Neurotization of the Superficial Sensory Branch of Ulnar Nerve by the Distal Posterior Interosseous Nerve: Cadaveric Feasibility Study

Abstract

Background In 2014, Delclaux et al described a case wherein the Battiston and Lanzetta's technique, modified by utilization of the posterior interosseus nerve (PIN), was used to perform double neurotization of the ulnar nerve (UN). This study evaluates the feasibility of transfer of proprioceptive fascicles of the PIN to the superficial sensory branch of the UN (SSBUN).

Methods The surgeries were performed on 16 fresh cadaveric wrist specimens. PIN transfer was performed through the interosseous membrane and sutured to the SSBUN. The diameter for each nerve, number of fascicles, and the percentage of fascicles without axons, under ×10, ×40, and ×100 magnifications were performed by two observers.

Results Neurotization of the SSBUN by the PIN was successful in all cases. The median diameter of the SSBUN and PIN was 3.5 (3–4) and 2.3 mm (1.6–3), respectively. The SSBUN contained 5.5 fascicles (4–7), while the PIN contained 2 fascicles (0–4). The 16 PIN had limited (10 cases) or no axonal reserve (6 cases).

Conclusion This study supports the surgical and anatomical feasibility of neurotization of the SSBUN by the PIN. However, the PIN's limited axonal reserve may partially or totally compromise recovery.

Keywords

neurotization - ulnar nerve - nerve - posterior interosseous nerve - sensory - deficit

Funding

This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

Level of Evidence

The level of evidence is therapeutic IV.

Contribution of Authors

All the authors (P.L., L.D., S.D., C.A., M.E.T., M.C.S., and P.M.) certify that each author has participated in the content and design of the study, the preparation of the article and its revisions, and final approval.

Author's ORCID ID orcid.org/0000-0002-3019-9861.

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