Firstly, trauma can cause damage to the soft tissues of the ankle joint, resulting in swelling of the ankle joint, which can lead to a significant thickening of the ankle neck, which is accompanied by bruising and pain. Secondly, in patients with osteoarthrosis, the erosion of the ankle joint may also result in a thicker neck and affect the flexion, extension and weight-bearing activities of the ankle joint. Thirdly, it occurs in middle-aged and elderly people because of bone degeneration and hyperplasia in the ankle joint. In addition to the enlarged neck, it also causes pain when the ankle joint is flexed and extended and when weight-bearing activities are performed. A single symptom cannot accurately determine the cause of the disease, and if it has affected normal life should be promptly consulted.