A sprained ankle with lateral calf pain may be a sprained ankle causing tendon ligament injury or avulsion fracture. Ankle sprain is the ankle joint in sports more than its normal range of activities caused by ligaments, tendons and other joint soft tissue injuries, lateral ankle sprain may be concomitant with lateral calf pain, generally accompanied by calf pain sprain suggests that the degree of injury is larger, the involvement of tendons in a wider range. If the patient has a sprained foot lateral calf pain, need to consider the injury force is relatively large, the ankle tendon ligament damage is more serious, do not rule out the possibility of avulsion fracture. Avulsion fracture refers to the strong contraction or pulling of muscles, which makes the tendon or ligament attachment point of the bone part of the tear or peeling, which will cause pain in the calf. If a broken foot is accompanied by pain on the outside of the calf, the patient should go to the hospital in time for examination and consultation.