3.0T MR imaging of shoulder impingement syndrome

Objective To explore the diagnostic value of 3.0T MRI in shoulder impingement syndrome(SIS),and to observe the imaging features and injuring mechanism of SIS.Methods Thirty patients of SIS underwent MRI,and the imaging findings and clinical symptoms were reviewed retrospectively.Results Theanatomical structures and abnormal changes of shoulder were excellently demonstrated with 3.0T MRI.①Direct signs:Supraspinatus tendon illustrated signal and patterns changes in all 30 patients,while supraspinatus tendon full-thickness tears were detected in 6 patients;Partial-thickness tears were found in 13 patients,abnormal and mixed signals on the surface of the muscle tendon were found in 11 patients.②Indirect signs:Subacromial bursa thickening,subacromial-deltoid sac fluid and the joint capsule fluid were signs of supraspinatus tendon tears.③Secondary signs included joint labrum avulsion,the supraspinatus muscle atrophy and the deltoid muscle atrophy and Bankart Lesion.④Etiological signs:Acromino were classified as flat,smoothly curved and hooked.AHI5 mm(7/30)and between 5-10 mm(23/30).Conclusion 3.0T MR can effectively demonstrate imaging features in SIS and provide information to guide the protection and rehabilitation of shoulder function.