Cerrahpasa Faculty of Medicine, Department of Orthopaedics and Traumatology, Istanbul University, Kocamustafapasa, Istanbul, 34303, Turkey.
Skeletal Radiol. 2013 May;42(5):659-66. doi: 10.1007/s00256-012-1520-4. Epub 2012 Sep 21.
The aim of our study was to define and compare the mechanical properties of the vastus lateralis (VL) and vastus medialis obliquus muscles (VMO) by the way of quantitative shear-wave elastography in male and female healthy control (HC) subjects, and in female patients with patellofemoral pain syndrome (PFPS).
Twenty-two healthy volunteers (11 male and 11 female) and 11 female patients with anterior knee pain were included in the study. The SWE examinations for VL and VMO were performed while the subjects were performing open kinetic chain exercises in neutral and 30° hip abduction. The contraction capacity (CC) and contraction ratio (CR) values were determined in resting and contraction phases in both hip positions.
The mean elasticity values in the CC for VL and VMO muscles were significantly higher in male HC subjects when compared to female HC subjects (p < 0.05). The CR of the VL muscle in female patients with PFPS was not significantly different than the female HC group. The CR for the VMO muscle was significantly lower in female patients with PFPS when compared to female HC subjects (p < 0.05).
We found a significant VMO weakness, and this method may provide quantitative data that might influence the diagnosis of muscle weakness, in female patients with PFPS.
本研究旨在通过定量剪切波弹性成像（SWE）的方法，对男性和女性健康对照组（HC）以及女性髌股关节疼痛综合征（PFPS）患者的股外侧肌（VL）和股内斜肌（VMO）的力学特性进行定义和比较。
本研究纳入了 22 名健康志愿者（11 名男性和 11 名女性）和 11 名有膝关节前侧疼痛的女性患者。在进行中立位和 30°髋关节外展的开链运动时，对 VL 和 VMO 进行 SWE 检查。在两种髋关节位置的静息期和收缩期，分别确定收缩期容量（CC）和收缩比（CR）值。
与女性 HC 相比，男性 HC 组在 CC 时 VL 和 VMO 肌肉的平均弹性值显著更高（p<0.05）。PFPS 女性患者的 VL 肌肉的 CR 与女性 HC 组无显著差异。与女性 HC 相比，PFPS 女性患者的 VMO 肌肉的 CR 显著更低（p<0.05）。
我们发现 PFPS 女性患者存在 VMO 肌肉无力，这种方法可能为肌肉无力的诊断提供定量数据。
