Topology optimisation of spinal interbody cage for reducing stress shielding effect

Computer Methods in Biomechanics and Biomedical Engineering
Hun Guan ChuahMohd Imran Yusof

Abstract

The stress shielding effect is an event in which the replacement implant limits the load transferred to bone and the ineffective stress in the vertebrae causes bony growth to cease. In the present study, a 3D finite element L4-L5 model was developed and subjected to a 1200 N compression preload. Five groups of muscle forces were applied on L4 under flexion-extension, lateral bending and axial rotation. Topology optimisation was employed for reducing the stress shielding effect by removing the ineffective material from the design domain. The optimised design was designed with polyaryletheretherketone (PEEK) titanium and cortical materials to encounter the shielding response. The stress responses show that the new design increased the stress magnitude by at least 17.10, 18.11 and 18.43% in 4 Nm of flexion-extension, lateral bending and axial rotation, respectively. In conclusion, the material factor did not significantly alter the stress magnitude, but volume was the key factor in reducing the stress shielding effect.

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Citations

Sep 15, 2016·Computer Methods in Biomechanics and Biomedical Engineering·Mingzheng ZhangYubo Fan
Feb 1, 2018·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Ling WangXi Jiang
Nov 22, 2018·Clinical Anatomy : Official Journal of the American Association of Clinical Anatomists & the British Association of Clinical Anatomists·Yang LiLijun Wu
Oct 28, 2019·Biomechanics and Modeling in Mechanobiology·Abdulsalam Abdulaziz Al-TamimiPaulo Bartolo
Jul 7, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Jianfeng KangLing Wang
Sep 24, 2021·Computer Methods in Biomechanics and Biomedical Engineering·Vijay Kumar MeenaRavindra Kumar Sinha

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