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Sensitivity of Lumbar Total Joint Replacement Contact Stresses Under Misalignment Conditions—Finite Element Analysis of a Spine Wear Simulator
Journal article   Open access   Peer reviewed

Sensitivity of Lumbar Total Joint Replacement Contact Stresses Under Misalignment Conditions—Finite Element Analysis of a Spine Wear Simulator

Steven Kurtz, Steven A. Rundell, Hannah Spece and Ronald V. Yarbrough
Bioengineering, v 12(3), 229
14 Feb 2025
DOI: https://doi.org/10.3390/bioengineering12030229
PMID: 40150693
Featured in Collection :   Research Supported by Drexel Libraries' OA Programs
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https://doi.org/10.3390/bioengineering12030229View
Published, Version of Record (VoR)Open Access Discount via Drexel Libraries Read and Publish Program 2025Open Access (License Unspecified),  Open

Abstract

spine arthroplasty validation implant alignment highly crosslinked polyethylene wear contact pressure von Mises stress effective strain
A novel total joint replacement (TJR) that treats lumbar spine degeneration was previously assessed under Mode I and Mode IV conditions. In this study, we relied on these previous wear tests to establish a relationship between finite element model (FEM)-based bearing stresses and in vitro wear penetration maps. Our modeling effort addressed the following question of interest: Under reasonably worst-case misaligned conditions, do the lumbar total joint replacement (L-TJR) polyethylene stresses and strains remain below values associated with Mode IV impingement wear tests? The FEM was first formally verified and validated using the risk-informed credibility assessment framework established by ASME V&V 40 and FDA guidance. Then, based on criteria for unreasonable misuse outlined in the surgical technique guide, a parametric analysis of reasonably worst-case misalignment using the validated L-TJR FEM was performed. Reasonable misalignment was created by altering device positioning from the baseline condition in three scenarios: Axial Plane Convergence (20–40°), Axial Plane A-P Offset (0–4 mm), and Coronal Plane Tilt (±20°). We found that, for the scenarios considered, the contact pressures, von Mises stresses, and effective strains of the L-TJR-bearing surfaces remained consistent with Mode I (clean) conditions. Specifically, the mechanical response values fell below those determined under Mode IV (worst-case) boundary conditions, which provided the upper-bound benchmarks for the study (peak contact pressure 83.3 MPa, peak von Mises stress 32.2 MPa, and peak effective strain 42%). The L-TJR was judged to be insensitive to axial and coronal misalignment under the in vitro boundary conditions imposed by the study.

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4 citations in Web of Science
1 citations in Scopus

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Web of Science research areas
Biotechnology & Applied Microbiology
Engineering, Biomedical
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