Dynamic Response of Idiopathic Scoliosis and Kyphosis Spine

doi:10.1007/s12204-023-2635-6

Abstract

Abstract: The dynamic response characteristics of scoliosis and kyphosis to vibration are currently unclear. The finite element method (FEM) was employed to study the vibration response of patients with idiopathic scoliosis and kyphosis. The objective is to analyze the dynamic characteristics of idiopathic scoliosis and kyphosis using FEM. The finite element model of T1—S1 segments was established and verified using the CT scanning images. The established scoliosis and kyphosis models were verified statistically and dynamically. The finite element software Abaqus was utilized to analyze the mode, harmonic response, and transient dynamics of scoliosis and kyphosis. The first four natural frequencies extracted from modal analysis were 1.34, 2.26, 4.49 and 17.69 Hz respectively. Notably, the first three natural frequencies decreased with the increase of upper body mass. In harmonic response analysis, the frequency corresponding to the maximum amplitude in x direction was the first order natural frequency, and the frequency corresponding to the maximum amplitude in y and z directions was the second order natural frequency. At the same resonance frequency, the amplitude of the thoracic spine was larger relative to that of the lumbar spine. The time domain results of transient analysis showed that the displacement dynamic response of each segment presented cyclic response characteristics over time. Under 2.26Hz excitation, the dynamic response of the research object appeared as resonance. The higher the degree of spinal deformity, the greater the fundamental frequency. The first three natural modes of scoliosis and kyphosis contain vibration components in the vertical direction. The second order natural frequency was the most harmful to patients with scoliosis and kyphosis. Under cyclic loading, the deformation of the thoracic cone exceeds that of the lumbar cone.

Key words: idiopathic scoliosis and kyphosis, thoracolumbar spine, dynamic response, time domain, finite element method (FEM)

摘要： 目前侧后凸脊柱对振动的动态反应特征尚不清楚。用有限元法研究了特发性侧后凸脊柱患者的振动响应。目标是分析特发性侧后凸脊柱的动态特征。用CT扫描图像建立T1—S1段的有限元模型，并进行验证。对建立的脊柱侧后凸模型进行静力学和动态验证。利用有限元软件ABAQUS对脊柱侧后凸模型进行模态分析、稳态分析和瞬态分析。从模态分析中提取的前四阶固有频率分别为1.34、2.26、4.49和17.69 Hz。值得注意的是，前三个固有频率随着上半身体质量的增加而降低。在稳态分析中，x方向最大振幅对应的频率为一阶固有频率，y方向和z方向最大振幅对应的频率为二阶固有频率。在相同的共振频率下，胸椎的振幅相对于腰椎的振幅更大。瞬时分析的时域结果表明，各段的位移动态响应随时间呈现循环响应特性。在2.26 Hz的激励下，研究对象的动态响应表现为共振。脊柱畸形程度越高，基频越高。侧后凸脊柱的前三阶模态都包含了垂直方向上的振动分量。二阶固有频率对脊柱侧后凸患者的危害最大。在循环载荷作用下，胸锥的变形超过腰椎。

关键词: 特发性脊柱侧后凸，胸腰椎，动态响应，时域，有限元模型

CLC Number:

R318.01

Li Pengju, Fu Rongchang, Yang Xiaozheng, Wang Kun. Dynamic Response of Idiopathic Scoliosis and Kyphosis Spine[J]. J Shanghai Jiaotong Univ Sci, 2025, 30(3): 482-492.

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