During sports, the loss of body weight for some reason, or stepping on someone else’s foot when jumping up and landing, or tripping on the foot during sports may produce a posterior rotation of the foot, causing injury to the lateral ligament of the ankle. Most patients, because there is no fracture after ankle sprain, neglect the treatment of lateral collateral ligament injury of the ankle, resulting in repeated ankle sprains and joint instability, also called habitual ankle subluxation. Ankle sprains are very common in sports injuries, the most common of which is a posterior rotation injury of the ankle, or lateral collateral ligament injury of the ankle. The goal of treatment of lateral collateral ankle ligament tears is to return the patient to pre-injury sports levels as quickly and to the greatest extent possible. For freshly torn lateral collateral ankle ligaments, mild to moderate, non-surgical treatment can be used, but should be more securely fixed in a cast and replaced with a walking cast or walking boot after 1 to 2 weeks, followed by the use of an ankle brace for 3 weeks for better results. For cases with severe torn ligament injury, significant joint instability, or combined fracture, and old ankle instability, surgical treatment is required. The torn ligament severed ends should be surgically sutured together; ligament stop reconstruction should be performed when the ligament is avulsed from the stop and direct suturing is difficult. When cartilage or osteochondral injury is suspected in the joint, arthroscopic exploration should be performed to repair the cartilage lesion and remove the joint free body. Postoperative plaster fixation should be performed for 3 weeks, and rehabilitation training such as joint mobility, muscle strength and proprioception should be started early.