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.