoulder joint Hisahiro Tonotsuka, et al., Dept. of Orthop. Surg., Kanagawa Rehabilitation Hosp.…S1160 Po-826 I nfection rate after total knee arthroplasty significantly decreased by particular risk reduction Hiroaki Kijima, et al., Dept. of Orthop. Surg., Akita Univ. Graduate School of Medicine…S1161 Po-827 I ncidence rate and risk factors of surgical site infection after Danis-Weber type-B fractures of the distal fibula Natsuhiko Takata, et al., Dept. of Orthop. Surg., Nihon Univ.…S1161 Po-828 B rush cleaning and chlorhexidine disinfection suppress SSI in the foot Toru Kasai, et al., Dept. of Orthop. Surg., St. Marianna Univ. School of Medicine…S1162 Po-829 F inger rescue using induced membrane technique for osteomyelitis of the hand Takeyasu Toyama, et al., Dept. of Orthop. Surg., Kansai Medical Univ. Medical Center…S1162 Po-830 S urgical site infection after medial open wedge high tibial osteotomy Taro Yamashita, et al., Dept. of Orthop. Surg., National Defense Medical College…S1163

― 167 ― Po-831 E lution profile of anti-fungal agent from calcium phosphate cement Hiroki Hijikata, Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S1163

Poster Infection 2: Hip & spine

Po-832 P ositive rates and risk factors of local findings in hip infection compared with knee infection Takashi Imagama, et al., Dept. of Orthop. Surg., Yamaguchi Univ. Graduate School of Medicine…S1164 Po-833 T he risk factors of failed preservation or reimplantation arthroplasty in treatment of periprosthetic hip infection Hayato Suzuki, et al., Div. of Orthop. Surg., Dept. of Regenerative and Transplant Medicine, Niigata Univ. Graduate School of Medical and Dental Sciences…S1164 Po-834 I nfection risk of allograft treated with thermal disinfection in revision total hip arthroplasty Keiichi Kawanabe, Dept. of Orthop. Surg., Shiga General Hosp.…S1165 Po-835 C linical results of two stage treatment for chronic prosthetic hip joint infection Tetsuo Hayama, et al., Dept. of Orthop. Surg., The Jikei Univ. School of Medicine…S1165 Po-836 ＊ T he solution for bone destructive mechanism and suggestion of new target treatment for inhibition for destructive bone in pyogenic spondylitis Masafumi Machida, et al., Dept. of Orthop. Surg., Saitama Childrenʼs Medical Center…S1166 Po-837 A nterior spinal fusion for the treatment of pyogenic vertebral osteomyelitis Akimasa Yasuda, et al., Dept. of Orthop. Surg., National Defense Medical College…S1166 Po-838 C linical outcome of full-endoscopic lumbar discectomy for pyogenic spondylodiscitis Daiki Nakajima, et al., Dept. of Orthop., Tokushima Univ. Graduate School…S1167

Poster COVID-19

Po-839 I mpact of COVID-19 on orthopaedic surgery in our hospital Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1168 Po-840 I mpact of state of emergency due to COVID-19 infection on orthopaedic injury Hiroshi Okda, et al., Susumu Tamai Memorial Limb Trauma Center, Nara Medical Univ. Hosp.…S1168 Po-841 I mpact of COVID-19 to the occurrence of trauma Takashi Kurokawa, et al., Dept. of Orthop. Surg., Iwata City Hosp.…S1169 Po-842 C omparison of number of spinal surgeries between before and after epidemic of COVID-19 Kanichiro Wada, et al., Dept. of Orthop. Surg., Hirosaki Univ. Graduate School of Medicine…S1169 Po-843 T he effects of COVID-19 infection on osteoporosis outpatients Ryoma Hajino, et al., Dept. of Orthop. Surg., Showa Univ.…S1170 Po-844 D enosumab adherence in COVID-19 Kazuyoshi Kobayashi, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1170

Poster Survey, epidemiology & basic research

Po-845 ＊ T rend of the allogenic bone donors and hospitals Hiroyuki Izawa, Tokai Regional Bone Bank…S1171 Po-846 E pidemiological study for musculoskeletal diseases and dietary habits: Exploring the key to a healthy elderly person Taisuke Seki, et al., Musculoskeletal and Cutaneous Surg., Program in Integrated Medicine, Graduate School of Medicine, Nagoya Univ.…S1171 Po-847 W eb questionnaire survey in postoperative evaluation of pediatric congenital diseases Mitsutoshi Ota, et al., Dept. of Orthop. Surg., Faculty of Medicine and Graduate School of Medicine, Hokkaido Univ.…S1172

― 168 ― Po-848 A study of efficiency of orthopaedic surgery in the operating room Kengo Harato, et al., Dept. of Orthop. Surg., Keio Univ. …S1172 Po-849 T he insertion sites of the muscles attached to the clavicle: A cadaveric study for the clavicle fracture Hiroyuki Imazato, et al., Dept. of Orthop. Surg., Univ. of Miyazaki…S1173 Po-850 E xamination of bone remodeling: Comparison of two types of beta-tricalcium phosphate with different porous structures Naoya Kikuchi, et al., Dept. of Orthop. Surg., Univ. of Tsukuba…S1173

Poster Ultrasound

Po-851 ＊ U sefulness of intraoperative ultrasonography for thoracic outlet syndrome Taiki Morisako, et al., Dept. of Orthop. Surg., Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S1174 Po-852 T he role of the joint ultrasonography in patients with hemophilia Yuko Nakashima, et al., Collaborative Research Laboratory of Musculoskeletal Ultrasound in Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima Univ.…S1174 Po-853 U ltrasound-guided injection for iliopsoas impingement after total hip arthroplasty Takuro Ueno, et al., Dept. of Orthop. Surg., Graduate School of Medical Sciences, Kanazawa Univ.…S1175 Po-854 T o complete the operation with ultrasound guided nerve block in lower extremity surgery Takeshi Kashiwagura, et al., Dept. of Orthop. Surg., Akita City Hosp.…S1175

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