The deltoid ligament (or medial ligament of talocrural joint) is a strong, flat, triangular band, attached, above, to the apex and anterior and posterior borders of the medial malleolus. The deltoid ligament supports the ankle joint and also resists excessive eversion of the foot. The deltoid ligament is composed of 4 fibers: Anterior tibiotalar ligament Tibiocalcaneal ligament Posterior tibiotalar ligament Tibionavicular ligament. It consists of two sets of fibers, superficial and deep..