Sidus Stem-Free Shoulder IDE Study

Inclusion Criteria: * Patient must be 22 years of age or older. * Patient is skeletally mature. * Patient must have signed the IRB/EC approved informed consent. * Patient is a candidate for a total shoulder arthroplasty (replacement of humeral head and glenoid). * Patient has a diagnosis of primary osteoarthritis of the shoulder of grade III or higher. * Patient has experienced symptoms of shoulder pain and/or loss of function for at least 6 months and has a maximum ASES score of 40. * Patient has no findings to indicate an etiology of acute trauma, infection, avascular necrosis or inflammatory arthropathy of the operative shoulder. * Patient has undergone no previous reconstructive shoulder surgery. Acceptable previous shoulder surgeries include arthroscopy, soft tissue repair, or pinning/screw fixation due to a historic fracture. * Patient is willing and able to comply with the required post-operative therapy as defined in the protocol. * Patient is willing and able to comply with the required follow-up schedule as defined in the protocol. Exclusion Criteria: * Patient is a prisoner. * Patient is a known current alcohol or drug abuser. * Patient has a psychiatric illness or cognitive deficit that precluded informed consent. * Patient has a chronic renal impairment or failure. * Patient sensitivity to implant materials. * Patient has a vascular insufficiency due to large or small vessel disease which could inhibit postoperative healing. * Patient is currently receiving or…