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...

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Bibliographic Details
Published in:Materials 2021-02, Vol.14 (4), p.1005
Main Authors: Bermúdez-Castañeda, Angela, Igual-Muñoz, Anna, Mischler, Stefano
Format: Article
Language:English
Subjects:
Biomedical materials
Corrosion potential
Corrosion resistance
Corrosion tests
Crevice corrosion
Electrodes
Electrolytes
Experiments
Intermetallic compounds
Metals
Orthopaedic implants
Parameter sensitivity
Prostheses
Shafts (machine elements)
Sulfuric acid
Surface finish
Surgical implants
Titanium alloys
Titanium base alloys
Transplants & implants
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14041005