Ankle - Joints and Ligaments
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Ankle Joint
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Ankle (Talocrural) Joint
- Is a hinge-type (ginglymus) synovial joint between the tibia and fibula superiorly and the trochlea of the talus inferiorly permitting dorsiflexion and plantar flexion.
Articular capsule
- Is a thin fibrous capsule that lies both anteriorly and posteriorly, allowing movement.
- Is reinforced medially by the medial (or deltoid) ligament and laterally by the lateral ligament, which prevents anterior and posterior slipping of the tibia and fibula on the talus.
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Ankle Ligaments
| Ankle
Medial (deltoid) ligament
- Has four parts: the tibionavicular, tibiocalcaneal, anterior tibiotalar, and posterior tibiotalar ligaments.
- Extends from the medial malleolus to the navicular bone, calcaneus, and talus.
- Prevents overeversion of the foot and helps maintain the medial longitudinal arch.
Lateral ligament
- Consists of the anterior talofibular, posterior talofibular, and calcaneofibular (cord-like) ligaments.
- Resists inversion of the foot and may be torn during an ankle sprain (inversion injury).
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