 A positive painful arc test result and positive external rotation resistance test result were the most accurate finding for detecting Rotator Cuff Disease; whereas the presence of a positive lag tests external or internal rotation result was most accurate for diagnosis of a full-thickness rotator cuff tear. Differentiating a full thickness tear from a partial tear, the most sensitive test was the belly-press test 56.8, and the most specific was the lift-off test 96.95. 