Objectives: The aim of the present study is to investigate the contribution of the coraco-acromial angle to the diagnosis of impingement syndrome.
Material and methods: The shoulder magnetic resonance images of 159 patients (96 females, 63 males) with impingement syndrome and 201 control cases (113 females, 88 males) from 2017 to 2019 were retrospectively evaluated. On the sagittal plane T2 weighted images, the shortest distances of humeral head to the acromion and the coracoid process, and the angle between longitudinal axis of the coraco-acromial ligament and longitudinal axis of the acromion were measured. To evaluate intra-observer reliability, all measurements were repeated two weeks later.
Results: The mean values of coraco-humeral distance, acromio-humeral distance and coraco-acromial angle were 8.39±5.97 mm, 8.07±4.00 mm and 123.45±11.10° in the patient group, and 10.32±2.52 mm, 10.69±2.19 mm and 124.75±6.95° in the control group, respectively. While there was a significant difference between patient and control group in terms of coraco-humeral and acromio-humeral distances (p 0.05). Elsewise, no correlation was found between impingement syndrome and coraco-acromial angle, since there were moderately negative correlations in terms of coraco-humeral and acromio-humeral distances.
Conclusion: Unlike the coraco-humeral and acromio-humeral distances, there was no correlation between coraco-acromial angle and impingement syndrome.
Key words: Impingement Syndrome, Magnetic Resonance Imaging, Coraco-acromial Angle
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