Sprained Ankle - 1
Important The Ottowa Ankle Rules can save time, money and radiation - learn them.
Sprained ankle is a common injury, and causes significant morbidity and many workdays to be lost.The usual mechanism of injury is inversion of the foot.
Image Inversion injury 2
Mechanism of injury
This puts strain on the ligaments particularly those on the lateral side of the ankle - from the end of the fibula to the talus.
Image Talofibular ligaments
Sometimes this can cause the lateral malleolus to break, as shown here with a dark line across the lateral malleolus.
Image Ankle fracture
More commonly however, the ligaments are sprained. This means that some of the ligaments are torn. The weakest is the anterior talofibular ligament