Study Comparing Patient Function and Satisfaction With Arthroscopic Subacromial Decompression Before and After Repair of Complete Rotator Cuff Tears

The investigators aim to establish whether completing a subacromial decompression before or after repair of a complete rotator cuff tear has any clinical significance. Both the arthroscopic decompression and rotator cuff repair will be completed during the same surgical date. The investigators null hypothesis contends that full-thickness rotator cuff tear repair performed before versus after subacromial decompression will not influence patient's post-operative pain or functionality.