Journal ArticleDOI
Three-dimensional structural optimization of a cementless hip stem using a bi-directional evolutionary method.
Reza Rahchamani,Reza Soheilifard +1 more
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This study presents a numerical methodology for structural optimization of stem geometry using a bi-directional evolutionary structural optimization method and 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.Abstract:
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.read more
Citations
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The advances of topology optimization techniques in orthopedic implants: A review.
TL;DR: Wang et al. as mentioned in this paper focused on the current stage of TO technique with respect to the global layout and hierarchical structure in orthopedic implants and discussed the characteristics of implants, methods of TO, validation methods of newly designed implants, and limitations of current research have been summarized.
Journal ArticleDOI
Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding
TL;DR: In this article, the authors developed topology optimisation techniques for compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship, which can lead to strain shielding, bone loss and complex revision surgery.
Journal ArticleDOI
The effect of functionally graded materials on bone remodeling around osseointegrated trans-femoral prostheses.
TL;DR: In this paper, the authors proposed fixations made of functionally graded materials (FGMs) for periprosthetic bone adaptation and found that using a radial FGM with low-stiffness material in the outer layer and less metal composition significantly improved bone remodeling behavior.
Journal ArticleDOI
Biofunctional micro/nanostructured “volcano-like” layer-coated 3D porous Ti-10Ta-2Nb-2Zr scaffolds improve osteogenesis and osseointegration for dental implants in vitro and in vivo
TL;DR: In this paper, macroporous structures on TTNZ alloy scaffolds manufactured by selective laser melting (SLM) were used to reduce their modulus of elasticity and strengthen bone interlocking.
Journal ArticleDOI
The effect of the degradation pattern of biodegradable bone plates on the healing process using a biphasic mechano-regulation theory
Sara Kowsar,Reza Soheilifard +1 more
TL;DR: Results of this work showed that the application of plates with a high enough initial elastic modulus and degradation period can prevent the healing process from decelerating.
References
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Journal ArticleDOI
"Modes of failure" of cemented stem-type femoral components: a radiographic analysis of loosening.
TL;DR: In view of the increasing incidence of stem-type femoral component loosening, a detailed retrospective radiographic zonal analysis of 389 total hip replacements indicated a 19.5% incidence of radiological evidences of mechanical looseness, i.e., fractured acrylic cement and/or a radiolucent gap at the stem-cement or cement-bone interfaces.
Journal ArticleDOI
A simple evolutionary procedure for structural optimization
Yi Min Xie,Grant P. Steven +1 more
TL;DR: In this paper, a simple evolutionary procedure is proposed for shape and layout optimization of structures, where low stressed material is progressively eliminated from the structure during the evolution process, and various examples are presented to illustrate the optimum structural shapes and layouts achieved by this procedure.
Journal ArticleDOI
The relationship between stress shielding and bone resorption around total hip stems and the effects of flexible materials
TL;DR: The methods presented in this paper can be used to establish optimal stem-design characteristics or check the adequacy of designs in preclinical testing procedures.
Journal ArticleDOI
Trabecular bone modulus–density relationships depend on anatomic site
TL;DR: There is no universal modulus-density relationship for on-axis loading for trabecular bone, and tissue moduli computed using methods that account for inter-site architectural variations did not differ across site, suggesting that the site-specificity in apparent moduli-density relationships may be attributed to differences in architecture.
Journal ArticleDOI
The behavior of adaptive bone-remodeling simulation models
TL;DR: It is shown that the discontinuous end configuration is dictated by the nature of the differential equations describing the remodeling process, and hypothesized that trabecular bone is a chaotically ordered structure which can be considered as a fractal with characteristics of optimal mechanical resistance and minimal mass.
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