In vitro simulation of fretting-corrosion in hip implant modular junctions: The influence of pH
| Autor: | Mathew T. Mathew, Megha Patel, Joshua J. Jacobs, Nadim J. Hallab, Markus A. Wimmer, Dmitry Royhman |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Friction Surface Properties Alloy Biomedical Engineering Biophysics Periprosthetic Fretting 02 engineering and technology engineering.material Metal Hip implant 0203 mechanical engineering Materials Testing Alloys Electrochemistry Adhesive wear Composite material Mechanical Phenomena Titanium Drop (liquid) Particle displacement Hydrogen-Ion Concentration Models Theoretical 021001 nanoscience & nanotechnology Prosthesis Failure Corrosion 020303 mechanical engineering & transports visual_art visual_art.visual_art_medium engineering Chromium Alloys Hip Prosthesis 0210 nano-technology |
| Zdroj: | Medical Engineering & Physics. 52:1-9 |
| ISSN: | 1350-4533 |
| DOI: | 10.1016/j.medengphy.2017.10.016 |
| Popis: | Background The fretting-corrosion behavior of mixed metal contacts is affected by various mechanical and electrochemical parameters. Crevice conditions at the junction and patient-specific pathologies can affect the pH of the prosthetic environment. The main objective of this study is to understand the effect of pH variation at the stem/head junction of the hip implant under fretting corrosion exposure. We hypothesized that pH will have a significant influence on the fretting-corrosion behavior hip implant modular junctions. Materials and methods A custom-made setup was used to evaluate the fretting corrosion behavior of hip implant modular junctions. A Newborn calf serum solution (30 g/L protein content) was used to simulate the synovial fluid environment. A sinusoidal fretting motion, with a displacement amplitude of +50 µm, was applied to the Ti alloy rod. The effects of pathology driven, periprosthetic pH variation were simulated at four different pH levels (3.0, 4.5, 6.0 and 7.6). Electrochemical and mechanical properties were evaluated before, during, and after the applied fretting motion. Results The impedance of the system was increased in response to the fretting motion. The hysteresis tangential load/displacement behavior was not affected by pH level. The worn surfaces of CoCrMo pins exhibited the presence of tribolayer or organic deposits, in the pH 4.5 group, which may explain the lower drop in potential and mass loss observed in that group. Mechanically dominated wear mechanisms, namely, adhesive wear was shown in the pH 7.6 group, which may account for a higher potential drop and metal content loss. Conclusions This study suggests that the fretting-corrosion mechanisms in hip implant are affected by the pH levels of the surrounding environment and patient-specific factors. |
| Databáze: | OpenAIRE |
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