Concomitant rupture of achilles tendon and superior peroneal retinaculum: a case report.

A case of a concomitant rupture of the Achilles tendon and superior peroneal retinaculum is presented. This combination of injuries has only been reported once in the available literature. The intraoperative findings revealed a mid-substance failure of the superficial peroneal retinaculum, which is also a rare finding. It is suggested that mid-substance failure of this structure be included within the existing classification scheme for superficial peroneal retinacular tears. The authors also discuss the probable pathoanatomical features of these combined injuries and a proposed mechanism of injury.