Tibionavicular Part of the Male Medial Ligament, Medial View

Description

Medial ankle anatomy is centered on the tibionavicular part of the deltoid ligament (ligamentum mediale), drawn as a distinct band coursing from the anterior colliculus of the medial malleolus of the tibia to the medial surface of the navicular, adjacent to the tuberosity. The tibia descends superiorly into the ankle mortise, with the talus positioned inferior to the tibial plafond and the navicular lying distal and anterior to the talar head. Medial tarsal elements and the proximal metatarsals form the distal framework, while the fibula remains lateral and only partially relevant in this projection. Clear attachment points. That tibionavicular fascicle matters because it supports the medial side of the talonavicular and tibiotalar complex and resists hindfoot eversion and external rotation, the same mechanism that produces deltoid ligament injury in ankle fractures. Clinically, this is the band scrutinized when medial clear space widening on mortise radiographs suggests deltoid disruption, and it is directly encountered during open reduction and internal fixation of unstable ankle fractures when assessing medial stability. The medial perspective also clarifies why traction on the navicular in midfoot abduction can stress the deltoid complex, a practical teaching link for differentiating medial ankle sprain from true deltoid failure. Orthopaedic and sports medicine teaching files can pair this plate with mortise radiographs or MRI to localize deltoid injury patterns and to explain valgus tilt at the tibiotalar joint. It also fits lower-limb anatomy courses, podiatry curricula, and surgical atlases covering ankle fracture fixation, deltoid repair, and medial approach landmarks around the medial malleolus and navicular. Anatomical accuracy verified by SciePro's Medical Advisory Board.