Karduna Andrew R, Kerner Paul J, Lazarus Mark D
Department of Human Physiology, University of Oregon, Eugene, OR 97403, USA.
J Shoulder Elbow Surg. 2005 Jul-Aug;14(4):393-9. doi: 10.1016/j.jse.2004.09.001.
The purpose of this study was to examine the effects of scapular orientation on clearance in the subacromial space. Eight glenohumeral joints from fresh-frozen human cadavers were secured to an Instron mechanical testing machine via a custom-made translation table. Forces were applied to simulate rotator cuff and deltoid contraction. Superior translation of the glenohumeral joint was simulated, and the distance before the development of significant subacromial contact force was measured. Specimens were tested at varying orientations of scapular posterior tilting, upward rotation, and external rotation. Results demonstrated no significant effect of posterior tilting and external rotation. Subacromial clearance was found to decrease with an increase in upward rotation, which is contrary to what was expected. These results suggest that changes in upward rotation observed in patients with impingement syndrome may serve to open the subacromial space. Future work needs to focus on confirming these results and determining contact location.
本研究的目的是检验肩胛方位对肩峰下间隙内间隙的影响。取自新鲜冷冻人体尸体的八个盂肱关节通过定制的平移台固定到一台英斯特朗材料试验机上。施加力以模拟肩袖和三角肌收缩。模拟盂肱关节的向上平移，并测量在出现明显肩峰下接触力之前的距离。在肩胛后倾、上旋和外旋的不同方位对标本进行测试。结果表明，后倾和外旋没有显著影响。发现肩峰下间隙随着上旋增加而减小，这与预期相反。这些结果表明，撞击综合征患者中观察到的上旋变化可能有助于打开肩峰下间隙。未来的工作需要集中于证实这些结果并确定接触位置。
