Chronic Ankle Instability Return to Sport

Inclusion Criteria: * Age ≥ 15 years; * Patient treated at the European Sports Rehabilitation Center after a first arthroscopic surgery on the external lateral ligament of the ankle for chronic instability by anatomical reconstruction: * With tendon graft; * By suture with biological reinforcement; * Non-opposition of the patient and his/her parents (if minor) to the collection of his/her personal data. Exclusion Criteria: \- Minor patient (age \<18 years) not accompanied by one of his/her parents or legal representative during the inclusion visit; * History of surgery on the same ankle; * Associated complex osteochondral or internal ligament damage, syndesmosis, fracture; * Non-anatomical reconstruction; * Inability of the patient to understand the study protocol; * Vulnerable person whose inclusion is not justified by the purposes of the research: pregnant woman, person undergoing psychiatric care, or adult person subject to legal protection.