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

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