Distal ulnar instability following wrist arthrodesis in men.

11 male patients with rheumatoid arthritis and 14 with osteoarthritis had total arthrodesis of the wrist. All patients with rheumatoid arthritis and ten (71%) of those with osteoarthritis had distal ulnar excision, two of the latter as a secondary procedure for impingement. Seven patients with osteoarthritis and none of the rheumatoid patients developed painful instability of the distal end of the ulna following excision. It is suggested that, in male patients with rheumatoid arthritis, distal ulnar excision with wrist arthrodesis produces excellent results with no complications. However, in male patients with osteoarthritis attempts should be made to avoid excessive shortening and ulnar impingement. If distal ulnar surgery is required, a procedure that does not affect the stability of the distal radio-ulnar joint should be performed rather than distal ulnar excision.