Inclusion Criteria:  Ankle sports injury time> 6 months; age 18-50 years; no pain in daily activities, or a numerical rating scale (NRS) 6 points or less; no mechanical instability of the ankle joint and obvious restriction in joint movement ; agree to participate in this study.  Exclusion Criteria:  acute inflammation of lower limb joints; new or unhealed lower limb fractures; history of lower limb surgery within 3 months; lower limb pain caused by other diseases (such as lumbar disease, vascular disease, etc.); speech and cognitive impairment other diseases that cannot participate in this study.