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Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication
The acetabular cups used in total hip arthroplasty are mostly made of dense metal materials with an elastic moduli much higher than that of human bone. This leads to stress shielding after implantation, which may cause aseptic loosening of the implant. Selective laser melting (SLM) technology allows...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457748/ https://www.ncbi.nlm.nih.gov/pubmed/36079522 http://dx.doi.org/10.3390/ma15176142 |
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author | Wang, Congyu Sun, Baoyu Zhang, Yongdi Wang, Congwei Yang, Guang |
author_facet | Wang, Congyu Sun, Baoyu Zhang, Yongdi Wang, Congwei Yang, Guang |
author_sort | Wang, Congyu |
collection | PubMed |
description | The acetabular cups used in total hip arthroplasty are mostly made of dense metal materials with an elastic moduli much higher than that of human bone. This leads to stress shielding after implantation, which may cause aseptic loosening of the implant. Selective laser melting (SLM) technology allows us to produce tiny and complex porous structures and to reduce the elastic moduli of dense metals, thereby avoiding stress shielding. In the present study, rhombic dodecahedron porous structures with cell sizes of 1 mm, 1.5 mm, and 2 mm were designed. The strut diameter was changed to ensure that the porosity and pore size would meet the bone ingrowth requirements. Then, porous Ti6Al4V alloy specimens were printed using SLM, and compressive tests were carried out. The results showed that the compressive strength and elastic modulus values of the specimens with a cell size of 1.5 mm were in the range of 78.16–242.94 MPa and 1.74–4.17 GPa, respectively, which are in line with the mechanical properties of human cortical bone. Finite element analysis of a total hip joint model was carried out to simulate gait, and the surface of the trabecular acetabular cup was divided into 10 regions according to the stress distribution, with the stress interval in the range of 37.44–219.24 MPa. According to the compression test results, the gradient structure of Ti6Al4V alloy with different porosity was designed for trabecular coating. The gradient porous structure meets the mechanical requirements and is closer to the natural structure of human bone than the uniformly distributed porous structure. |
format | Online Article Text |
id | pubmed-9457748 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-94577482022-09-09 Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication Wang, Congyu Sun, Baoyu Zhang, Yongdi Wang, Congwei Yang, Guang Materials (Basel) Article The acetabular cups used in total hip arthroplasty are mostly made of dense metal materials with an elastic moduli much higher than that of human bone. This leads to stress shielding after implantation, which may cause aseptic loosening of the implant. Selective laser melting (SLM) technology allows us to produce tiny and complex porous structures and to reduce the elastic moduli of dense metals, thereby avoiding stress shielding. In the present study, rhombic dodecahedron porous structures with cell sizes of 1 mm, 1.5 mm, and 2 mm were designed. The strut diameter was changed to ensure that the porosity and pore size would meet the bone ingrowth requirements. Then, porous Ti6Al4V alloy specimens were printed using SLM, and compressive tests were carried out. The results showed that the compressive strength and elastic modulus values of the specimens with a cell size of 1.5 mm were in the range of 78.16–242.94 MPa and 1.74–4.17 GPa, respectively, which are in line with the mechanical properties of human cortical bone. Finite element analysis of a total hip joint model was carried out to simulate gait, and the surface of the trabecular acetabular cup was divided into 10 regions according to the stress distribution, with the stress interval in the range of 37.44–219.24 MPa. According to the compression test results, the gradient structure of Ti6Al4V alloy with different porosity was designed for trabecular coating. The gradient porous structure meets the mechanical requirements and is closer to the natural structure of human bone than the uniformly distributed porous structure. MDPI 2022-09-04 /pmc/articles/PMC9457748/ /pubmed/36079522 http://dx.doi.org/10.3390/ma15176142 Text en © 2022 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 Wang, Congyu Sun, Baoyu Zhang, Yongdi Wang, Congwei Yang, Guang Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title | Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title_full | Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title_fullStr | Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title_full_unstemmed | Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title_short | Design of a Novel Trabecular Acetabular Cup and Selective Laser Melting Fabrication |
title_sort | design of a novel trabecular acetabular cup and selective laser melting fabrication |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9457748/ https://www.ncbi.nlm.nih.gov/pubmed/36079522 http://dx.doi.org/10.3390/ma15176142 |
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