Inclusion Criteria:  Patient group :  Male patient Between 18 and 30 years-old Occurrence of the injury requiring surgery during a sports activity Reduction of shoulder instability by the Latarjet technique Surgery performed by surgeon from Santy orthopedic center (Lyon) Patient's inclusion by decision of the surgeon during the 4 months postoperatively visit  Healthy volunteer group :  Male patient Between 18 and 30 years-old Patient regularly practicing sport activity.  Both groups :  Patient having signed an informed consent Affiliated subject or beneficiary of a social security scheme  Exclusion Criteria:  Patient group :  Contra indication from surgeon Having another pathology in the upper limbs Present a constitutional hyperlaxity Have stiffness or recurrence of dislocation of the shoulder post-surgery  Healthy volunteer group :  Report a history of upper extremity pain / injury within the past 12 months Report a history of orthopedic surgery on the upper limbs  All participants :  Protected subject : adult under guardianship, guardianship or other legal protection, deprived of liberty by judicial or administrative decision pregnant woman, breastfeeding, parturient