the portion of the medial or deltoid ligament that extends from the medial malleolus to the neck of the talus.
The tibionavicular ligament is located in the leg and is a part of the deltoid ligament, which is the primary central ligament of the ankle joint. It connects the malleolus, or bony protrusion on the inside of each ankle, to tarsal bones of the foot (bones in the back half of the foot).