Soft tissue abnormalities in Wassel Type VI radial polydactyly: a detailed anatomical study

Author:

Saito Susumu1,Tsuge Itaru1,Yamanaka Hiroki1,Morimoto Naoki1

Affiliation:

1. Department of Plastic and Reconstructive Surgery, Kyoto University, Kyoto, Japan

Abstract

Wassel VI radial polydactyly is associated with metacarpal adduction and radial deviation of the metacarpophalangeal joint of the ulnar duplicate. The soft tissue abnormalities responsible for these deformities were characterized using preoperative multi-planar three-dimensional ultrasound and intraoperative observation in four patients. In all patients, the abductor pollicis brevis and superficial head of the flexor pollicis brevis inserted into the radial first metacarpal, whereas the adductor pollicis and deep head of the flexor pollicis brevis inserted into the ulnar thumb. Aberrant location of the flexor pollicis longus and absence of the A1 pulley system was associated with severe radial deviation. An additional superficial thenar muscle along the ulnar metacarpal was associated with minimal metacarpal adduction. Uneven forces on the ulnar duplicate could be associated with these characteristic deformities and joint instability. Knowledge of these abnormalities allows better planning of surgery and further insight into this rare radial polydactyly configuration. Level of evidence: II

Publisher

SAGE Publications

Subject

Surgery

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