A Post-Market Clinical Evaluation of the ReUnion Reversible Fracture (RFX) System

Inclusion Criteria: * Subject is willing to sign the informed consent. * Subject is willing and able to comply with postoperative scheduled clinical evaluations. * Subject is male or non-pregnant female and 18 years or older at the time of surgery. * When used with ReUnion Total Shoulder Arthroplasty (TSA)Humeral \& Glenoid components as a Hemiarthroplasty or Total Shoulder Replacement, subject has one or more of the following: * Aseptic necrosis of humeral head; * Painful, disabling joint disease of the shoulder resulting from degenerative arthritis, rheumatoid arthritis or post-traumatic arthritis; * Proximal humeral fracture and/or dislocation; * Clinical management problems where arthrodesis or alternative reconstructive techniques are less likely to achieve satisfactory results; * Previous unsuccessful total shoulder replacement, resurfacing or other procedure * When used with ReUnion RSA Humeral \& Glenoid Components as a primary, fracture or revision total shoulder replacement, subject's joint has gross rotator cuff deficiency, a functional deltoid muscle and is anatomically and structurally suited to receive the implant, and subject has one or more of the following: * Painful, disabling joint disease of the shoulder resulting from degenerative arthritis or rheumatoid arthritis; * Proximal humeral fracture * Previously failed shoulder joint replacement Exclusion Criteria: * Subject has an active or suspected latent infection in or about the shoulder joint. * Subject has mental or neuromuscular disorder which would create an unacceptable risk of prosthesis instability, prosthesis fixation failure or complications in postoperative care. * Subject has bone stock compromised by disease, infection or prior implantation which cannot provide adequate support and/or fixation to the prosthesis. * Subject has anticipated activities which would impose high stresses on the prosthesis and its fixation. * Subject is obese such that he/she produces a load on the prosthesis which can lead to failure of fixation of the device or to failure of the device itself. * Subject has severe concomitant disease(s)which may significantly affect the clinical outcome. * For Total Shoulder Arthroplasty and Hemiarthroplasty: Subject has absent, irreparable or non-functioning rotator cuff and other essential muscles