Inclusion Criteria:  Men or women over 18 years old Patient with an indication of reverse prosthesis for cuff rupture, or eccentric omarthrosis, or omarthrosis without cuff rupture but with posterior eccentricity Patient with a normal subscapularis preoperatively Patient benefiting from a social protection insurance Patient having signed the free and informed consent  Exclusion Criteria:  Patient with an indication of anatomical prosthesis Patient with an abnormal subscapularis preoperatively Patient operated for a revision of prosthesis Patient with an indication for prosthesis on fracture sequelae Patient with an indication for prosthesis on fracture Patient participating in another clinical study Protected patient: adult under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision Pregnant, breastfeeding or parturient woman Patient hospitalized without consent.