Screw bone is a dialect, is usually said ankle joint, ankle pain generally have the following reasons: for young people is the most common is the ankle sprain did not correctly deal with, especially after the first ankle sprain, no brake rest or without any treatment on normal walking. As the ligaments of ankle joint are stretched and elongated during sprains, resulting in ligament laxity and instability of ankle joint, ankle joint pain or repeated sprains will easily occur; for the elderly, ankle joint pain may be osteoarthritis, which is caused by degeneration of cartilage in the joints with the increase of age and proliferation of synovial tissues; if ankle joint is red, swollen, hot and painful, and it usually occurs in the night time or after drinking alcohol, it may be gouty joint pain, which may be the cause of ankle sprains. If the pain in the ankle joint occurs after a long period of exercise or after long-distance walking with localized pain and swelling, which affects the activities, it may be synovitis of the ankle joint. These are the common causes of screw bone pain.