Isolated traumatic dislocation of the distal end of the ulna or distal radio-ulnar joint.

Three of our five cases and approximately one-half the cases reported were misdiagnosed at the time of original injury. Increased awareness of this lesion and alertness to the relationship of the radius and ulna on lateral roentgenograms of the wrist would probably reduce the incidence of faulty diagnosis markedly.We believe that early closed reduction and adequate immobilization should result in excellent function in most cases. Delay in diagnosis will probably result in protracted disability and the necessity for surgical correction.