Distal anterior interosseous nerve transfer to the deep motor branch of the ulnar nerve for reconstruction of high ulnar nerve injuries.

Proximal ulnar nerve injuries can result in loss of intrinsic muscle function of the hand, and distal nerve transfers provide nerve coaptation close to the target muscle. This retrospective chart review evaluated patient outcome following a distal nerve transfer of the anterior interosseous nerve (AIN) to the deep motor branch of the ulnar nerve. There were eight patient charts reviewed, three women, and five men. The mean patient age was 38 years (standard deviation: 22 years). The mean time from injury to surgery was 3 months (standard deviation: 3 months), and mean postoperative follow-up time was 18 months (standard deviation: 11 months). All patients had reinnervation of the ulnar nerve intrinsic hand muscles with improved postoperative lateral pinch and grip strength. One patient had a secondary tendon transfer. No functional deficit in performing tasks in pronation was reported. The distal nerve transfer of the AIN to the deep motor branch of the ulnar nerve provides good reinnervation of the ulnar-nerve-innervated intrinsic muscles of the hand.