The ligaments of the inferior tibiofibular articulation are oriented to prevent widening of the mortise. They are also important in preventing posterior displacement of the fibula at the syndesmosis, which tends to occur when the leg is forcibly internally rotated on the tarsus. It should be realized that complete sectioning of the inferior tibiofibular ligaments alone allows only a minimal increase in the intermalleolar space.1 This is because the two bones are indirectly held together by their mutual connections to the talus by way of the medial and lateral ligaments of the ankle. Significant diastasis, then, is usually accompanied by rupture of one or more of the talocrural ligaments, usually the deltoid ligament.