The Deltoid Ligament
The deltoid ligament is a strong, flat, triangular band, attached, above, to the apex and anterior and posterior borders of the medial malleolus. It consists of two sets of fibers, superficial and deep. The most anterior of the superficial fibers (tibionavicular), passes forward and connects to the navicular bone. The superficial fibers combine with the medial margin of the plantar calcaneonavicular ligament. The calcaneotibial descend perpendicularly into the sustentaculum tali of the calcaneus. The posterior fibers are laterally attached to the inner side of the talus, and to the prominent tubercle on its posterior surface. The deep fibers (anterior talotibial) are attached, above, to the tip of the medial malleolus, and, below, to the medial surface of the talus. The deltoid ligament is covered by the tendons of the tibialis posterior and flexor digitorum longus.