Anterior Interosseus Nerve Syndrome Masqueraded by a Functional Gantzer Muscle Variant: A Report of 3 Cases.

Authors

Cristian Escalera, Kartik Reddy, Darryl B Sneag, Carlo Milani, Ogonna Nwawka, Scott W Wolfe

Published in

JBJS case connector. Volume 16. Issue 3. Jul 01, 2026. Epub Sep 24, 2026.

Abstract

We present 3 patients with anterior interosseous nerve syndrome (AINS) who demonstrated thumb interphalangeal flexion despite complete denervation of the flexor pollicis longus. Advanced imaging revealed a Gantzer muscle in all cases that was confirmed at surgery in the 2 patients who required microneurolysis.
In patients with suspected AINS, retention of thumb IP flexion should prompt suspicion for a Gantzer muscle. Preservation or return of thumb flexion does not rule out AINS nor indicate recovery.

PMID:
42809643
Bibliographic data and abstract were imported from PubMed on 30 Sep 2026.

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