Objective: To determine the incidence of injuries to the flexor and peroneal retinacula in hindfoot fractures as demonstrated on ankle computed tomography (CT).
Materials And Methods: Study patients were identified via review of CT records at a single institution. CT scans were retrospectively reviewed and compared with surgical reports.
Results: Hindfoot fractures undergoing CT showed flexor retinacular injuries in 23.7% of cases and peroneal retinacular injuries in 10.2%. The posterior tibial tendon was partly torn in 4.2% of cases, and entrapped between fracture fragments in 16.1%. The peroneal tendon was rarely injured, being entrapped in 1.7% of cases. Pilon, distal tibial shaft, malleolar, talar, and calcaneal fractures were all associated with retinacular injuries. CT findings correlated well with surgical findings; there were no false-positive CT findings, and only 1 false-negative finding, a posterior tibial tendon that was entrapped at surgery, but in a normal position on the CT.
Conclusions: Retinacular injuries are commonly demonstrated on CT in patients with ankle fractures. The contribution of these injuries to fracture outcomes is unknown.
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