髓核假体椎体单元的数值模型分析

C. Muller-Karger, N. Santoni, M. Matos, L. Zambrano
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摘要

本文基于文献中提取的尺寸,建立了L4-L5功能性椎体单元(FVU)的生理模型,并将其作为模拟髓核假体原型的平台。考虑外纤维环的各向异性和内髓核的不可压缩性,采用CAD计算工具和有限元模拟进行应力分析。在压缩载荷作用下,将FVU的力学性能与类似的无核模型进行了比较。数值结果表明,纤维环中有较高的位移和应力值,表明了核的重要性。该模型进行了修改,以包括使用三种不同形状的假体原型的初步设计:圆形,椭圆形和调整到外纤维环的几何形状,所有这些都是基于硅胶填充假体的概念。最后,结果表明,调整后的设计具有更好的抑制偏转性能。
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Numerical model of vertebral unit for the nucleus pulposus prosthesis analysis
This paper presents a physiological model of a L4-L5 Functional Vertebral Unit (FVU) based on dimensions extracted from the literature, which is used as a platform for simulation of Nucleus pulposus prostheses prototypes. CAD computational tools and finite element simulations were used for stress analysis considering the anisotropy of the outer annulus fibrosus, and the incompressibility of the inner nucleus pulposus. The mechanical behavior of the FVU is compared to a similar model without nucleus under compressive loads. Numerical results show higher displacements and stress values in the annulus fibrosus that show the importance of the nucleus. The model was modified in order to include tentative design of prosthetic prototypes of the Nucleus pulposus using three different shapes: circular, oval and adjusted to the outer annulus fibrosus geometry, all based on the concept of a Silicone gel-filled prostheses. Finally, the results show that the adjusted design has a better performance at restraining deflections.
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