The lateral part of the talocalcaneonavicular joint is reinforced by the calcaneonavicular part of the bifurcate ligament, which is a Y-shaped ligament superior to the joint. The base of the bifurcate ligament is attached to the anterior aspect of the superior surface of the calcaneus and its arms are attached to: the dorsomedial surface of the cuboid (calcaneocuboid ligament), and the dorsolateral part of the navicular (calcaneonavicular ligament).