Entrapment of the flexor digitorum profundus of the ring finger at the site of an ulnar fracture. A case report.

Entrapment of the ring finger flexor digitorum in the ulna following fracture of both forearm bones is very rare. Only three cases have been reported previously (Jeffrey, 1976; Rayan and Hayes, 1986). We report another case of such entrapment in an 8-year-old boy.