Background: Rotator cuff disorders are a leading cause of shoulder symptoms. Accurate imaging, detecting the typeof the involved muscle, and severity of the injury have important effects on the choice of treatment. Accordingly, thecurrent study was conducted to evaluate the
diagnostic accuracy of ultrasound for rotator cuff disorders in patientssuffering from shoulder pain and to explore the precision of ultrasound in determining the exact dimensions of a tear incomparison with magnetic resonance imaging (MRI).Methods: This prospective research was performed on patients clinically suspected of rotator cuff tendinopathy. Anultrasound of the shoulder was initially performed for the candidates. In this study, MRI was regarded as the modalityof choice for examining the images of shoulder disorders. The European Society of Musculoskeletal Radiology (ESSR)guidelines were used to design the protocols and implement imaging measures. Based on the reference standard ofMRI, the specificity and sensitivity as well as positive and negative predictive values of ultrasound in detection of rotatorcuff disorders were calculated.Results: A total of48 patients (22 women, 23 dominant right hands) with an average age of 51.6±8.3 years wereenrolled in this study. Based on MRI findings, rotator cuff disorders were detected in 43 patients (89.5%). The mostcommonly observed disorders were partial-thickness rotator cuff tear (n=17, 35.4%), full-thickness rotator cuff tear(n=16, 33.3%), and tendinopathy (n=10, 20.8%). Among rotator cuff disorders, the highest sensitivity of ultrasound wasobserved in the detection of full-thickness tear (93.7%) and rotator cuff tendinopathy (90%). The highest specificity wasfound in the detection of full-thickness rotator cuff tear (100%) and partial-thickness rotator cuff tear (96.7%).Conclusion: Based on our findings, ultrasound could be considered as a high-quality diagnostic tool to rule in partialand full-thickness rotator cuff tears and rule out the rotator cuff pathologies.Level of evidence: I