Ishii Orthopedic and Rehabilitation Clinic, 1089 Shimo-Oshi, Gyoda, Saitama 361-0037, Japan.,
J Ultrasound Med. 2014 Jan;33(1):111-7. doi: 10.7863/ultra.33.1.111.
The purpose of this study was to investigate the sonographic appearance of the pronator quadratus muscle in healthy volunteers.
We sonographically evaluated 30 healthy volunteers (15 men and 15 women). The maximum thickness of the pronator quadratus in millimeters on the volar side at the cortical level was measured on sagittal and axial sonographic images with the volunteers' hands supinated. On the axial image, we classified each hand according to the sonographic contour of the pronator quadratus.
A significant difference in the maximum pronator quadratus thickness between dominant and nondominant hands was shown on each image (P < .01). A comparison between men and women also showed a significant difference irrespective of image or hand dominance. Approximately 1.5 mm on the sagittal image and 1.4 mm on the axial image seemed to be adequate practical values for detecting pronator quadratus thickening. In terms of the pronator quadratus contour, the convex type appeared in most men in both the dominant and nondominant hands. In women, the convex and concave types appeared often in both the dominant and nondominant hands.
The difference in pronator quadratus thickness between dominant and nondominant hands might need to be taken into account during sonographic studies. However, in many cases, the difference seems to be slight and considerably less than the calculated cutoff value in this study. These results might be useful for sonographic comparison of bilateral pronator quadratus muscles in the clinical setting.
本研究旨在探讨健康志愿者中旋前方肌的超声表现。
我们对 30 名健康志愿者（15 名男性和 15 名女性）进行了超声评估。志愿者手部旋前时，在矢状面和轴面超声图像上测量掌侧皮质水平旋前方肌的最大厚度（以毫米为单位）。在轴面图像上，我们根据旋前方肌的超声轮廓对每只手进行分类。
在每种图像上，优势手和非优势手的最大旋前方肌厚度均存在显著差异（P<.01）。无论图像或手优势如何，男性和女性之间的比较也显示出显著差异。矢状图像上约 1.5 毫米和轴面图像上约 1.4 毫米似乎是检测旋前方肌增厚的足够实用值。就旋前方肌轮廓而言，优势手和非优势手的大多数男性均呈凸型。在女性中，优势手和非优势手的凸型和凹型经常出现。
在超声研究中，可能需要考虑优势手和非优势手之间旋前方肌厚度的差异。然而，在许多情况下，这种差异似乎很小，明显小于本研究中计算的截止值。这些结果可能有助于临床双侧旋前方肌的超声比较。
