Preaxial polydactyly represents an embryologic failure of formation and differentiation that is most commonly classified according to the level of bony duplication. The soft-tissue anatomy and approach to reconstruction of a Wassel VI thumb, an uncommon variant in which complete duplication begins at the metacarpals has not been extensively discussed in the literature. Here, we present 2 patients with a Wassel VI duplication and a shared soft-tissue variant of anomalous insertion of the opponens pollicis muscle onto the radial hypoplastic digit. A critical component of thenar reconstruction involves preservation and reinsertion of the opponens muscle into the dominant and preserved metacarpal.
From the *Department of Surgery, Division of Plastic and Reconstructive Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, Calif.
†Division of Hand Surgery, Department of Orthopedic Surgery, Cedars Sinai Medical Center, Los Angeles, Calif.
Published online 5 November 2018.
Received for publication July 11, 2018; accepted September 14, 2018.
Disclosure: Dr. Kulber is a member of the Advisory Board for the Musculoskeletal Transplant Foundation. Dr. Munabi has no financial interest in any of the products, devices, or drugs mentioned in this article. Ms. Tanabe has no financial interest in any of the products, devices, or drugs mentioned in this article. The Article Processing Charge was paid for by the authors.
David A. Kulber, MD, Department of Orthopedic Surgery, Cedars Sinai Medical Center, 8635 W Third St, Suite 990W, Los Angeles, CA 90048, E-mail: David.firstname.lastname@example.org
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