A 19-year-old baseball player was referred for assessment of recurrent sprains of the right ankle. This was found to be secondary to a palsy of the common peroneal nerve that was compressed by an osteochondroma of the fibular neck. The lesion was resected from the fibula and the patient made a complete recovery. We present this case as an example of a rare underlying problem in a patient who was initially diagnosed as having a sports-related ankle injury.
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