This Clinical Trial is being conducted to study an adjunctive treatment for rotator cuff repair; bone trephination. "Trephination" is a procedure that involves making small perforations in the bone that the tendon is repaired to. The rotator cuff is repaired by sewing the tendon down to the bone in the shoulder. Trephination is a new technique that is used in addition to the standard method of repairing the rotator cuff tendon. The control group will undergo the standard repair for rotator cuff tears.