Accessory ossicle of the lateral malleolus.

The authors present a case history of a patient with chronic lateral ankle pain and instability secondary to an accessory ossicle of the fibula. Conservative therapy failed to alleviate the patient's symptoms, therefore surgical management was indicated. The ossicle was excised, and a modified, double-ligament lateral ankle stabilization procedure was performed. At 12-months follow-up, the patient is symptom-free.