[TA] the part of the medial or deltoid ligament that extends from the medial malleolus to the sustentaculum tali of the calcaneus. SYN: pars tibiocalcanea ligamenti collateralis medialis articulationis talocruralis [TA], pars tibiocalcanea ligamenti deltoidei*, tibiocalcaneal part of deltoid ligament*, calcaneotibial ligament, ligamentum calcaneotibiale, tibiocalcaneal ligament.