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Series on BIOMECHANICS   ISSN 1313-2458
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Biomedical Analysis of Lateral Lumbar Interbody Fusion (LLIF) Cage for Lumbar Vertebrae
A. A. Zulkefli, M. Hazli Mazlanorcid, H. Takano, N. S. Md Salleh, M .H. Jalil
Abstract: Objective: To develop the interbody cages implanted between the lumbar vertebrae by evaluating the strength of the bone model and the spinal cage. Materials and methods: In this study, finite element analysis (FEA) was applied using Mechanical Finder software (MF) to develop a 3D spine model lumbar vertebrae of the fourth and fifth lumbar vertebrae (L4 - L5) with various interbody cage designs, including honeycomb and rectilinear patterns with 50%, 70%, and 100% infill densities. The cage was made of polyether ether ketone (PEEK) and designed using Solidworks software. The interbody cage was inserted between L4-L5, identified from CT scans utilizing MF. The model was analyzed in MF to assess the strength of the interbody cage, with the results compared to mechanical properties values obtained by applying compression load to simulate spinal movements. Results: The results showed the best interbody cage design was the honeycomb pattern with 70% infill density because the honeycomb structure produced the lowest equivalent and maximum principal stress. Discussion: The findings indicate that when the yield and ultimate tensile strength of the material are higher than the equivalent and maximum principal stress, the risk of cage failure is lower. This is due to it having demonstrated the highest structural capability in comparison to the other cage designs. Consequently, it is imperative to consider that PEEK-based cages with higher infill density exhibit relatively lower stress production than those with lesser infill density. Conclusion: Choosing a mechanically compatible interbody cage design is crucial for achieving biomechanical success in spine surgery.

Series on Biomechanics, Vol.38, No.1 (2024), 45-56
DOI: 10.7546/SB.05.01.2024

Keywords: Degenerative Disc Disease; Finite Element Analysis; honeycomb; Lateral Lumbar Interbody Fusion; PEEK
References: (click to open/close)
DOI: 10.7546/SB.05.01.2024
Date published: 2024-04-23
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