Comparative static analysis of knee endoprosthesis implants for shor and long stem lengths by the means of FEB

Pawlik, Mateusz and Baliga, Ravishanker B and Shenoy, Satish B and Pai, Raghuvir B (2014) Comparative static analysis of knee endoprosthesis implants for shor and long stem lengths by the means of FEB. In: Proceedings of International conference on Computational Methods in Engineering and Health Sciences, December 17-19 2014, Manipal.

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Abstract

The main aim of this work was evaluation of the displacements and stresses in components of knee endoprosthesis using Finite Element Method. The semi-constrained knee endoprosthesis with two stem length variants instrumented into femur and tibia bones was chosen for the analysis. The first step was preparation of two full knee endoprostheses geometrical models which were developed on a basis of a real model. Using reverse engineering methods containing 3D scanning and post-processing, model was obtained and then modified due to analysis assumptions. To carry out an analysis it was necessary to develop a femur and tibia bone models, which were obtained from MRI scans. Next a grid for finite-element method calculations was generated for the geometrical models. Subsequently it was necessary to specify and set the edge conditions to reflect appropriately the phenomena taking place in the real system. The system was loaded with axial force in range 500-2000N. Calculations were realized for endoprosthesis components made of Co-Cr-Ni-Mo alloy for femoral part, Ti-35Nb-7Zr-5Ta alloy for femoral implant stem and tibial part and UHMWPE for plastic sliding bearing. On a basis of obtained result, the highest values of reduced stress in both types of endoprostheses were observed in the femur bone and stem of femoral implant. Stress in bone didn’t exceed its compression strength. The biomechanical analysis may form the basis for improving the geometry of analyzed endoprostheses and optimizing a selection of the mechanical properties of the material used to manufacture them.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: FEM, Knee endoprosthesis, Knee implant, TKA.
Subjects: Engineering > MIT Manipal > Aeronautical and Automobile
Engineering > MIT Manipal > Biomedical
Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 20 Jul 2015 11:34
Last Modified: 20 Jul 2015 11:34
URI: http://eprints.manipal.edu/id/eprint/143452

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