Simultaneous Use of the Anterior Interosseous Nerve as Both a Target and Donor Nerve in Radial to Median Nerve Transfers.

Abstract

Nerve transfers play a crucial role in the management of nerve injuries. I present a case where a young weightlifter had a devastating high median nerve injury resulting in absent thumb flexor pollicis longus function and absent flexor digitorum superficialis (FDS) and flexor digitorum profundus function of the index finger. An extensor carpi radialis brevis branch of the radial nerve was transferred to the anterior interosseous nerve (AIN), and the distal AIN was then mobilized and reflected from distal to proximal to supply a second nerve transfer to an FDS-index branch of the median nerve. In this configuration, the AIN served as both the target motor nerve for the first transfer and the donor nerve for the second transfer. The use of the AIN in this manner had the effect of minimizing donor morbidity (only 1 functioning donor nerve sacrificed) while also delivering an additional donor nerve to a target in an anatomically distinct area, avoiding sacrifice of additional donors or use of nerve grafts. The patient had full recovery of flexor pollicis longus function and flexor digitorum profundus index function at 10 months, as well as full recovery of FDS function of the index finger at 1.5 years postoperatively.