Sensitivity Specificity Positive Predictive Value Negative Predictive Value Supraspinatus Muscle Strength Testa 41.1% 89.5% 88.4% 46.8% Infraspinatus Muscle Strength Testa 41.6% 90.1% 90.6% 45.8% Gerber’s Lift Off Testb 18.8% 90.2% 50.0% 67.9% Brukhart’s Abdominal Compression Testc 76% 97% - -

Table 1: Diagnostic values of clinical tests for shoulder pathologies. a. Park HB, Yokota A, Gill HS, El Rassi G, McFarland EG (2005) Diagnostic Accuracy of Clinical Tests for the Different Degrees of Subacromial Impingement Syndrome. J Bone Joint Surg Am 87: 1446-1455. b. Fowler EM, Horsley IG, Rolf CG (2010) Clinical and arthroscopic findings in recreationally active patients. Sports Med Arthrosc Rehabil Ther Technol 2: 2. c. Goyal P, Hemal U, Kumar R (2010) High resolution sonographic evaluation of painful shoulder. Internet Journal of Radiology 12: 22.