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Symptomatic Os Subtibiale Associated with Chronic Pain Around the Medial Malleolus in a Young Athlete Alexandar A

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Symptomatic Os Subtibiale Associated with Chronic Pain Around the Medial Malleolus in a Young Athlete Alexandar A DOI: 10.1515/folmed-2016-0009 CASE REPORT Symptomatic Os Subtibiale Associated with Chronic Pain Around the Medial Malleolus in a Young Athlete Alexandar A. Iliev1, Georgi P. Georgiev1,2, Boycho V. Landzhov1, Svetoslav A. Slavchev3, Iva N. Dimitrova4, Wladimir А. Ovtscharoff 1 1 Department of Anatomy, Histology and Embryology, Medical University of Sofi a, Sofi a, Bulgaria 2 Department of Orthopedics and Traumatology, Queen Giovanna University Hospital, Medical University of Sofi a, Sofi a, Bulgaria 3 Prof. B. Boychev University Hospital of Orthopaedics, Medical University of Sofi a, Sofi a, Bulgaria 4 Department of Cardiology, St. Ekaterina University Hospital, Medical University of Sofi a, Sofi a, Bulgaria Correspondence: G. Georgiev, An os subtibiale is a rare accessory bone located below or behind the medial mal- Department of Orthopaedics and leolus. Herein we present a rare case of a painful os subtibiale in a young triathlete Traumatology, University Hospital who presented with pain, redness and swelling below his left medial malleolus. Queen Giovanna - ISUL, Medical Plain radiographs and three-dimensional computed tomography revealed a well- University of Sofi a, 8 Bialo more defi ned oval bone distal to the left medial malleolus. After conservative treatment St., BG 1504 Sofi a, Bulgaria E-mail: [email protected] failed, the ossicle was excised in an open surgery with complete resolution of Tel.: +359 884 493 523 symptoms. This case report emphasizes the need for clinical awareness of diff er- ent anatomical variations of the bones of the foot. Received: 23 Feb 2016 Accepted: 17 March 2016 Published: 30 April 2016 Key words: os subtibiale, ankle pain, surgery Citation: Iliev AA, Georgiev GP, Landzhov BV, Slavchev SA, Dimi- trova IN, Ovtscharoff WA. Symp- tomatic os subtibiale associated with chronic pain around the medial malleolus in a young athlete Folia Medica 2016;58(1);60-63, doi: 10.1515/folmed-2016-0009 INTRODUCTION after trauma or overuse it can become symptomatic A large number of accessory bones are located in and some patients might require treatment. the foot and ankle. Os subtibiale is a rare acces- In the present case report, we describe a young sory bone located distally or dorsally to the medial triathlete with a symptomatic os subtibiale who malleolus.1 It is considered a normal variant of the underwent open surgery. We discuss its character- medial malleolus where an articulating portion of istics from anatomical and clinical point of view. the medial malleolus is a separate ossicle.2 It is CASE REPORT thought that the os subtibiale originates as a fail- ure of fusion of a secondary ossifi cation center to An 18-year-old male triathlete presented with a sev- the medial malleolus or as a result of an avulsion eral months’ history of localized pain, redness and fracture. Most commonly it presents as a rounded swelling on the medial side of the left ankle after ossicle of variable size and is often found bilaterally. strenuous training. He trained intensively, three/four Most of the accessory ossicles are asymptomatic and times a week and had no history of ankle sprains are therefore found incidentally when assessing an on either side. Initially pain and swelling appeared injury or fracture to the ankle or foot.3 Although the only during physical exercise but gradually these os subtibiale does not often cause symptoms such were present even during everyday activities. as pain or limitation of motion at the ankle joint, On physical examination, we noted redness, 60 Folia Medica I 2016 I Vol. 58 I No. 1 I Article 9 Symptomatic Os Subtibiale Figure 1. a. Preoperative plain radiograph showing an os subtibiale of the medial malleolus; b. A three-dimen- sional computed tomography scan showed more accurately the characteristics of the ossicle and its dimensions; c. Postoperative plain radiograph confi rmed the excision of the os subtibiale. slight swelling, tenderness and pain on palpation the symptoms recurred and surgical treatment was in the distal portion of the medial side of the left therefore indicated. ankle. The point where pain was felt corresponded Surgery was performed through a direct medial to the location of the ossicle, but mobility of the approach. The ossicle was dissected free from its ossicle was not clear on palpation. There was a soft-tissue attachments and was excised entirely. slight difference in the range of motion between The deltoid ligament was preserved. The wound the right and the left ankle. was closed in the usual manner over a drain. The Plain radiographs visualized an oval bone excision was confi rmed on a postoperative radio- below the left medial malleolus on the anterior