Chronic peroneal tendon subluxation produced by an anomalous peroneus brevis: case report and literature review.

Although congenital anomalies of the peroneal muscles have been well documented from anatomical studies, only a single clinically symptomatic case has been previously reported. In the present report, a previously unreported variation of the peroneus brevis, a bifid peroneus brevis, is described. This variation contributed to chronic subluxation of the peroneal tendons. Diagnosis was made at the time of operation, and resection of the duplicated tendon and reinforcement of the peroneal retinaculum relieved the symptoms of the patient.