Abstract
Separated ossicle at the tip of lateral malleolus, a rare condition called os subfibulare, sometimes is a cause of ankle pain. There are two theories regarding the origin of os subfibulare. One theory proposes that it is caused by an avulsion fracture attributable to pull of the anterior talofibular ligament, whereas the other theory proposes that it is the result of an accessory ossification center. Accessory bones may be stable or may sustain injuries and become avulsed. Most cases have described the surgical treatment of avulsion fractures with excision of the fragment and anterior talofibular ligament reconstruction. We describe a rare case of a symptomatic Os subfibulare caused by an accessory ossification center in a 27-year-old female with no previous history of trauma. Surgical excision was done without ligament reconstruction and the symptoms resolved completely after the surgery and there was no residual ankle instability.
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