A Study Comparing Shoulder Replacement Techniques For Patients With Shoulder Arthritis And An Intact Rotator Cuff

The purpose of this study is to determine if patients undergoing anatomic total shoulder arthroplasty (aTSA) will have improved patient reported outcome scores at 1 year compared to those undergoing reverse total shoulder arthroplasty (rTSA).

Inclusion Criteria * Shoulder arthritis * Intact rotator cuff * Glenoid retroversion less than 25° Exclusion Criteria * Rotator cuff insufficiency * Fracture deformity/sequelae * Severe glenoid deformity (C glenoid, severe A2, B2 glenoid) * Current or previous infection of shoulder * Previous acromion fracture (not os acromiale) * Brachial plexopathy * Axillary neuropathy * Current drug or alcohol use or dependence that, in the opinion of the site investigator, would interfere with adherence to study requirements. * Inability or unwillingness of individual or legal guardian/representative to give written informed consent. * Medical conditions that would make 2 years follow up unlikely * Non-English speaking