graph (Fig. 1c). The histological fi ndings revealed view (Fig. 1a) and a smaller oval bone below a chronic inflammatory reaction, with multiple the right medial malleolus. Three-dimensional CT lymphocytes, fi broblasts, fi brocytes and formation confi rmed the radiographic fi ndings and revealed of new blood vessels. A process of organization, a more accurate location and shape of the ossicles with formation of excessive fi brous tissue, especially (Fig. 1b). The os subtibiale in the left ankle was around the vessels and partial calcifi cation were 6 mm long and 4 mm wide. The patient initially observed (Fig. 2). Brace immobilization was used underwent conservative treatment which included postoperatively for 3 weeks. The patient was allowed rest, non-steroidal anti-infl ammatory drugs and to bear weight and to carry out muscle-stimulating physical therapy. Conservative treatment had a physiotherapy. About 7-8 weeks postoperatively, the good effect and pain was relieved initially. How- patient was allowed to engage in sports activities. ever, after the patient resumed intensive training, Follow-up after 8 months revealed normal clinical fi ndings and return to full function and level of competitiveness. DISCUSSION Accessory bones are often found in the foot. Apart from os subtibiale, these include the os trigonum4, the accessory navicular bone5, the os peroneum, the os supratalare6, etc. There is very little literature available on the accessory bone of the medial malleolus, the os subtibiale. The distal epiphyseal center of the tibia appears in the fi rst year of life and merges with the shaft at about the age of fi fteen in females and seventeen in males. The medial malleolus Figure 2. The histological fi ndings, revealing a chronic generally develops from the distal epiphysis, and infl ammatory reaction (HE x 200). ossifi es in the seventh year.7 Sometimes a separate 61 Folia Medica I 2016 I Vol. 58 I No. 1 I Article 9 A. Iliev et al ossifi cation center can be observed. An accessory minimally invasive.9 bone is formed when the separate epiphysis of In conclusion, the present case report demon- the medial malleolus fails to fuse with the distal strates the occurrence of the accessory os subtibiale tibia.8 A review of the literature showed that the in an 18-year-old male athlete. The presence of average size of the ossicle in symptomatic patients additional ossicles should be part of the differential is about 7 mm.1 We therefore think that it would diagnosis when assessing a patient presenting with be appropriate to differentiate the following two symptoms of pain, redness and swelling below the groups: type I os subtibiale with average size less medial malleolus, not only as a result of acute than 7 mm and type II more than 7 mm, with most trauma but also as a result of chronic intensive symptomatic cases being associated with the latter physical activity. group. Although the size of the additional ossicle in our case is less than 7 mm, the explanation for REFERENCES the presented symptomatic os subtibiale is a result 1. Kim JR, Nam KW, Seo KB, et al. Treatment for of the abnormal mechanical load of the ankle in symptomatic os subtibiale in a preadolescent athlete: active athletes. a report of 3 cases. Eur J Orthop Surg Traumatol Accessory ossicles of the medial malleolus can 2012;22(Suppl 1):229-32. form not only as a result of a secondary ossifi ca- 2. Bellapianta JM, Andrews JR, Ostrander RV. Bilateral tion center but due to avulsion injuries as well. os subtibiale and talocalcaneal coalitions in a col- The secondary ossifi cation center normally fuses lege soccer player: a case report. J Foot Ankle Surg with the distal portion of the tibia at the age of 2011;50(4):462-5. fourteen at latest.9 The presence of ossicles after 3. Ogden JA, Lee J. Accessory ossifi cation patterns this age is associated with avulsion injuries or and injuries of the malleoli. J Pediatr Orthop repetitive trauma caused by the increased mechani- 1990;10(3):306-16. cal load due to intensive physical activity. Also, 4. Slavchev SA, Georgiev GP. Os trigonum: a case calcifi cations in the deltoid ligament due to repeti- report of a symptomatic anatomical variation ant its surgical treatment. Rev Arg de Anat Clin tive microtrauma are often found in patients with a 2014;6(2):87-9. history of multiple ankle sprains. However, in our 5. Georgiev GP, Stokov L. Surgical treatment of the case, os subtibiale was present bilaterally, leading accessory navicular bone: case report. J Biomed to the conclusion that it developed as a result of Clin Res 2011;3(2):127-9. an unfused ossifi cation center rather than an avul- 6. Tsuruta T, Shiokawa Y, Kato A, et al. Radiologi- sion injury, as the patient did not report history cal study of the accessory skeletal elements in the of such trauma. Due to the nature of the sport he foot and ankle. Nippon Seikeigeka Gakkai Zasshi practiced, the intense physical activity led to the 1981;55(4):357-70.
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