Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Gent, Belgium.
Department of Orthopaedic Surgery and Traumatology, Ghent University Hospital, Gent, Belgium.
J Shoulder Elbow Surg. 2014 Jul;23(7):e158-62. doi: 10.1016/j.jse.2013.09.027. Epub 2013 Dec 15.
The balance between the subscapularis muscle and the infraspinatus/teres minor muscles, often referred to as the rotator cuff transverse force couple (TFC), has been proposed to be a critical component for normal shoulder function. The relationship between the muscle volume and the power means that TFC can be evaluated with the measurement of the muscle volume of the subscapularis muscle and the infraspinatus/teres minor. The aim of this study is to evaluate an innovative computed tomography (CT)-based technique to measure the muscle volume and to evaluate if there is a significant difference between muscle volumes of both the subscapularis muscle and the infraspinatus/teres minor in nonpathologic shoulders.
CT images of 27 shoulders (21 patients) with a full scapula and a proximal humeral head were evaluated. Two volume masks (subscapularis and infraspinatus/teres minor) were calculated on the basis of the assigned muscle contours on the transverse slices. The intraobserver and interobserver correlation coefficient was calculated.
The intraobserver and interobserver correlation coefficient was excellent. The correlation between the anterior and posterior part of the TFC was strong. There was no significant difference between the volume masks.
Muscle volume of the TCF can be quantified using CT images. In nonpathologic shoulders, there is no significant difference between the muscle volume of the anterior (subscapularis) and posterior part (teres minor/infraspinatus) of the TFC.
肩胛下肌与冈下肌/小圆肌的平衡，通常被称为肩袖横力偶（TFC），被认为是正常肩部功能的一个关键组成部分。肌肉体积与力量的关系意味着可以通过肩胛下肌和冈下肌/小圆肌的肌肉体积测量来评估 TFC。本研究的目的是评估一种基于 CT 的创新技术来测量肌肉体积，并评估在非病理肩中 TFC 的肩胛下肌和冈下肌/小圆肌的肌肉体积是否存在显著差异。
评估了 27 个全肩胛骨和近端肱骨头的肩部 CT 图像（21 名患者）。基于横切片上的分配肌肉轮廓计算了两个体积掩模（肩胛下肌和冈下肌/小圆肌）。计算了观察者内和观察者间的相关系数。
观察者内和观察者间的相关系数均为优秀。TFC 的前后部分之间的相关性很强。体积掩模之间没有显著差异。
可以使用 CT 图像对 TCF 的肌肉体积进行定量。在非病理肩中，TFC 的前（肩胛下肌）和后（小圆肌/冈下肌）部分的肌肉体积没有显著差异。
