Rupture of the flexor digitorum superficialis at the musculotendinous junction due to a forearm fracture: a case report.

We present a case of a closed distal-third forearm fracture, in which the flexor digitorum superficialis was found ruptured at its musculotendinous junction. We diagnosed the ruptured tendon during the exploration of the ulnar nerve for observed preoperative palsy. Although there are numerous reports about avulsions at the bony insertions, there are very few about avulsion at the musculotendinous junction in the literature. This consideration leads to the conclusion that this kind of rupture may be more frequent than recognized.