The posterior tibiotalar ligament is a superficial component of the deltoid ligament complex that extends from the medial malleolus of the tibia to the posteromedial aspect of the talus. Its primary function is to provide medial ankle stability, resisting posterior talar translation and excessive external rotation of the ankle. Pathology typically occurs with severe ankle sprains, pronation–external rotation injuries, or chronic medial ankle instability, and may be identified on MRI as fiber dis