Dislocation of the interphalangeal joint of the thumb.

A case of open dislocation of the interphalangeal joint of the thumb is presented. The anatomy of the injury is discussed as well as treatment options. In the 26-year-old male patient reported, hyperextension and rotation of the distal phalanx resulted in volar plate avulsion and ulnar displacement of the flexor pollicis longus. At operation the volar plate, which was blocking reduction, was repositioned through a dorsal incision as the flexor tendon was replaced in its correct position. Recovery has resulted.