Wear of surface engineered metal-on-metal hip prostheses
| Autor: | John Fisher, Peter Hatto, G Berry, Martin H. Stone, C. Hardaker, Samantha P. Williams, Joanne L. Tipper, Graham Isaac, Eileen Ingham, M Riley, J Bolton, Todd D. Stewart, C Davies, X Q Hu |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Diamond-like carbon Surface Properties Alloy Biomedical Engineering Biophysics chemistry.chemical_element Bioengineering In Vitro Techniques engineering.material law.invention Biomaterials Metal Coated Materials Biocompatible Coating law Materials Testing Humans Particle Size Bearing (mechanical) Spectrophotometry Atomic Metallurgy Cobalt-chrome Prosthesis Failure Microscopy Electron chemistry Metals visual_art Microscopy Electron Scanning engineering visual_art.visual_art_medium Hip Prosthesis Particle size Tin |
| Zdroj: | Journal of Materials Science: Materials in Medicine. 15:225-235 |
| ISSN: | 0957-4530 |
| DOI: | 10.1023/b:jmsm.0000015482.24542.76 |
| Popis: | The wear of existing metal-on-metal (MOM) hip prostheses (1 mm3/million cycles) is much lower than the more widely used polyethylene-on-metal bearings (30-100 mm3/million cycles). However, there remain some potential concerns about the toxicity of metal wear particles and elevated metal ion levels, both locally and systemically in the human body. The aim of this study was to investigate the wear, wear debris and ion release of fully coated surface engineered MOM bearings for hip prostheses. Using a physiological anatomical hip joint simulator, five different bearing systems involving three thick (8-12 microm) coatings, TiN, CrN and CrCN, and one thin (2 microm) coating diamond like carbon (DLC) were evaluated and compared to a clinically used MOM cobalt chrome alloy bearing couple. The overall wear rates of the surface engineered prostheses were at least 18-fold lower than the traditional MOM prostheses after 2 million cycles and 36-fold lower after 5 million cycles. Consequently, the volume of wear debris and the ion levels in the lubricants were substantially lower. These parameters were also much lower than in half coated (femoral heads only) systems that have been reported previously. The extremely low volume of wear debris and concentration of metal ions released by these surface engineered systems, especially with CrN and CrCN coatings, have considerable potential for the clinical application of this technology. |
| Databáze: | OpenAIRE |
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