起床过程中腰椎应力动力学响应

发布时间：2018-12-14 01:40

【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。
[Abstract]:Objective to reveal the stress response characteristics of lumbar intervertebral disc during waking up. Methods based on the experimental data, a finite element model of the lumbar vertebrae was established and verified considering the nonlinear and anisotropic properties of the material. The stress distribution and dynamic changes of the main structure of the lumbar vertebrae during the whole process of sitting on the edge of the bed. Results the stress size and distribution of the fibrous ring of lumbar intervertebral disc, nucleus pulposus and endplate of lumbar intervertebral disc were constantly changing during waking up. The stress of each segment was concentrated on the dorsal side, and the maximum stress appeared on L4F5, and the peak stress appeared when the trunk turned 35 掳~ 62 掳from supine. This was three times as high as sitting down and 17 times as high as when you were lying on your back. Conclusion there is a high incidence of injury and degeneration in the posterior side of L4M5 intervertebral disc, and the actual stress in daily activities may be higher and the influence range is larger than that measured by static state in the past. Dynamic simulation can provide scientific basis for the prevention and treatment of lumbar vertebra diseases by fully understanding the load characteristics of lumbar intervertebral disc.
【作者单位】：上海大学应用数学和力学研究所;
【基金】：国家自然科学基金项目(31370940)
【分类号】：R318.01;R681.5

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