assessment of correlation between mri and arthroscopic pathologic findings in the shoulder joint

background: the objective of this study was to determine the diagnostic value of magnetic resonance imaging for shoulder joint pathologies and then compare the results with arthroscopy, the standard for joint diagnosis. methods: in this cross-sectional study, 80 patients with shoulder joint disorders, who underwent final arthroscopy, were studied. based on patients’ medical history and physical examinations, shoulder mri was requested if paraclinical investigations were. if non-surgical therapies failed, arthroscopy of the affected shoulder was done and the same structures were inspected. subsequently, sensitivity, specificity, and positive and negative predictive values (ppv) and (npv) of mri were determined by arthroscopy comparisons. results: the highest sensitivity, specificity, ppv and npv were found in mri pathology reports that included: hill-sach lesion (0.910), infraspinatus tendon (0.985), supraspinatus tendon (0.930), and biceps tendon (0.954), respectively. rotator interval (0.250), biceps labrum complex (0.805), subscapularis tendon (0.538) and anterior labrum lesions (0.604) had the lowest sensitivity, specificity, ppv and npv, respectively. conclusion: the results showed that mri can be a useful tool in ruling out possible abnormalities in the shoulder and to give clues to the most probable diagnosis. although knowing some practical skills in order to successfully perform the procedure and experience of the radiologist with suitable feedback by surgeon is necessary.