Inclusion Criteria:  Age ≥ 18 yr Clinical indication for anatomic primary total shoulder replacement due to osteoarthritis and/or posttraumatic arthritis Willingness and ability to comply with study protocol  Exclusion Criteria:  Medical condition or balance impairment that could lead to falls Prior rotator cuff surgery Cuff tear arthropathy/insufficient rotator cuff Insufficient bone quality which may affect the stability of the implant Neuromuscular compromise of shoulder or other disabilities affecting the maximum functional outcomes Weight bearing shoulder due to wheel chair, crutches, rollator at the time of operation Active metastatic or neoplastic disease at the shoulder joint Chemotherapy treatment/radiotherapy within 6 mo before surgery >5 mg/day of corticosteroids, excluding inhalers, within 3 years before surgery Pregnancy or plan to become pregnant during study period Inability to understand study or a history of noncompliance with medical advice Alcohol or drug abuse Current enrollment in any clinical research study that might interfere with this study Metal allergies or sensitivity. Previous or current infection at or near the site of implantation. Current distant or systemic infection Patient, whose infomed consent form should be taken in an emergency situation ONLY for women of childbearing age: a positive pregnancy test (urine / blood)