Region-specific assessment of the mechanical properties of each hamstring muscle in human cadavers using shear wave elastography

IF 1.4 3区医学 Q4 ENGINEERING, BIOMEDICAL

Clinical Biomechanics Pub Date : 2025-06-06 DOI:10.1016/j.clinbiomech.2025.106586

Gakuto Nakao , Taiki Kodesho , Kazuma Yamagata , Risa Adachi , Koki Ishiyama , Kazuyoshi Kozawa , Kota Watanabe , Yuki Ohsaki , Masaki Katayose , Keigo Taniguchi

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引用次数: 0

Abstract

Background

Understanding regional mechanical properties of individual hamstring muscles is essential for accurately interpreting their functional behavior during elongation. However, how mechanical stress varies within muscles during elongation remains unclear. This study aimed to examine whether mechanical stresses differ among the hamstring muscles and at various regions within each muscle.

Methods

Fifteen cadavers were dissected to study the biceps femoris long head, semitendinosus, and semimembranosus muscles. Proximal and distal tendons were attached to a mechanical testing machine, and muscles were stretched from slack length to 8 % strain. Muscle length was measured with a tape measure, and anatomical cross-sectional areas at proximal (33 %) and distal (67 %) regions were determined using B-mode ultrasonography. Strain and stress were calculated to assess mechanical properties, and shear modulus was measured using shear wave elastography at the same regions.

Findings

A linear correlation between shear modulus and stress was found for all hamstring muscles (P < 0.01). Significant interactions among muscle, region, and strain were observed, with post-hoc tests revealing that the biceps femoris long head and semimembranosus had higher shear modulus than the semitendinosus after 0.5 % strain. The proximal biceps femoris long head showed increased shear modulus after 5 % strain, and proximal semimembranosus showed higher values after 0.5 % strain compared with the distal region.

Interpretation

The study findings reveal region-specific variations in the mechanical properties both among and within the hamstring muscles. Combining shear wave elastography with mechanical testing offers a non-destructive approach for characterizing these variations in passive muscle behavior.

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利用剪切波弹性成像对人体尸体中每条腿筋肌肉的力学特性进行区域特异性评估

背景：了解单个腘绳肌的区域力学特性对于准确解释其在拉伸过程中的功能行为至关重要。然而，机械应力在拉伸过程中如何在肌肉内变化仍不清楚。这项研究的目的是检查机械应力是否在腘绳肌和每块肌肉的不同区域有所不同。方法解剖15具尸体，研究股骨二头肌、长头肌、半腱肌和半膜肌。将近端和远端肌腱连接在机械试验机上，将肌肉从松弛长度拉伸至8%应变。用卷尺测量肌肉长度，用b超确定近端（33%）和远端（67%）区域的解剖横截面积。计算应变和应力以评估力学性能，并在同一区域使用横波弹性图测量剪切模量。发现所有腘绳肌的剪切模量与应力呈线性相关(P <；0.01)。观察到肌肉、区域和应变之间的显著相互作用，事后测试显示，在0.5%应变后，股二头肌长头和半膜肌的剪切模量高于半腱肌。近端股二头肌长头在5%应变后剪切模量增加，近端半膜肌在0.5%应变后剪切模量高于远端。研究结果揭示了腿筋肌肉之间和内部的机械特性的区域特异性差异。将剪切波弹性学与力学测试相结合，为表征被动肌肉行为的这些变化提供了一种非破坏性的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Clinical Biomechanics 医学-工程：生物医学

CiteScore

3.30

自引率

5.60%

发文量

189

审稿时长

12.3 weeks

期刊介绍： Clinical Biomechanics is an international multidisciplinary journal of biomechanics with a focus on medical and clinical applications of new knowledge in the field. The science of biomechanics helps explain the causes of cell, tissue, organ and body system disorders, and supports clinicians in the diagnosis, prognosis and evaluation of treatment methods and technologies. Clinical Biomechanics aims to strengthen the links between laboratory and clinic by publishing cutting-edge biomechanics research which helps to explain the causes of injury and disease, and which provides evidence contributing to improved clinical management. A rigorous peer review system is employed and every attempt is made to process and publish top-quality papers promptly. Clinical Biomechanics explores all facets of body system, organ, tissue and cell biomechanics, with an emphasis on medical and clinical applications of the basic science aspects. The role of basic science is therefore recognized in a medical or clinical context. The readership of the journal closely reflects its multi-disciplinary contents, being a balance of scientists, engineers and clinicians. The contents are in the form of research papers, brief reports, review papers and correspondence, whilst special interest issues and supplements are published from time to time. Disciplines covered include biomechanics and mechanobiology at all scales, bioengineering and use of tissue engineering and biomaterials for clinical applications, biophysics, as well as biomechanical aspects of medical robotics, ergonomics, physical and occupational therapeutics and rehabilitation.