Isolated traumatic posterior dislocation of the radial head: a report on two cases.

Posterior dislocation of the radial head without a fracture of the ulna in an adult is extremely rare. Two cases are presented in which the diagnosis was not made until 5 and 6 weeks respectively after the injury. In one case an open reduction and reconstruction of the annular ligament yielded a bad result. After excision of the radial head in the second case a good range of motion of the elbow was regained.