Injuries of the lateral ligamentAnkle sprains usually occur on the lateral side because the joint capsule and ligaments are stronger on the medial side of the ankle. Mechanism injury of ankle sprain is inversion of the supinated , plantarflexed foot . It usually occurs when the foot rolls over on the outside of the ankle. When the ligament is completely torn or detached from the fibula, the talus is free to tilt in the mortice of the tibia and fibula.If the lateral ligament fails to heal, chronic instability of the ankle results.
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