A Multi-center Outcomes Clinical Study of the PyroTITAN™ HRA Shoulder Implant in Humeral Head Resurfacing

Inclusion Criteria: 1. Patients selected for inclusion will present for primary shoulder surface replacement or arthroplasty with any of the following diagnoses: * Osteoarthritis * Rheumatoid / Inflammatory Arthritis * Post-traumatic arthritis. * Focal and large (Hill-Sachs) osteochondral defects. 2. Subject is able to or capable of providing consent to participate in the clinical investigation. 3. Subject agrees to comply with this protocol, including participating in required follow-up visits at the investigations site and completing study questionnaires. 4. Subject is at least 21 years of age and skeletally mature at the time of surgery. Exclusion Criteria: 1. Have destruction of the proximal humerus to preclude rigid fixation of the humeral component. 2. Insufficient bone quality as determined by intra-operative evaluation. 3. Have arthritis with defective rotator cuff. 4. Have had a failed rotator cuff surgery. 5. Have loss of musculature, neuromuscular compromise or vascular deficiency in the affected limb rendering the procedure unjustified. 6. Have evidence of active infection. 7. Present with a condition of neuromuscular compromise of the shoulder (e.g., neuropathic joints or brachioplexis injury with a flail shoulder joint). 8. Are unwilling or unable to comply with a rehabilitation program or would fail to return for the postoperative follow-up visits prescribed by the protocol. 9. Are skeletally immature. 10. Have a known allergic reaction to pyrocarbon. 11. Have other conditions such as central nervous system disturbances, alcohol or drug addiction, etc. that may make effective evaluation of the joint replacement difficult or impossible. 12. Are currently participating in another clinical study. 13. Have known, active metastatic or neoplastic disease. 14. Are taking \> 10mg/day corticosteroids (e.g. prednisone) excluding inhalers, within 3 months prior to surgery. 15. Are under 21 years of age or over 75. . 16. Require glenoid replacement (Glenoid Classification).