Anaverse™ Glenoid System and Its Instrumentation

Inclusion Criteria: * Patient is 18-75 years of age, inclusive. * Patient is skeletally mature. * Patient is capable of understanding the doctor's explanations, following his instructions and is able to participate in the follow-up program. * Patient must have signed EC-approved informed consent. * Patient requires a primary reversed total shoulder arthroplasty or a conversion from anatomical to reversed to relieve pain and restore the joint function. * Patient has adequate quality and quantity of bone stock to support the prosthesis. * Patient meets at least one of the following indications: * Advanced wear and tear of the shoulder joint resulting from degenerative, posttraumatic or rheumatoid arthritis * Conditions consequent to earlier operations * Omarthrosis or Osteoarthritis * Rheumatoid arthritis * Total joint reconstruction following trauma * Patient has significant shoulder disability due to gross and irreparable rotator cuff deficiency. A functional deltoid muscle is necessary to use the device. * Patient underwent reverse total shoulder reconstruction with the Anaverse Glenoid System before the date of site initiation. * Patient has demographic, pre-operative evaluation, operative report and device information available. Specific inclusion criteria for Conversion from Anatomical to Reversed Configuration: * Surgery was performed with the Anaverse Glenoid System in a previously available anatomical configuration. * Irreparable rotator cuff with superior migration of the humeral head, leading to a reduction in sub-acromial space. * Superior tilt of the Anaverse Glenoid Baseplate not exceeding 15° compared to scapular axis. * No evidence of mechanical or fixation failure of the Baseplate, TM Pegs or DPSC Screws, obtained pre- or intra-operatively, which would compromise the success of the conversion surgery. Exclusion criteria: * Patient is unwilling or unable to give consent or to comply with the follow-up program. * Patient has any condition which would in the judgment of the Investigator place the patient at undue risk or interfere with the study. * Patient is known to be pregnant or breastfeeding. * Patient is a vulnerable subject (prisoner, mentally incompetent or unable to understand what participation to the study entails, a known alcohol or drug abuser, anticipated to be non-compliant). * Patient has any physical conditions that would impair adequate implant support and/or prevent the use of an appropriately sized implant. * Patient has any sign of infection (affecting the shoulder joint or in its proximity). * Patient has glenoid presenting with large defects due to erosion, which would lead to insufficient bony support or malalignment of the devices. * Patient is skeletally immature. * Patient has any sign of neuromuscular compromise (excluding rotator cuff tear). * Patient has vascular deficiency in the affected limb in sufficient degree to endanger the success of the intervention. * Patient has absence of musculo-ligamentous supporting structures. * Patient suffers from joint neuropathy or other conditions that may lead to inadequate skeletal fixation. * Patient has significant injury to the upper brachial plexus. * Patient has non-functional deltoid muscle. Specific exclusion criteria for Conversion from Anatomical to Reversed Configuration: * Unstable fixation of Baseplate after removal of PE Liner. * Superior tilt of Baseplate exceeding 15° compared to scapular axis * Superior malposition of the Baseplate which would prevent correct assembly of the Glenosphere. * Evidence of mechanical or fixation failure of the Baseplate, TM Pegs or DPSC Screws, obtained pre- or intra-operatively, which would compromise the success of the conversion surgery.