Finite element study on the influence of pore size and structure on stress shielding effect of additive manufactured spinal cage

Vijay Kumar Meena, Parveen Kalra and Ravindra Kumar Sinha

Computer Methods in Biomechanics and Biomedical Engineering, 2022, vol. 25, issue 5, 566-577

Abstract: The stress shielding effect occurs when the orthopedic implant reduces the load delivered to the bone, causing inefficient stress transfer to the host bone. The usage of porous additive manufactured (AM) cages reduces the stress shielding effect and promotes bone ingrowth also. The purpose of this work is to study the stress and deformation on porous hybrid spinal cages under different loading conditions using Finite Element Analysis (FEA). The spinal cages consisting of three porous structures with pore sizes ranging from 0.4 to 0.6 mm were investigated for stress shielding and fatigue strength. The results showed a significant reduction in stress shielding for the studied designs and conclude that the pore size has a greater significant effect on stress shielding than the porous structure in spinal cages.

Date: 2022
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DOI: 10.1080/10255842.2021.1970142

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