فهرست نشریات علمی دسترسی آزاد ایران

Background: We use MRI to determine the mean acromiohumeral distance (AHD) in subacromial impingement (SI) and to identify which part of the subacromial space has the strongest effect on impingement. Objectives: To assess the association between AHD and SI and to determine which subacromial site most strongly correlates with impingement. Results: Mean AHDs in patients with SI were smaller than those of normal patients. Differences in the length of the lateral and central portions were statistically significant (P < 0.05). A 7.9-mm cutoff value at the lateral anterior portion showed 96% sensitivity and 43% specificity for SI. Cutoff values of 7.8 mm (reader 1, senior radiologist) and 7.5 mm (reader 2, junior radiologist) at the lateral posterior portion showed 89% and 78% sensitivity and 46% and 57% specificity, respectively. Conclusion: Patients with SI had narrower AHDs than patients without impingement, and specifically, the lateral and central portions of the acromion played an important role in the development of SI.