New shoulder implant put to the test against standard replacement

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Adult subject 22 years or older * Clinical indication for total shoulder replacement due to osteoarthritis, and/or post-traumatic arthritis. * Scapula and proximal humerus must have reached skeletal maturity * Willing and able to comply with the protocol * Willing and able to sign the informed consent (or the Legally Authorized Representative will sign for the subject) Exclusion Criteria: * Lack of sufficient bone quality that in the Investigator's medical judgment could compromise implant fixation or bone healing, including conditions such as: * Rapid joint destruction, marked bone loss or bone resorption; * Destruction of the proximal humerus that precludes rigid fixation of the humeral component; and * Osteomalacia * osteoporosis * rheumatoid arthritis * Metal allergies or sensitivity, including a known allergic reaction to implant metals (e.g., nickel) or polyethylene * Patient presents with a malunion or non-union of the tuberosities of the proximal humerus. * Infection at or near the site of implantation, including: * Glenohumeral joint infection * Osteomyelitis * Distant or systemic infection * Medical conditions or balance impairments that could lead to falls * Prior Total, or Reverse Total Shoulder arthroplasty in the affected shoulder. * Prior failed rotator cuff surgery, but excluding successful shoulder arthroscopy * Any full thickness rotator cuff tear at the time of surgery or a nonfunctional rotator cuff * Excessive glenoid bone loss defined by preoperative computed tomography (CT) scans of the shoulder which show insufficient glenoid bone, or insufficient bone identified at the time of surgery * Metabolic disorders which may impair bone function * Nonfunctional deltoid muscle * Neuromuscular compromise condition of the shoulder (e.g., neuropathic joints or brachioplexus injury with a flail shoulder joint) * Patients diagnosed with severe shoulder instability * Patients diagnosed with subscapularis incompetence * Known active metastatic or neoplastic diseases, Paget's disease or Charcot's disease * Currently, or within the last 6 months, or planning to be on chemotherapy or radiation * Currently taking \> 5mg/day corticosteroids (e.g. prednisone) excluding inhalers, within 3 months prior to surgery or patients presenting with symptoms of chronic steroid use. (oral steroids for a chronic condition for 12 months prior to and including the date of surgery) * Female subjects who are pregnant or planning to become pregnant within the study period * In the surgeon's opinion, the subject is unable to understand the study or be compliant with the follow up or have a history of non-compliance with medical advice * History of any cognitive or mental health status that would interfere with study participation * Substance Use Disorder (alcohol and/or drug) * Engages in manual labor or sports activities that could affect shoulder outcome * Patients who have a work-related injury leading to shoulder OA * Currently enrolled in any clinical research study that might interfere with the current study endpoints * Patients with a life expectancy of less than three years * Medical condition or balance impairment that could lead to falls * Weight bearing shoulder due to wheelchair, crutches, rollator at the time of operation * Individuals who are incarcerated or detained in a correctional facility or under any form of legal supervision that limits their ability to voluntarily consent to participate in the trial. * Previous randomization of the subject in the current study.