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Three volar dislocations of the distal ulna with unusual etiology were reported. The first case was a neglected volar dislocation of the ulna with a malunited fragment avulsed from the volar lip of the distal radio-ulnar joint. Satisfactory stability was achieved by open ulnar reduction with reposition and fixation of the malunited fragment. The second case suffered from volar dislocation of the distal ulna on supination. She had had a malunited Colles fracture with 5mm ulna plus variant and 30 degree dorsal tilt of the distal radius. Closing wedge osteotomy of the radius and shortening osteotomy of the ulna were done in order to realign the distal radio-ulnar joint. She regained painless pronation (60 degrees) and supination (90 degrees). The third case was a 13 year old boy who had a recurrent volar dislocation of the distal ulna which was possibly caused by shortening and angulation of the ulna secondary to growth disturbance of distal ulnar epiphysis due to trauma at 6 years of age. Physiological alignment of the distal radioulnar joint was achieved by opening wedge osteotomy of the ulna.

Volar Dislocation of Distal Ulna-A Report of Two Chronic Irreducible Dislocations and a Recurrent Dislocation Secondary to Epiphyseal Injury.