Lateral ankle ligament injuries are very common, especially among basketball and soccer players. If it is not diagnosed and treated in time, it will lead to many secondary diseases, which will bring great inconvenience to daily life, study and work. Therefore, it is very important to make correct diagnosis and take effective treatment for patients with lateral ankle ligament injury in time. Clinical manifestations and diagnosis of lateral ankle ligament injury (a) history of injury must have a clear history of injury; physical examination can see localized swelling, ecchymosis, induration, and may have joint swelling. The reason why ligament injuries also cause joint swelling is that the lateral ligament of the ankle is woven together with the fibers of the joint capsule, so if torsion or violence causes ligament injuries, many patients will have joint capsule tears at the same time. Bleeding can enter the joint cavity through the tears in the joint capsule, which will lead to joint swelling and pressure pain. (ii) Physical examination of lateral ankle ligament injury: first, on the lateral side of the foot, below the ankle, draw three column-like strips (ligaments in the projection of the body surface), respectively, indicating the anterior talofibular ligament, the heel fibular ligament and the posterior talofibular ligament. The anterior talofibular ligament is the most prone to avulsion and rupture. This ligament can be identified by direct palpation. Ankle sprains are actually more than just a lateral ligament injury. If the violence is particularly high and energetic, ankle inversion can also result in injury to the inferior tibiofibular joint ligament, which is common in clinical practice. Treatment is complicated when the inferior tibiofibular coalition ligament is involved in addition to the lateral ankle ligament injury. The clinical diagnosis of an injury to the inferior tibiofibular coalition ligament must be confirmed, and if the diagnosis is missed and only injuries to the lateral collateral ligament are treated, the outcome of treatment will not be satisfactory. Squeeze test can help to identify whether the patient with ankle sprain is accompanied by injury to the inferior tibiofibular joint ligament, the method is: squeeze the calf muscle with both hands to the inside, and if there is ankle pain, it means that there is injury to the inferior tibiofibular joint ligament. (iii) X-ray examination may not be able to see the fracture line on a normal X-ray. X-rays of the foot and ankle need to be taken in a special or stress position. x-rays are of very limited value for ligaments as they are mainly for soft tissues to determine if there is any swelling. There are many films of the foot and ankle, and they should be taken selectively on a patient-by-patient basis in conjunction with the Ottawa Differential Diagnostic Criteria for Foot and Ankle Injuries to minimize unnecessary exposure to radiation and to reduce health care costs. However, the criteria are only applicable to skeletally mature adults and the injury is within 10 days. For patients with foot and ankle injuries, weight-bearing standardized anteroposterior, lateral, and ankle-point radiographs are mandatory. The main purpose of the ankle point films is to help identify whether the inferior tibiofibular joint ligament is injured. This is because the ability to confirm the diagnosis of an injury to the inferior tibiofibular ligament is critical to the overall treatment. (D) special examination in addition to X-ray examination, for foot and ankle injury, there are some special examinations, such as stress test: including internal and external rotation stress test and anterior and posterior stress test. 1, internal rotation stress test: when taking the film must be compared bilaterally, so that the foot is in the position of extreme inversion, film and measure the angle between the talar joint surface and tibial bone lower end of the articulating surface. It should not normally exceed 5 degrees. If the angle between the articular surfaces on the affected side is greater than 9 degrees or more on the normal side, it means that the lateral collateral ligament of the ankle joint on the affected side is damaged.2. Anterior-posterior stress test: check whether the foot can move forward, and how big the distance of movement is. Make the knee flexion 45 degrees (gastrocnemius muscle relaxation), the examiner holds the distal calf with one hand, the other hand holds the heel bone, pushes the foot forward, and checks the distance that the talus moves forward (as shown in the right figure). Of course the distance moved is so small (millimeter level) that it is not visible to the naked eye and can only be seen on an X-ray, before and after with or without force. The test is primarily an examination of the anterior talofibular ligament. Therefore, the inversion test primarily checks the stability of the anterior talofibular ligament and the calcaneofibular ligament, with the talus normally tilted no more than 5 degrees in the ankle cavity. If it is greater than 9 degrees contralateral compared to the opposite side, it has diagnostic value. The anterior-posterior stress test, also known as the anterior drawer test, examines the stability of the anterior talofibular ligament: a displacement of >3 mm on the affected side compared to the contralateral side is clinically significant. This must be measured accurately on radiographs. (v) MRI examination has obvious advantages for ankle ligament injuries compared with plain X-ray films, and can directly show the ankle ligament