Finite Element Analysis of the Influence of Revision Knee Implant Stem Geometry on the Stress State of the Tibial Bone
DOI:
https://doi.org/10.32515/2664-262X.2026.14(45).137-145Keywords:
finite element analysis, biomechanics, implants, endoprostheses, orthopedics, stress–strain state, structural optimizationAbstract
The aim of this study is to evaluate the effect of revision knee implant stem geometry on the stress–strain state of cancellous bone tissue and to develop a predictive regression model for engineering selection of stem parameters.
A three-dimensional finite element model of the “tibia – revision knee implant” system was developed to investigate the stress–strain state of cancellous bone tissue, taking into account the geometric parameters of the implant stem. Numerical simulations were performed in the ANSYS Workbench environment using a linear elastic isotropic material model.
The study was carried out using a full factorial design for two geometric factors: stem diameter (10– 14 mm) and stem length (72–112 mm). The maximum von Mises equivalent stress on the outer surface of the cancellous bone tissue was selected as the response function.
Based on the results of the numerical experiment, a second-order polynomial regression model was developed to describe the influence of the stem geometric parameters on the stress level in bone tissue, including linear, quadratic and interaction effects of the factors. A high approximation accuracy of the finite element results was demonstrated (R² = 0.9987, maximum relative error does not exceed 0.019%).
The proposed approach makes it possible to significantly reduce computational cost when evaluating the stress–strain state of the bone–implant system and can be used for preliminary optimization of revision knee implant stem geometry and for developing recommendations for individualized selection of implant parameters in clinical practice.
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Copyright (c) 2026 Olha Musiienko, Oleksii Sulyma, Oleksii Morhun, Roman Cheremshuk
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