Patients from two studies : "Reproducibility of functional tests of the shoulder for the return to sport of patients operated on anterior instability of the shoulder "CPP n ° 2018-A03013-52 and "Validation of the S-STARTS composite score to assess the functions of the shoulder and the patient's ability to return to sport after stabilization of the shoulder by the Latarjet procedure (VAL-S-STARTS)" MR3016020520 healthy volunteers from two studies : "Reproducibility of functional tests of the shoulder for the return to sport of patients operated on anterior instability of the shoulder "CPP n ° 2018-A03013-52" and "Risk factors for shoulder dislocation in rugby players. Predictive validity of the S-STARTS composite score "MR4612110620  Inclusion criteria:  Patients: o patient between 15 and 45 years old  Occurrence of the injury requiring surgery during a sports activity Reduced shoulder instability by the open Latarjet procedure Surgery performed by surgeons from the Santy Orthopedic Center (Lyon) Inclusion by decision of the surgeon during the visit 4 months postoperatively  Healthy volunteers :  volunteer between 15 and 45 years old Practice a regular sporting activity  Both groups:  Patient having signed an informed consent Subject affiliated or beneficiary of a social security scheme  Exclusion Criteria:  Patient group:  Contraindication of the surgeon Have another pathology in the upper limbs Present a constitutional hyperlaxity Have stiffness or recurrence of dislocation of the shoulder post-surgery  Healthy volunteers :  Medical history of upper limb pain / injury within the past 12 months Medical history of orthopedic surgery on the upper limbs  Both groups:  Protected subject: adult under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision