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Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding
Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two h...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658148/ https://www.ncbi.nlm.nih.gov/pubmed/34885337 http://dx.doi.org/10.3390/ma14237184 |
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author | Tan, Nathanael van Arkel, Richard J. |
author_facet | Tan, Nathanael van Arkel, Richard J. |
author_sort | Tan, Nathanael |
collection | PubMed |
description | Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two hip stems were designed and additive manufactured: (1) a stem based on a stochastic porous structure, and (2) a selectively hollowed approach. Finite element analyses and experimental measurements were conducted to measure stem stiffness and predict the reduction in stress shielding. The selectively hollowed implant increased peri-implanted femur surface strains by up to 25 percentage points compared to a solid implant without compromising predicted strength. Despite the stark differences in design, the experimentally measured stiffness results were near identical for the two optimised stems, with 39% and 40% reductions in the equivalent stiffness for the porous and selectively hollowed implants, respectively, compared to the solid implant. The selectively hollowed implant’s internal structure had a striking resemblance to the trabecular bone structures found in the femur, hinting at intrinsic congruency between nature’s design process and topology optimisation. The developed topology optimisation process enables compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship. |
format | Online Article Text |
id | pubmed-8658148 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-86581482021-12-10 Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding Tan, Nathanael van Arkel, Richard J. Materials (Basel) Article Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two hip stems were designed and additive manufactured: (1) a stem based on a stochastic porous structure, and (2) a selectively hollowed approach. Finite element analyses and experimental measurements were conducted to measure stem stiffness and predict the reduction in stress shielding. The selectively hollowed implant increased peri-implanted femur surface strains by up to 25 percentage points compared to a solid implant without compromising predicted strength. Despite the stark differences in design, the experimentally measured stiffness results were near identical for the two optimised stems, with 39% and 40% reductions in the equivalent stiffness for the porous and selectively hollowed implants, respectively, compared to the solid implant. The selectively hollowed implant’s internal structure had a striking resemblance to the trabecular bone structures found in the femur, hinting at intrinsic congruency between nature’s design process and topology optimisation. The developed topology optimisation process enables compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship. MDPI 2021-11-25 /pmc/articles/PMC8658148/ /pubmed/34885337 http://dx.doi.org/10.3390/ma14237184 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Tan, Nathanael van Arkel, Richard J. Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title | Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title_full | Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title_fullStr | Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title_full_unstemmed | Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title_short | Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding |
title_sort | topology optimisation for compliant hip implant design and reduced strain shielding |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658148/ https://www.ncbi.nlm.nih.gov/pubmed/34885337 http://dx.doi.org/10.3390/ma14237184 |
work_keys_str_mv | AT tannathanael topologyoptimisationforcomplianthipimplantdesignandreducedstrainshielding AT vanarkelrichardj topologyoptimisationforcomplianthipimplantdesignandreducedstrainshielding |