Post-traumatic or chronic unexplained pain in the ankle is a common condition in foot and ankle surgery clinics. The cause may be chronic instability after severe sprain of the ankle joint, talus cartilage fracture or limited necrosis of the talus, and other causes such as rheumatoid arthritis, osteoarthritis, gouty arthritis, and so on are also common. Many patients go to several hospitals without being able to confirm the diagnosis. Foot and ankle surgery can make a clear diagnosis through careful examination, using ankle arthroscopy to enter the joint through a tiny incision or using its advanced equipment, and then obtain good treatment. Among middle-aged and elderly patients with ankle pain, some of them are early manifestations of acquired flat feet. Although the foot is not deformed, if it is not treated in time, the late deformity will bring difficulties in treatment. Orthopedic surgeons are difficult to recognize such signs, you should see a foot and ankle surgery specialist, as early as possible to know what can be done and what can not be done. Delay the progression of the disease. According to clinical statistics, ankle sprains are one of the most common orthopedic emergencies, accounting for almost 10% of all emergencies. In sports injuries, 40% are ankle sprains, and basketball is 52%. Ankle sprains, the patient does not pay attention to, the general doctor is not too much attention, with a little Futenma, spray some medicine to let the patient go home. In fact, heavier ligament injuries are much more serious than fractures. The activity of the joints depends on the ligaments to maintain, the ligaments next to the joints rupture, the activity of the joints will be unstable. If ankle sprains are not treated properly, they can leave long-term ankle instability and ankle swelling, which is common in outpatient clinics. Roughly 20 to 30 percent of patients end up with long-term ankle pain and swelling, and some of these patients are the result of poor treatment in the early stages. Chronic joint instability can wear down the cartilage on the surface of the joint, which is non-renewable. When the cartilage is damaged, pain begins to develop, triggering inflammation of the joint. Gradually, joint deformity occurs. The deformity, in turn, aggravates the damage to the joint. In the early stages of ankle pain, braking, localized use or administration of anti-inflammatory and analgesic medications, physical therapy, and guided functional exercises may be used. If conservative treatment is ineffective, surgical treatment is required. Surgical treatment may include ligament and tendon reconstruction in the early stages, osteotomy in the middle stages, and ankle fusion or ankle replacement in the late stages.