Finite element analysis of the cervical spine: dynamic characteristics and material property sensitivity study

松质骨 材料科学 流离失所(心理学) 生物力学 椎间盘 生物医学工程 软组织 变形(气象学) 颈椎 有限元法 材料性能 解剖 复合材料 医学 结构工程 外科 工程类 心理治疗师 心理学
作者
Yi-Tang Liu,Ruichun Dong,Zhong Liu,Xiang Gao,Shengjie Tang,Shi-Hong Yu
出处
期刊:Computer Methods in Biomechanics and Biomedical Engineering [Taylor & Francis]
卷期号:: 1-15 被引量:4
标识
DOI:10.1080/10255842.2024.2304285
摘要

The study aimed to investigate the dynamic characteristics of the cervical spine and determine the effect of the material properties of the cervical spinal components on it. A finite element model of the head-cervical spine was developed based on CT scan data, and the first six orders of modes (e.g. flexion-extension, lateral bending, and vertical, etc.) were verified by experimental and simulation studies. The material sensitivity study was conducted by varying elasticity modulus of cervical hard tissues (cortical bone, cancellous bone, endplates, and posterior elements) and soft tissues (intervertebral disc and ligaments). The results showed that increasing the elastic modulus of ligaments by 4 times increased the natural frequency by 77%, while increasing that of cancellous bone by 4 times only increased the natural frequency by 6%. In the axial mode, the cervical spine had not only axial deformation but also anterior-posterior deformation, with the largest deformation located at the intervertebral disc C6-C7. Decreasing the elastic modulus of a component in soft tissues by 80% increased modal displacement by up to 62%. The material properties of the intervertebral discs and ligaments had opposite effects on the modal displacement and deformation of the cervical spine. Low cervical discs were more susceptible to injury in a vertical vibration environment. Cervical spine dynamics were more sensitive to soft tissue material properties than to hard tissue material properties. Disc degeneration could reduce the range of vibratory motion of the cervical spine, thereby reducing the ability of the cervical spine to cushion head impacts.
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