Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Wang, Congyu, Sun, Baoyu, Zhang, Yongdi, Wang, Congwei, Yang, Guang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
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
_version_ 1784786132069777408
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
work_keys_str_mv AT wangcongyu designofanoveltrabecularacetabularcupandselectivelasermeltingfabrication
AT sunbaoyu designofanoveltrabecularacetabularcupandselectivelasermeltingfabrication
AT zhangyongdi designofanoveltrabecularacetabularcupandselectivelasermeltingfabrication
AT wangcongwei designofanoveltrabecularacetabularcupandselectivelasermeltingfabrication
AT yangguang designofanoveltrabecularacetabularcupandselectivelasermeltingfabrication