Repeated sprains of the ankle joint are very common in daily life, mainly manifested by the fact that the ankle joint is easily sprained when walking. This condition is usually ignored by patients and even some doctors, and simply considered as “soft tissue injury” without any treatment. In fact, recurrent ankle sprains, also known as “ankle chronic instability”, is a typical sports injury disease. This disease mostly occurs in young people and female patients, due to the fear of re-sprain and dare not walk on uneven surfaces, young women are afraid to wear high-heeled shoes to walk. In patients with recurrent ankle sprains, a follow-up history often reveals that the patient had significant ankle swelling and ecchymosis at the time of the first ankle injury. This presentation often represents a tear of the lateral collateral ligament, which maintains joint stability. Patients typically do not receive timely formal treatment after the first injury, or are treated inappropriately, resulting in the lateral collateral ligament not healing, making the ankle less stable and the ankle more susceptible to sprains. In subsequent repeated sprains, the ankle joint may not have obvious swelling or pain, but it is prone to secondary muscle atrophy around the ankle joint, intra-ankle impingement, ankle synovitis, and ankle cartilage damage, and leads to further decrease in the stability of the ankle joint, resulting in a vicious cycle, and ultimately, the formation of osteoarthritis of the ankle joint. Repetitive ankle sprains are difficult to diagnose by conventional tests such as X-rays and CT, and are usually determined by the physician’s clinical manual examination and the patient’s history. Treatment for recurrent ankle sprains varies depending on the severity of the condition. Mild recurrent ankle sprains are patients who have had their first ankle injury no more than six months ago, no more than two recurrent sprains, and no cartilage damage in the ankle joint. This group of patients can be treated by self rehabilitation exercises. The purpose is to increase the stability of the joint by exercising the strength of the outer muscles. The specific method is as follows: the affected foot is easy to step on the ground, the outside of the foot against the wall or hard objects, force the ankle joint to turn outward, feel the outer calf muscle force, maintain for 5 seconds, and then relax for 10 seconds. Cycle exercises, 20 times per group, 2 groups per day. You can also wear a professional ankle brace to enhance the stability of the joint during normal exercise. For patients whose conservative treatment is ineffective, surgical treatment is needed. Surgical treatment consists of two parts: 1. Clean up the inside of the ankle joint through minimally invasive arthroscopic surgery to remove hyperplastic synovial membrane and damaged cartilage fragments, and alleviate intra-articular symptoms. 2. Reconstructing the stability of the ankle joint. For professional athletes, patients with a long history of injury, patients who are overweight, or patients who will be required to participate in an adversarial sport in the future, a tendon graft instead of a ligament may be used, which is a very reliable way to reestablish the lateral stability of the ankle joint but is relatively more invasive; for the majority of patients, a modified Brostrum procedure with a delayed laxity of the ligaments will suffice, which is less invasive, and the procedure is less invasive. For most patients, a modified Brostrum procedure with delayed ligamentous laxity is sufficient, which is less invasive and more aesthetic. The modified Brostrum procedure with delayed ligamentous laxity is sufficient for most patients and is less invasive and aesthetically pleasing.