Graduate School of Health Sciences, Sapporo Medical University, Sapporo, Japan.
Professional Post-Secondary Course (Physical Therapist), Sapporo Medical Technology, Welfare, and Dentistry Professional Training College of Nishino Gakuen School Foundation, Sapporo, Japan.
J Ultrasound. 2024 Sep;27(3):449-455. doi: 10.1007/s40477-022-00769-x. Epub 2023 Feb 7.
Intramuscular heterogeneity exists in the shear modulus of the rectus femoris (RF) muscle. However, the underlying heterogeneity mechanisms are not entirely understood. Previous research has reported that detachment of superficial tissues reduces the shear modulus by 50%. The aim of this study was to examine the effects of the skin, deep fascia, and intermuscular connections on the shear modulus of the RF at multiple sites.
Eleven donors were fixed using the Thiel method. Measurements were performed at 0°, 60°, and 120° knee flexion in a neutral hip position. Tissue processing was performed under four conditions: superficial tissue (CONT), skin off (SKIN), deep fascia detachment (FASC), and intermuscular connections detachment (ALL). The shear modulus at the proximal, central, and distal regions were measured using ultrasound shear wave elastography. The study was approved by the Sapporo Medical University Ethical Committee.
Three-way ANOVA revealed no significant interaction between treatment, site, and angle (P = 0.156), treatment and angle (P = 0.067), or site and angle (P = 0.441). There was a significant effect of treatment (P < 0.001), site (P = 0.010), and angle (P < 0.001) and interaction between treatment and site (P < 0.001). The proximal shear modulus was greater than the central for CONT. There were no significant differences between the measurement sites for SKIN. The distal shear modulus was greater than the proximal for FASC. The distal shear modulus was also greater than the proximal and central for ALL.
Intramuscular regional differences that influence superficial tissue and intermuscular connections of RF elasticity heterogeneity were observed.
股直肌（RF）的剪切模量存在肌内异质性。然而，其潜在的异质机制尚不完全清楚。先前的研究报告称，浅层组织的分离会使剪切模量降低 50%。本研究旨在检查皮肤、深筋膜和肌间连接对 RF 在多个部位的剪切模量的影响。
11 名供体采用 Thiel 法固定。在中立髋关节位置下，在 0°、60°和 120°膝关节弯曲时进行测量。在以下四种条件下进行组织处理：浅层组织（CONT）、皮肤切除（SKIN）、深筋膜分离（FASC）和肌间连接分离（ALL）。使用超声剪切波弹性成像测量近端、中央和远端区域的剪切模量。本研究得到了札幌医科大学伦理委员会的批准。
三因素方差分析显示，处理、部位和角度之间无显著交互作用（P=0.156），处理和角度之间也无显著交互作用（P=0.067），部位和角度之间也无显著交互作用（P=0.441）。处理方式（P<0.001）、部位（P=0.010）和角度（P<0.001）有显著影响，处理方式和部位之间也有显著交互作用（P<0.001）。CONT 时，近端剪切模量大于中央。SKIN 时，各测量部位之间无显著差异。FASC 时，远端剪切模量大于近端。ALL 时，远端剪切模量也大于近端和中央。
观察到影响 RF 弹性异质性的浅层组织和肌间连接的肌内区域差异。
