The effect of long versus short pectoralis minor resting length on scapular kinematics in healthy individuals
The effect of long versus short pectoralis minor resting length on scapular kinematics in healthy individuals
复制标题
DOI：
10.2519/jospt.2005.35.4.227
复制
发表时间：
2005-04-01
影响因子：
6.1
通讯作者：
Ludewig, PM
中科院分区：
文献类型：
--
作者：
Borstad, JD;Ludewig, PM
研究设计：两组比较。目的：比较以胸小肌静止长度区分的各组在手臂抬高过程中的肩胛骨运动学。背景：研究表明，肩峰下撞击症患者的肩胛骨运动学发生了改变，例如后倾消失和内旋增加。提出的这些改变的一种机制是适应性短胸小肌。如果适应性缩短，肩胛胸前肌可能会影响正常的肩胛运动学。方法和措施：将50名无肩痛的志愿者根据标准化胸小肌静息长度分为长组和短组。电磁运动捕捉系统在手臂抬高过程中在 3 个独立平面中确定肩胛骨、肱骨和躯干的角度方向。使用混合模型方差分析 (ANOVA) 比较各组在手臂仰角为 30 度、60 度、90 度和 120 度时相对于躯干的 3 维肩胛骨方向。结果：在手臂仰角的所有平面中，组和手臂仰角之间对于肩胛骨倾斜的交互作用具有统计学显着性，矮组的肩胛骨保持在较高角度向前倾斜。仅在冠状面的下臂仰角处，肩胛骨内旋也存在显着的相互作用，胸小肌较短的个体表现出肩胛骨内旋程度更大。结论：以胸小肌较短为特征的群体表现出的肩胛骨运动学与早期研究中肩部撞击受试者所表现出的运动学相似。这些结果支持这样的理论：适应性短的胸小肌可能会影响肩胛骨的运动学，因此是肩峰下撞击的潜在机制。 J Orthop Sports Phys Ther 2005；35：227-238。
Study Design: Two-group comparison.Objective: To compare scapular kinematics during arm elevation between groups distinguished by pectoralis minor resting length.Background: Studies have demonstrated that individuals with subacromial impingement have altered scapular kinematics, such as loss of posterior tipping and increased internal rotation. One proposed mechanism for these alterations is an adaptively short pectoralis minor. This anterior scapulothoracic muscle may impact normal scapular kinematics if adaptively short.Methods and Measures: Fifty volunteers without shoulder pain were divided into long or short groups according to normalized pectoralis minor resting length. An electromagnetic motion capture system determined the angular orientation of the scapula, humerus, and trunk during arm elevation in 3 separate planes. Groups were compared for 3-dimensional scapular orientation relative to the trunk at arm elevation angles of 30 degrees, 60 degrees, 90 degrees, and 120 degrees, using a mixed-model analysis of variance (ANOVA).Results: There were statistically significant interaction effects between group and arm elevation angle for scapular tipping in all planes of arm elevation, with the scapula for the short group staying anteriorly tipped at higher angles. There was also a significant interaction for scapular internal rotation at lower arm elevation angles in the coronal plane only, with individuals with a shorter pectoralis minor demonstrating a more internally rotated scapula.Conclusions: The group distinguished by a short pectoralis minor demonstrated scapular kinematics similar to the kinematics exhibited in earlier studies by subjects with shoulder impingement. These results support the theory that an adaptively short pectoralis minor may influence scapular kinematics and is therefore a potential mechanism for subacromial impingement. J Orthop Sports Phys Ther 2005;35:227-238.