The tibiocalcaneal ligament is one of the four ligaments that make up the deltoid ligament (also known as the medial collateral ligament). The deltoid ligament comprises the joint of the ankle that visibly protrudes from the lower leg. Of these four ligaments, one is a deep fiber, and three are superficial. The tibiocalcaneal ligament is one of the superficial fibers. The other ligaments are the anterior tibiotalar ligament, the posterior tibiotalar ligament, and tibionavicular ligament.
The purpose of these ligaments is to provide stability in the posterior (rear) foot. The tibiocalcaneal ligament runs between the medial malleolus (the part of the tibia that sticks out on the inside of the ankle) to the sustentaculum tali of the calcaneus, a part of the heel bone near the bottom of the ankle. This ligament is a small band of similar fibers that run parallel to the posterior tibiotalar ligament (deep layer of the deltoid ligament). The tibiocalacaneal ligament is a common site for injuries; in sports injuries involving the ankle, this ligament is torn 65 percent of the time.