عنوان

مقایسه فضای ساب آکرومیال متعاقب خستگی عضلات کمربند شانه ای در زنان با و بدون شلی عمومی مفاصل از نگاه اولتراسونوگرافی

Objective: Generalized joint laxity (GJL) has been known as a pathological condition which can contribute to musculoskletal disorders. In the previous study there was no difference in muscle activity of shoulder girdle muscles of women with and without GJL. As Fatigue is a disturbance factor for normal muscular function so the objective of this study was to compare the effect of muscle fatigue on subacromial space and scapular kinematics in women with and without GJL. Materials and Methods: Thirty six asymptomatic women were classified with either GJL (beighton score>5) (n=20) and normal subjects (beighton score<5) (n=16) using beighton scale. Prior to and immediately after active elevation fatigue protocol the anterior outlet of the subacromial space was measured via the acromiohumeral distance (AHD) using ultrasound imaging with the arm at rest and 90 of active arm elevation. Scapular kinematics was assessed with both Scapular Dysikinesis Test and scapular lateral displacement test. Results: There were no differences in acromiuhumeral distance or scapular kinematics between groups. Following the performance of the fatigue protocol subjects demonstrated less AHD when arm was held in 90 of arm elevation furthuemore, after fatigue protocol scapular dyskinesis became more observable. But AHD when the arm was held at rest position and laterlal displacement measure did not change after fatigue protocol. Conclusion: Generalized joint laxity did not result in different AHD and scapular kinematics following fatigue. It seems further studies are needed to determine the effect of history of shoulder instability instead of hypermobility alone on shoulder girdle kinematics following shoulder fatigue. In adition like previous studies fatigue results in less AHD in arm elevation which may contribute to shoulder impingement syndrome. Keywords: Generalized Joint Laxity,shoulder, Ultrasonography, Acromiuhumeral Distance, Scapular Dyskinesis

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