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Fig. 3. —Schematic representation of Oden's surgical classification of superior peroneal retinacular injuries [4]. Normal indicates that superior peroneal retinaculum originates from distal fibula. Small fibrous ridge is noted. Type I indicates that superior peroneal retinaculum is stripped off distal fibula, forming pouch lateral to bone. Peroneal tendons can sublux or dislocate into this pouch. Type II indicates that superior peroneal retinaculum is avulsed of its distal fibular insertion. Type III indicates that superior peroneal retinaculum, along with small avulsion fragment, is avulsed off distal fibula. Type IV indicates superior peroneal retinaculum is torn off at its posterior attachment. PB = peroneus brevis tendon, PL = peroneus longus tendon, SPR = superior peroneal retinaculum.