Evaluation of Structural and Functional Integrity of the Rotator Cuff After Total Shoulder Arthroplasty

Inclusion Criteria: * age \>45yrs * primary diagnosis of osteoarthritis of the shoulder * total shoulder replacement performed by Dr. Armstrong * administered a local anesthetic mixture and not regional anesthesia * all genders * Fluent in written and spoken English * Patients capable of giving informed consent Exclusion Criteria: * Known contraindications to CT/EMG * Inability to provide informed consent * History of recent trauma to the shoulder * Atypical shoulder pain * Other suspected shoulder pathology (i.e. tumor, infection) * Pregnancy * Bilateral total shoulder arthroplasty