Posterior Tibial Tendon Rupture Associated With Anterolateral Distal Tibial and Medial Malleolar Fracture and a Novel Pattern of Tibiofibular Syndesmotic Injury: A Case Report and Review of the Literature

A posterior tibial tendon (PTT) rupture associated with ankle fractures is a very rare condition. Ankle pronation and external rotation (PER) movement are the typical traumatic mechanism. This injury is frequently overlooked preoperatively. Early diagnosis and treatment are very important to prevent the serious consequences related to functional PTT insufficiency on biomechanics of the foot. Few cases have been described in the literature that highlight the relationship between PTT rupture and PER type ankle fracture with a medial malleolar fracture. We present a case of a complete PTT rupture in a closed atypical ankle fracture in which a medial malleolar fracture was associated with a very large fragment from the anterolateral distal tibia (Tillaux-Chaput fragment) and a concomitant avulsion fracture from the anteromedial portion of the fibula (Lefort-Wagstaffe fragment), with a novel pattern never described before. © 2020 the American College of Foot and Ankle Surgeons.