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起床过程中腰椎应力动力学响应
引用本文:张涵,朱卫平.起床过程中腰椎应力动力学响应[J].医用生物力学,2017,32(4):348-354.
作者姓名:张涵  朱卫平
作者单位:上海大学 应用数学和力学研究所,上海大学 应用数学和力学研究所
基金项目:国家自然科学基金项目(31370940)
摘    要:目的揭示起床过程中腰椎间盘的应力响应特征。方法根据实验数据,建立并验证考虑材料非线性和各向异性属性的全腰椎有限元模型,在此基础上模拟并计算人体从仰卧、起身、左转到坐在床沿完整过程中腰椎主要结构的应力分布和动态变化情况。结果起床过程中腰椎间盘纤维环、髓核及终板的应力大小和分布不断变化,各节段的应力集中在背侧,L4~5上最大,应力峰值出现在当躯干从仰卧起转过35°~62°之时,分别是坐稳时的3倍、仰卧时的17倍。结论 L4~5椎间盘后侧是损伤和退变高发区,在日常活动中实际承受的应力可能要比以往按静态测算的应力更高,影响范围也更大。动力学模拟能更全面深入地了解腰椎间盘的负载特点,为防治相关腰椎疾病提供科学依据。

关 键 词:起床  腰椎间盘  动力学  有限元分析  应力
收稿时间:2016/9/17 0:00:00
修稿时间:2016/10/1 0:00:00

Dynamic respond of stresses in lumbar vertebrae during getting up
ZHANG Han and ZHU Wei-ping.Dynamic respond of stresses in lumbar vertebrae during getting up[J].Journal of Medical Biomechanics,2017,32(4):348-354.
Authors:ZHANG Han and ZHU Wei-ping
Institution:Shanghai Institute of Applied Math & Mech, Shanghai University and Shanghai Institute of Applied Math & Mech, Shanghai University
Abstract:Objective To reveal the characteristics of dynamic response from stresses in lumbar intervertebral discs during getting up. Methods A finite element model of lumbar vertebrae (L1-5) with consideration of nonlinear and anisotropic material properties was established and validated by comparing the experimental data. Based on this model, the complete process of getting up from supine lying, rising and turning left to sitting up on the bedside were simulated, and the distributions and dynamic changes of stresses in the model during getting up were calculated. Results The stress and its distributions in annulus fibrosus, nucleus pulposus, and endplate of lumbar vertebrae during getting up changed constantly. The stresses were mainly concentrated on the dorsal part of lumbar vertebrae, and the maximum stress was located at L4-5 intervertebral disc. Peak stresses occurred when the body trunk turned about 35° -62° from supine lying, which were 3 times and 17 times of those during sitting firmly and supine lying, respectively. Conclusion As a high incidence area of injury and degeneration, the dorsal part of L4-5 intervertebral disc in daily activities may be subjected to an extensive stress, which is higher than that predicted by static experiments and calculations. Dynamic simulation can help to further understand the loading characteristics of intervertebral discs and provide a scientific reference for prevention and treatment of related lumbar disease.
Keywords:Getting up  Lumbar intervertebral disc  Dynamics  Finite element analysis  Stress
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