[Transfer of the pronator quadratus to restore opposition of the thumb: An anatomic study and a clinical report].

The purpose of this study is to explore the feasibility of reconstructing the APB with a pedicled PQ flap, and to report results in a child presenting with bilateral radial deficiency. Twenty-one injected cadaver upper extremities were dissected. The muscle was pedicled distally on the transverse carpal artery, and reinnervated with the flexor digiti minimi (FDM) motor branch. The transfer was evaluated on 3 parameters: surgical feasibility, length of the distal pedicle and distance from the coaptation site to the muscle entry of recipient nerve. A bilateral PQ pedicled transfer was accomplished in a 17-month old child with bilateral radial deficiency. In the cadaver study, transfer of PQ to the APB was feasible and the distal end of the PQ transfer was reaching the radial side of the first metacarpophalangeal joint in all cases. The length of the distal pedicle on the transverse carpal artery was 38.5±0.20mm. The distance from coaptation of the FDM to the PQ muscle entry was 43.0±3.77mm. At 7 months, there was a cosmetic improvement of the thenar eminence, a bilateral M3 abduction of the thumb and a functional improvement from bilateral PQ pedicled transfer. Reconstruction of the APB may be achieved with a PQ pedicled transfer reinnervated, improving the function and the cosmetic aspect of the thenar eminence without sacrificing any function of the hand.

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