Treatment of traumatic radioulnar synostosis by excision, with interposition of a posterior interosseous island forearm flap.

A 21-year-old man had proximal radioulnar synostosis 10 months after fracture of the proximal radius and the ulna. The bony bridge was excised and a direct posterior interosseous island flap was interposed as a biological barrier. One year after surgery, the range of forearm rotation was 65 degrees. There was no radiographic evidence of recurrence.