Three-dimensional scapular orientation and muscle activity at selected positions of humeral elevation
Three-dimensional scapular orientation and muscle activity at selected positions of humeral elevation
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DOI：
10.2519/jospt.1996.24.2.57
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发表时间：
1996-08-01
影响因子：
6.1
通讯作者：
Nawoczenski, DA
中科院分区：
文献类型：
--
作者：
Ludewig, PM;Cock, TM;Nawoczenski, DA
肩胛骨运动学异常和相关的肌肉功能可能会导致肩部疼痛和病理。了解无症状个体的肩胛骨运动学和肌电图特征可以为病理学评估提供依据。本研究的目的是描述正常的三维肩胛骨方向和相关的肌肉活动在肱骨抬高。对25名19-31岁的无症状受试者进行了评价。数字化坐标数据和表面肌电图信号从上，下，肩胛提肌，前锯肌收集静态位置0，90，140度肱骨抬高肩胛平面。肩胛骨表现出逐渐向上旋转，内旋减少，以及随着肱骨仰角的增加从向前到向后的唇形位置的运动。所有肌肉的肌电图活动研究增加肱骨仰角。除了90度和140度肱骨角之间的下斜方肌外，所有变量在所有仰角下的平均值之间的差异都是显著的（p <0.05）。这项研究的结果表明，评估肩胛倾斜和内旋以及向上旋转可能是必要的，以了解与肩胛运动学异常相关的肩部病理。
Abnormal scapular kinematics and associated muscle function presumably contribute to shoulder pain and pathology. An understanding of scapular kinematic and electromyographic profiles in asymptomatic individuals can provide a basis for evaluation of pathology. The purpose of this study was to describe normal three-dimensional scapular orientation and associated muscle activity during humeral elevation. Twenty-five asymptomatic subjects, 19-31 years old, were evaluated. Digitized coordinate data and surface electromyographic signals from the trapezius (upper and lower), levator scapulae, and serratus anterior were collected al static positions of 0, 90, and 140 degrees of humeral elevation in the scapular plane. The scapula demonstrated a pattern of progressive upward rotation, decreased internal rotation, and movement from an anteriorly to a posteriorly lipped position as humeral elevation angle increased. Electromyographic activity of all muscles studied increased with increased humeral elevation angles. Differences between mean values at all elevation angles for all variables were significant (p < .05), except for the lower trapezius between the 90 and 140 degrees humeral angles. The results of this study suggest assessment of scapular tipping and internal rotation as well as upward rotation may be necessary to understand pathologies oi the shoulder that are related to abnormal scapular kinematics.