Exploring the effect of displacement rate on the mechanical properties of denticulate ligaments through uniaxial tensile testing

IF 3.3 2区 医学 Q2 ENGINEERING, BIOMEDICAL Journal of the Mechanical Behavior of Biomedical Materials Pub Date : 2024-11-19 DOI:10.1016/j.jmbbm.2024.106824
Audrey Berriot , Morgane Evin , Karim Kerkouche , Elisabeth Laroche , Eva Gerard , Eric Wagnac
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Abstract

Denticulate ligaments play a key role in stabilizing the spinal cord (SC). Accurate representation of these structures in finite element modelling, whether in quasi-static or dynamic conditions, is essential for providing biofidelic responses. Therefore, understanding, characterizing and comparing the tensile mechanical properties of denticulate ligaments at different loading velocities is crucial. A total of 38 denticulate ligament samples at different cervical levels (anatomical levels from C1 to C7) were obtained from 3 fresh porcine SCs and 86 uniaxial tensile tests were performed immediately after dissection using an electro-mechanical testing system equipped with a 22 N loadcell. The mechanical tests included 10 cycles of preconditioning and a ramp with displacement rates of 0.1 mm s−1, 1 mm s−1 and 10 mm s−1. Bilinear piecewise fitting and trilinear piecewise fitting were performed to determine the elastic modulus and maximum stress and strainof the samples. While no significant differences in the mechanical behavior of the denticulate ligaments were found across the different displacement rates, notable variations were found between spinal levels, with a significantly higher elastic modulus at the lower cervical levels.

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通过单轴拉伸试验探索位移率对齿状韧带机械性能的影响
齿状韧带在稳定脊髓(SC)方面发挥着关键作用。无论是在准静态还是动态条件下,在有限元建模中准确表示这些结构对于提供生物保真响应至关重要。因此,了解、描述和比较不同加载速度下的齿状韧带拉伸机械特性至关重要。我们从 3 头新鲜猪 SC 上获取了不同颈椎级别(解剖级别从 C1 到 C7)的共 38 个齿状韧带样本,并在解剖后立即使用配备 22 N 负载单元的电动机械测试系统进行了 86 次单轴拉伸测试。机械测试包括 10 个周期的预处理和位移速率为 0.1 mm s-1、1 mm s-1 和 10 mm s-1 的斜坡。通过双线性片断拟合和三线性片断拟合来确定样品的弹性模量以及最大应力和应变。虽然在不同的位移速率下,齿状韧带的机械行为没有发现明显的差异,但在不同脊柱水平之间发现了明显的差异,颈椎较低水平的弹性模量明显较高。
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来源期刊
Journal of the Mechanical Behavior of Biomedical Materials
Journal of the Mechanical Behavior of Biomedical Materials 工程技术-材料科学:生物材料
CiteScore
7.20
自引率
7.70%
发文量
505
审稿时长
46 days
期刊介绍: The Journal of the Mechanical Behavior of Biomedical Materials is concerned with the mechanical deformation, damage and failure under applied forces, of biological material (at the tissue, cellular and molecular levels) and of biomaterials, i.e. those materials which are designed to mimic or replace biological materials. The primary focus of the journal is the synthesis of materials science, biology, and medical and dental science. Reports of fundamental scientific investigations are welcome, as are articles concerned with the practical application of materials in medical devices. Both experimental and theoretical work is of interest; theoretical papers will normally include comparison of predictions with experimental data, though we recognize that this may not always be appropriate. The journal also publishes technical notes concerned with emerging experimental or theoretical techniques, letters to the editor and, by invitation, review articles and papers describing existing techniques for the benefit of an interdisciplinary readership.
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