Pedicled Pronator Quadratus Transposition for Functional Opponensplasty: A Cadaveric Anatomical Study for Feasibility

Abstract

Background: Techniques on opponensplasty for chronic carpal tunnel syndrome have been described previously. A novel pronator quadratus (PQ) transposition for chronic carpal tunnel syndrome is described. In addition, the relationship of the distal perforating branch of the radial artery to the surrounding tissue is detailed to optimize further use of the PQ flap for clinical applications. Methods: Ten cadaver hands underwent PQ dissection, and the perforating branch of the radial artery was identified. Measurements were taken from the radiocarpal joint and the radial styloid to the distal perforating branch. Finally, a proposed surgical technique of PQ transposition with proximal radius periosteum to the first metacarpophalangeal joint and anterior interosseous nerve transfer was performed. Results: The average distance of the perforating branch from the radiocarpal joint was 10 ± 1.05 mm, and the average distance from the radial styloid was 17.1 ± 1.6 mm. Pronator quadratus transposed with a layer of radius periosteum demonstrated anatomical feasibility. Conclusions: The distal perforating branch of the radial artery predictably perfuses the PQ muscle, which may be used in the future as a means of opponensplasty for chronic carpal tunnel syndrome.