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.[1]
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.
tibiocalcaneal descend almost perpendicularly to be inserted into the whole length of the sustentaculum tali of the calcaneus;
posterior tibiotalar from the posterior colliculus of the medial malleolus to the posteromedial surface of the talus
Deep fibres
The deep fibres (anterior tibiotalar) are attached from the anterior colliculus of the medial malleolus to the medial talus and medial tubercle
Coverings
The deltoid ligament is covered by the tendons of the tibialis posterior and flexor digitorum longus which are supplied by the tibial nerve (L4, L5, S1, S2, and S3).