Optimization of Skin Preparation to Reduce Cutibacterium Acnes Colonization in Superficial and Deep Samples During Prosthetic Shoulder Surgery in Male Patients

Inclusion Criteria: * Male patients, Adult patients, * Patient without a history of surgical intervention on the operated shoulder, * Patient managed for glenohumeral, partial (cup or anatomical hemi- arthroplasty) or total (anatomical or inverted) glenohumeral arthroplasty placement for primary osteoarthritis, or secondary to necrosis, massive rotator cuff tear or old fracture. * Patients affiliated to a social security system * Patients who have given their informed and written consent Exclusion Criteria: * Patient with arthroplasty for resumption of previous shoulder surgery or failure of arthroplasty * Patient with arthroplasty for acute trauma * Patient on immunosuppressantsimmunosuppressive drugs * Patient with inflammatory rheumatism * Patient with progressive cancer pathology * Allergies or intolerances concerning the modalities of selected skin preparations (Povidone Iodine, hypersensitivity to benzoyl peroxide) * Dermatological pathologies in the area to be treated * Acne treatment in the area to be treated within four weeks before inclusion * Patient without possible help from a third party for the application of Cutacnyl® 5% in the intervention group if necessary * Major under guardianship * Patient under the protection of justice * Patient not covered by social security