Anterior interosseous nerve transfer to the motor branch of the ulnar nerve: a case report

High ulnar nerve lesions have a poor outcome; usually, there is some protective sensation and some recuperation of the forearm muscles but none of the intrinsic muscles. We report a case with a high ulnar nerve lesion and failed recovery, in which we transferred the anterior interosseous nerve (particularly the motor branch to the pronator quadratus muscle) to the motor branch of the ulnar nerve; this resulted in an excellent outcome.