medial talocalcaneal ligament medial talocalcaneal ligament the medial talocalcaneal ligament (internal calcaneo-astragaloid ligament) connects the medial tubercle of the back of the talus with the back of the sustentaculum tali. medial talocalcaneal ligamentligaments of the medial aspect of the foot.detailsfromtalustocalcaneusidentifierslatinligamentum talocalcaneum medialeta98a03.6.10.103ta21926fma44285anatomical terminology its fibers blend with those of the plantar calcaneonavicular ligament.