In approximately 15% of cases of brachial plexus injuries (BPI), posttraumatic deficits are limited to the C5 and C6 roots territory. Historically, sural nerve grafts or branches of the radial nerve have been transferred to the anterior division of the axillary nerve to restore shoulder abduction. This chapter aims to review the techniques and outcomes associated with the nerve transfer of motor fascicles from the ulnar or the median nerve to reinnervate the deltoid. In general, the few series that evaluated the results of shoulder abduction and forward flexion associated with median or ulnar nerve fascile transfer reported satisfactory outcomes. However, such results must be carefully considered, given the small number of reported cases and the lack of comparative or controlled studies.