SMR Stemless Reverse vs SMR Reverse Shoulder System

Inclusion Criteria

• Age ≥ 22 years of age
• Skeletally mature as evident by scapula and proximal humerus closure
• Candidate for primary total shoulder replacement in a grossly rotator cuff deficient joint with severe arthropathy (disabled shoulder), when clinical indications based on physical exam and medical history including one or more of the following:

• Arthritis with rotator cuff tear not reparable
• Irreparable rotator cuff tear
• Rotator cuff tear arthropathy
• Severe osteoarthritis and rotator cuff deficiency or stiff shoulder
• Significant glenoid or socket side bone deformed or loss
• Reoccurrence of instability or a chronic shoulder dislocation
• Any other medical reason that the investigator determine that subject is a good candidate for a reverse total shoulder arthroplasty

Exclusion Criteria

• BMI > 40 kg/m2
• Previous contralateral shoulder surgery within 3 months of enrollment or that requires active treatment (i.e. surgery or brace)
• Had surgery in the targeted shoulder within last 12 months of enrollment, except diagnostic arthroscopy without procedures
• Had surgery in lower limbs (such as hip or knee) within last 6 months of enrollment
• Corticosteroid injections in the ipsilateral shoulder within 3 months of enrollment
• Complete deltoid muscle insufficiency
• Glenoid retroversion great than 25 degrees based off a 2D axial CT scan
• History of/or signs and/or symptoms of local or systemic infection including but not limited to septicemia; osteomyelitis
• Neurologically confirmed nerve lesion compromising shoulder joint function
• Poor meta-epiphyseal bone stock compromising stability of the implant including but not limited to humeral head fracture, iatrogenic glenoid fracture, severe osteoporosis
• Metabolic disorders which may impair fixation and stability of the implant including but not limited to uncontrolled diabetes mellitus with an HbA1C > 7.5%
• Extended bone loss after previous surgery defined as: complete bone loss of greater and lesser tuberosity
• Meta-epiphyseal bony defect (including large cyst)