Fractured feet, also known as acute ankle sprains, are very common. Injuries to the lateral ankle structures are common, while injuries to the medial deltoid ligament are rare because the tension on the lateral ankle ligament is greatest in this location. The anterior talofibular ligament (ATFL) is the weakest of the three ligaments in the outer ankle and is most likely to be injured in ankle sprains, followed by the calcaneal ligament (CFL) and the posterior talofibular ligament (PTFL) is the least likely to be injured. If not treated correctly, chronic ankle instability can develop, which is characterized by chronic ankle pain, repeated ankle sprains, and ankle weakness. Patients are unable to walk on uneven surfaces, peroneal tendon pain, and impingement of the internal and external ankle spaces. Chronic external ankle instability refers to a series of functional states from functional instability to mechanical instability: 1. Functional instability refers to the presence of the above symptoms without clinical or radiological laxity; 2. Mechanical instability refers to the presence of the above symptoms along with clinical or radiological laxity. Patients with chronic ankle instability despite strict conservative treatment and functional rehabilitation have indications for surgical treatment. The surgical methods include: non-anatomical ligament reconstruction, anatomical repair and anatomical reconstruction. The anatomical repair and reconstruction of the ligament is preferred, which can better restore the biomechanics of the ankle joint: 1. 3.Ligament reconstruction under total ankle arthroscopy, and other lesions in the ankle joint can be treated at the same time.