The Influence of Repairing the Sub-scapularis on Outcomes After Reverse Arthroplasty

Inclusion Criteria: 1. Subject is ≥21 years of age 2. Subject is scheduled for reverse shoulder arthroplasty with the AltiVate Reverse device due to primary diagnosis of severe arthropathy with a grossly deficient rotator cuff 3. Subject's sub scapularis has been determined from MRI to be sufficient to repair 4. Subject is willing and able to comply with the study schedule and assessments 5. Subject is likely to be available for evaluation for the duration of the study 6. Subject is willing and able to sign the informed consent Exclusion Criteria: 1. Subject is indicated for reverse shoulder arthroplasty for other indications (revision arthroplasty, proximal humerus fracture, etc.), addition of latissimus transfer or pectoralis major transfer 2. Subject has metal allergies or sensitivity 3. Subject has an active infection at or near the site of implantation 4. Subject has a nonfunctional deltoid muscle 5. Subject has neuromuscular compromise condition of the shoulder 6. Subject has known active metastatic or neoplastic diseases, Paget's disease or Charcot's disease 7. Subject is currently on or planning to be on chemotherapy or radiation 8. Subject has had chemotherapy or radiation within the last 6 months 9. Subject is currently taking \> 5mg/day corticosteroids (e.g. prednisone), excluding inhalers, within 3 months prior to surgery 10. Female subjects who are pregnant or planning to become pregnant within the study period 11. In the investigator's opinion, the subject is unable to understand the study or be compliant with the follow up or has a history of non-compliance with medical advice 12. Subject has a history of any cognitive or mental health status that would interfere with study participation 13. Subject is abusing alcohol or drugs or is undergoing active treatment for substance abuse (e.g., recreational drugs, narcotics, or alcohol).