Ulnar shortening osteotomy in posttraumatic ulnar impaction syndrome.

Twenty-eight patients (average age 45 years) with posttraumatic ulnar impaction syndrome underwent ulnar shortening osteotomy of 3-15 mm. Contributing factors were malunited fractures of the distal radius in 20, diaphyseal fractures of the ulna and radius in 6, resection of the radial head and a traumatic tear of the triangular fibrocartilage in 1 patient each. Evaluation at an average follow-up of 20 months showed a high rate of satisfied patients (89%), but according to Chun's modification of the Gartland-Werley score there were 1 excellent (3.5%), 11 good (39.5%), 11 fair (39.5%) and 5 poor (17.5%) results. Degenerative changes of the distal radioulnar joint were associated with fair and poor results, and ulnar shortening osteotomy is only recommended in ulnocarpal impaction with an intact distal radioulnar joint. Osteotomy fixation with 3.5 mm dynamic compression plates enabled immediate postoperative mobilisation and resulted in a low complication rate. There was no advantage for the technically more demanding oblique as compared with a transverse osteotomy.