[Treatment of a radio-ulnar synostosis by resection and interposition of a septofascial flap--a case report].

Posttraumatic bone formation between radius and ulna can limit forearm rotation considerably. Recurrence after resection of synostoses is likely to develop if the bony surfaces are not covered by gliding soft tissue that is well vascularised. The interposition of a fascial forearm flap pedicled on the septal vessels of the posterior interosseous artery is suitable for this particular purpose. We report on the case of a spontaneous radioulnar synostosis by cartilaginous exostoses and its treatment by resection and interposition of a vascularised fascial flap. Forearm rotation was restored to normal. Until two years postoperatively there has been no recurrence of the synostosis.