跟腱扭转程度在影响局部应变大小方面与其长度和厚度相互作用：一项有限元分析。
Degree of twist in the Achilles tendon interacts with its length and thickness in affecting local strain magnitude: a finite element analysis.
作者信息
Enomoto Shota, Furuuchi Shunya, Ishibashi Tatsuki, Yamada Shu, Oda Toshiaki
机构信息
Institute for Promotion of Education and Campus Life, Okayama University, Okayama, Japan.
Graduate School of Science and Technology, Keio University, Yokohama, Japan.
出版信息
Front Bioeng Biotechnol. 2024 Oct 31;12:1445364. doi: 10.3389/fbioe.2024.1445364. eCollection 2024.
INTRODUCTION
The relationship between the twisting of the three subtendons of the Achilles tendon (AT) and local strain has received attention in recent years. The present study aimed to elucidate how the degree of twist in the AT affects strain using finite element (FE) analysis, while also considering other geometries (e.g., length, thickness, and width) and their combinations.
METHODS
A total of 59 FE models with different degrees of twist and geometries were created. A lengthening force (-axis) of 1,000 N was applied to each subtendon (total: 3,000 N). The average value of the first principal Lagrange strain was calculated for the middle third of the total length of the model.
RESULTS
Statistical (stepwise) analysis revealed the effects of the degree of twist, other geometries, and their combinations on AT strain. The main findings were as follows: (1) a greater degree of twist resulted in higher average strains ( = 9.28, < 0.0001) and (2) the effect of the degree of twist on the strain depended on dimensions of thickness of the most distal part of the AT ( = -4.49, < 0.0001) and the length of the AT ( = -3.82, = 0.0005). Specifically, when the thickness of the most distal part and length were large, the degree of twist had a small effect on the first principal Lagrange strain; however, when the thickness of the most distal part and length were small, a greater degree of twist results in higher first principal Lagrange strain.
CONCLUSION
These results indicate that the relationship between the degree of twist and local strain is complex and may not be accurately assessed by FE simulation using a single geometry.
引言
近年来，跟腱（AT）三条分支腱的扭转与局部应变之间的关系受到了关注。本研究旨在通过有限元（FE）分析阐明AT的扭转程度如何影响应变，同时考虑其他几何参数（如长度、厚度和宽度）及其组合。
方法
创建了总共59个具有不同扭转程度和几何参数的FE模型。对每个分支腱施加1000 N的延长力（-轴）（总计：3000 N）。计算模型总长度中间三分之一处的第一主拉格朗日应变的平均值。
结果
统计（逐步）分析揭示了扭转程度、其他几何参数及其组合对AT应变的影响。主要发现如下：（1）更大的扭转程度导致更高的平均应变（ = 9.28， < 0.0001），以及（2）扭转程度对应变的影响取决于AT最远端部分的厚度尺寸（ = -4.49， < 0.0001）和AT的长度（ = -3.82， = 0.0005）。具体而言，当最远端部分的厚度和长度较大时，扭转程度对第一主拉格朗日应变的影响较小；然而，当最远端部分的厚度和长度较小时，更大的扭转程度会导致更高的第一主拉格朗日应变。
结论
这些结果表明，扭转程度与局部应变之间的关系很复杂，使用单一几何参数的FE模拟可能无法准确评估。
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