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Department of Orthopaedic Surgery, UCLA School of Medicine, Los Angeles, California
Department of Orthopaedic Surgery, UCLA School of Medicine, Los Angeles, California
Department of Orthopaedic Surgery, UCLA School of Medicine, Los Angeles, California
We studied 62 patients (40 men and 22 women) with an average age of 28 years over a 28-month period who presented with shoulder pain that was refractory to 3 months of conservative management. Patients with a prior glenohumeral dislocation or a rotator cuff tear were excluded. The "crank" test was performed with the arm elevated 160° in the scapular plane of the body, loaded axially along the humerus, and with max imal internal and external rotation. Although similar tests have been described, the crank test is a new examination previously unreported. Half of the patients (31) had a positive crank test. Arthroscopy performed on all 62 patients revealed glenoid labral tears in 32 patients. Two patients who had positive crank tests did not have labral tears but had partial-thickness, articu lar-side rotator cuff tears. The sensitivity of the crank test was 91%, the specificity was 93%, the positive predictive value was 94%, and the negative predictive value was 90%. With these data, the crank test fulfills the criteria as a single physical examination test that is highly accurate for the preoperative diagnosis of gle noid labral tears. Accordingly, expensive imaging mo dalities currently used in this patient population may be employed less in the future.
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