Three-dimensional structural optimization of a cementless hip stem using a bi-directional evolutionary method
Autor: | Reza Soheilifard, Reza Rahchamani |
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Rok vydání: | 2019 |
Předmět: |
Male
Materials science Optimization problem medicine.medical_treatment Arthroplasty Replacement Hip 0206 medical engineering Finite Element Analysis Biomedical Engineering Periprosthetic Bioengineering 02 engineering and technology Prosthesis Design Stress (mechanics) 03 medical and health sciences 0302 clinical medicine Imaging Three-Dimensional Bone Density medicine von Mises yield criterion Humans Femur Reduction (orthopedic surgery) Stress concentration Bone Cements 030229 sport sciences General Medicine Stress shielding Middle Aged 020601 biomedical engineering Finite element method Computer Science Applications Human-Computer Interaction Bone Remodeling Hip Prosthesis Stress Mechanical Biomedical engineering |
Zdroj: | Computer methods in biomechanics and biomedical engineering. 23(1) |
ISSN: | 1476-8259 |
Popis: | A correct choice of stem geometry can increase the lifetime of hip implant in a total hip arthroplasty. This study presents a numerical methodology for structural optimization of stem geometry using a bi-directional evolutionary structural optimization method. The optimization problem was formulated with the objective of minimizing the stresses in the bone-stem interface. Finite element analysis was used to obtain stress distributions by three-dimensional simulation of the implant and the surrounding bone under normal walking conditions. To compare the initial and the optimal stems, the von Mises stress distribution in the bone-implant interface was investigated. Results showed that the optimization procedure leads to a decrease in the stress concentration in the implant and a reduction in stress shielding of the surrounding bone. Furthermore, periprosthetic bone adaptation was analyzed numerically using an adaptive bone remodeling procedure. The remodeling results showed that the bone mass loss could be reduced by 16% in the optimal implant compared to the initial one. |
Databáze: | OpenAIRE |
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