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A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature
Modular hip joint implants were introduced in arthroplasty medical procedures because they facilitate the tailoring of patients’ anatomy, the use of different materials in one single configuration, as well as medical revision. However, in certain cases, such prostheses may undergo deterioration at t...
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/PMC7924358/ https://www.ncbi.nlm.nih.gov/pubmed/33672713 http://dx.doi.org/10.3390/ma14041005 |
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author | Bermúdez-Castañeda, Angela Igual-Muñoz, Anna Mischler, Stefano |
author_facet | Bermúdez-Castañeda, Angela Igual-Muñoz, Anna Mischler, Stefano |
author_sort | Bermúdez-Castañeda, Angela |
collection | PubMed |
description | Modular hip joint implants were introduced in arthroplasty medical procedures because they facilitate the tailoring of patients’ anatomy, the use of different materials in one single configuration, as well as medical revision. However, in certain cases, such prostheses may undergo deterioration at the head–neck junctions with negative clinical consequences. Crevice-corrosion is commonly invoked as one of the degradation mechanisms acting at those junctions despite biomedical alloys such as Ti6Al4V and CoCr being considered generally resistant to this form of corrosion. To verify the occurrence of crevice corrosion in modular hip joint junctions, laboratory crevice-corrosion tests were conducted in this work under hip joint-relevant conditions, i.e., using similar convergent crevice geometries, materials (Ti6Al4V and CoCr alloys vs. ceramic), surface finish, NaCl solution pHs (5.6 and 2.3), and electrochemical conditions. A theoretical model was also developed to describe crevice-corrosion considering relevant geometrical and electrochemical parameters. To verify the model, a FeCr alloy, known to be sensitive to this phenomenon, was subjected to the crevice-corrosion test in sulfuric acid. The experiments and the model predictions clearly showed that, in principle, crevice corrosion of Ti6Al4V or CoCr is not supposed to occur in typical crevices formed at the stem-neck junction of hip implants. |
format | Online Article Text |
id | pubmed-7924358 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79243582021-03-03 A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature Bermúdez-Castañeda, Angela Igual-Muñoz, Anna Mischler, Stefano Materials (Basel) Article Modular hip joint implants were introduced in arthroplasty medical procedures because they facilitate the tailoring of patients’ anatomy, the use of different materials in one single configuration, as well as medical revision. However, in certain cases, such prostheses may undergo deterioration at the head–neck junctions with negative clinical consequences. Crevice-corrosion is commonly invoked as one of the degradation mechanisms acting at those junctions despite biomedical alloys such as Ti6Al4V and CoCr being considered generally resistant to this form of corrosion. To verify the occurrence of crevice corrosion in modular hip joint junctions, laboratory crevice-corrosion tests were conducted in this work under hip joint-relevant conditions, i.e., using similar convergent crevice geometries, materials (Ti6Al4V and CoCr alloys vs. ceramic), surface finish, NaCl solution pHs (5.6 and 2.3), and electrochemical conditions. A theoretical model was also developed to describe crevice-corrosion considering relevant geometrical and electrochemical parameters. To verify the model, a FeCr alloy, known to be sensitive to this phenomenon, was subjected to the crevice-corrosion test in sulfuric acid. The experiments and the model predictions clearly showed that, in principle, crevice corrosion of Ti6Al4V or CoCr is not supposed to occur in typical crevices formed at the stem-neck junction of hip implants. MDPI 2021-02-20 /pmc/articles/PMC7924358/ /pubmed/33672713 http://dx.doi.org/10.3390/ma14041005 Text en © 2021 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Bermúdez-Castañeda, Angela Igual-Muñoz, Anna Mischler, Stefano A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title | A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title_full | A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title_fullStr | A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title_full_unstemmed | A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title_short | A Crevice Corrosion Model for Biomedical Trunnion Geometries and Surfaces Feature |
title_sort | crevice corrosion model for biomedical trunnion geometries and surfaces feature |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7924358/ https://www.ncbi.nlm.nih.gov/pubmed/33672713 http://dx.doi.org/10.3390/ma14041005 |
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