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完整的腰椎模型的有限元分析:不同坐标系下的负载的影响
1Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology (IIEST), Shibpur, Howrah, West Bengal, India.
概括
在有限元分析中选择正确的坐标系对于准确模拟腰椎脊柱生物力学至关重要. 使用追随坐标系统 (FCS) 可以防止对脊椎的过度压力,与全球坐标系统 (GCS) 不同.
科学领域:
- 生物力学 生物力学
- 脊柱工程 脊柱工程
- 计算解剖学的计算解剖学
背景情况:
- 有限元素 (FE) 分析被广泛用于腰椎脊柱生物力学.
- 之前的研究采用了追随负载或姿势重心 (CG) 技术,但忽视了坐标系统的重要性.
- 在了解坐标系统如何影响脊柱负荷的FEA结果方面存在关键差距.
研究的目的:
- 为了比较跟随者坐标系统 (FCS) 和全球坐标系统 (GCS) 对腰椎运动范围 (ROM) 和应力-应变分布的影响.
- 要突出选择在脊椎的FEA中适当的加载坐标系统的重要性.
- 评估不同加载坐标系统在模拟生理运动中的准确性和安全性.
主要方法:
- 使用计算机断层扫描 (CT) 扫描,开发一个完整的腰椎 (L1-L5) 完整的有限元素 (FE) 模型.
- 通过FCS和GCS应用的负载条件下生理运动的模拟.
- 在两个坐标系之间分析和比较ROM和·米塞斯应变分布的变化.
主要成果:
- 在FCS和GCS之间的生理活动中,全L1-L5模型的最小ROM偏差为2.7°.
- 观察到的L3-L4功能脊柱单元的ROM变化范围从4.7°到19°.
- FCS导致·米塞斯菌株在0.0007和0.003之间,在骨范围内.
- GCS产生的峰值·米塞斯应变38.5%高于无骨的压力收益率应变极限.
- GCS导致了不对称的负载转移和潜在的骨衰竭风险,与FCS中的对称分布不同.
结论:
- 负载坐标系统的选择显著影响腰椎生物机械模拟.
- 与GCS相比,FCS提供了更准确,更安全的生理负载表示.
- 精确模拟脊柱生物力学需要仔细考虑坐标系,以及负载大小.
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