Sprains of the ankle joint, commonly known as broken feet, are the most common type of joint ligament injury in sports. It mostly occurs in basketball, soccer, long jump, high jump, running, skiing and skating. The ankle joint is not sufficiently prepared, too much force when running and jumping, improper posture when landing, and unequal ground. After the sprain, stop exercising, elevate the injured limb, apply cold compresses within 24-48 hours, and apply hot compresses after the swelling subsides. Recovery exercises. Ankle sprain is generally divided into three levels: Grade I: ligament stretching without laceration, slight swelling or pressure pain, slight functional impairment, generally needing 1 week to recover; Grade II: ligament suffering excessive pulling tension to partially tear the ligament, but the ligament is not completely ruptured. Moderate pain and swelling, reduced joint mobility, and joint instability. The joint needs to be fixed in a brace or cast. 2-3 weeks for recovery. Grade III: Complete rupture of the ligament with significant swelling, hematoma and pressure pain. There is functional impairment and joint instability. It is necessary to go to hospital for X-ray examination to exclude fracture. and surgical treatment. It usually takes 8 weeks or more to recover.