Three-dimensional structural optimization of a cementless hip stem using a bi-directional evolutionary method

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...

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Bibliographic Details
Published in:Computer methods in biomechanics and biomedical engineering 2020-01, Vol.23 (1), p.1-11
Main Authors: Rahchamani, Reza, Soheilifard, Reza
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Hip
Biomedical materials
Bone Cements - pharmacology
Bone Density - drug effects
Bone mass
Bone remodeling
Bone Remodeling - drug effects
Bone-implant interfaces
Computer simulation
Femur - diagnostic imaging
Femur - drug effects
Finite Element Analysis
Finite element method
Hip
Hip Prosthesis
Humans
Imaging, Three-Dimensional
Joint surgery
Male
Middle Aged
Optimization
Prosthesis Design
Stress
Stress concentration
Stress distribution
Stress shielding
Stress, Mechanical
Structural optimization
Surgical implants
Total hip arthroplasty
Walking
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Summary: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.
ISSN:1025-5842
1476-8259
DOI:10.1080/10255842.2019.1661387