Anatomic TSA Vs RTSA for Glenohumeral Arthritis

Inclusion Criteria: * Primary glenohumeral arthritis, * Intact rotator cuff, * No important glenoid bone loss (cf exclusion criteria), * Patients between 65 and 85 years old * Informed Consent as documented by signature (Appendix Informed Consent Form). Exclusion Criteria: * B2 glenoid with \> 80% posterior humeral head subluxation or greater 25 degrees neoglenoid retroversion, * B3 and C type glenoids, * Full thickness rotator cuff tear, * Acute or malunited proximal humeral fracture, * Chronic locked dislocation * Rheumatoid arthritis, * Revision surgery or surgical antecedents, * Tumors, * Axillary nerve damage, * Non-functioning deltoid muscle, * Glenoid vault deficiency precluding baseplate fixation, * Infection and neuropathic joints, * Known or suspected non-compliance, drug or alcohol abuse, * Patients incapable of judgement or under tutelage, * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, contraindication for CT scan etc. of the participant, * Enrolment of the investigator, his/her family members, employees and other dependent persons.