Traumatic dislocation of the peroneus longus tendon is an often unrecognized injury which has been reported to occur most commonly during sports activity. Most acute cases with early detection can be treated by simple repair of the tendon or retinaculum using one of several procedures available. Accurate treatment through a comprehensive evaluation of the ankle injury prevents suboptimal and sometimes unrecorrectable outcomes. The authors experienced concomitantly the peroneus longus tendon dislocation associated with a trimalleolar fracture of the ankle. We report this case a brief review of the literature.