A t the casualty department.. in Scandinavia, 7-10% of the injuries are ankle sprains. This injury is the most common injury in sports (13,20). Eightyfive percent of the sprains involve plantar flexion and supination. In 65% of the sprains, the injury is located only in the anterior talofibular ligament. With more violent inversion force, 20% also suffer damage to the calcaneofibular ligament. The calcaneofibular and the posterior talofibular ligaments are seldom r u p tured alone (14).Traditional sprains of the ankle have been classified into three grades. Grade 1 injury (mild) involves stretching of the ligament without macroscopic tearing, mild swelling, or tenderness, and no mechanical instability of the joint. Grade 2 injury (moderate) involves a macroscopic tear of the ligament with moderate pain, swelling, and tenderness, but no instability of the joint. Grade 3 injury (severe) involves a complete rupture of the ligaments with severe swelling and tenderness (6,10,13

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