Impact of modified orthogonal peanut-shaped intervertebral disc implant based on finite element analysis
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Author |
Muhammad Huzaifah Azmi, Muhammad Hazli Mazlan, Mohamad Sazri Fahmi Ramli, Hiromitsu Takano, Abdul Halim Abdullah, Muhammad Hilmi Jalil and Mohammad Azeeb Mazlan
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e-ISSN |
1819-6608 |
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On Pages
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237-244
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Volume No. |
20
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Issue No. |
5
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Issue Date |
April 30, 2025
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DOI |
https://doi.org/10.59018/032536
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Keywords |
finite element analysis, orthogonal peanut-shaped, polyether-ether-ketone, reduced graphene oxide, fracture analysis.
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Abstract
Spinal surgery faces challenges in optimizing implant design for durability and biomechanical compatibility, as traditional intervertebral disc (IVD) implants often struggle with stress distribution and long-term performance. This study addresses these issues by evaluating modified Orthogonal Peanut-Shaped (OPS) IVD implants using Finite Element Analysis (FEA) to enhance design. A 3D inhomogeneous lumbar spine model (L4 and L5) was developed using CT scans, and an OPS auxetic structure was designed using polyether-ether-ketone (PEEK) and reduced graphene oxide (rGO). Extensive FEA assessed mechanical performance, focusing on equivalent stress, maximum principal stress, and fracture analysis under physiological conditions. The findings revealed that the modified OPS auxetic infill pattern significantly improved stress distribution compared to traditional designs. In worst-case scenarios, the orthogonal sinusoidal-shaped lattice (OSSL) pattern reduced average equivalent stress by 0.19% and maximum principal stress by 0.76% compared to real IVD designs. While OPSP showed moderate performance, OSSL excelled in stress management, and OPSL highlighted areas for improvement. These results align with existing literature on auxetic structures and advanced biomaterials, underscoring the importance of implant geometry and porosity in optimizing performance. This research validates the modified OPS design's potential to enhance patient outcomes in spinal surgery by improving biomechanical compatibility.
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