Performance assessment of femoral knee components made from cobalt-chromium alloy and oxidized zirconium
| Autor: | Thomas R. Turgeon, Alex Vecherya, Eric Bohm, Sean O'Brien, Leah E Guenther, Jan-M Brandt |
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| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_specialty Compressive Strength Databases Factual Scanning electron microscope Alloy chemistry.chemical_element engineering.material Prosthesis Design Risk Assessment chemistry.chemical_compound Materials Testing Surface roughness Medicine Humans Orthopedics and Sports Medicine Femur Arthroplasty Replacement Knee Aged Retrospective Studies Cobalt chromium alloy Zirconium business.industry Abrasive Recovery of Function Polyethylene Middle Aged Surgery Prosthesis Failure Treatment Outcome chemistry engineering Female Implant Chromium Alloys business Knee Prosthesis Biomedical engineering Follow-Up Studies |
| Zdroj: | The Knee. 20(6) |
| ISSN: | 1873-5800 |
| Popis: | Background The surface characteristics of the femoral component affect polyethylene wear in modular total knee replacements. In the present retrieval study, the surface characteristics of cobalt–chromium (CoCr) alloy and oxidized zirconium (OxZr) femoral components were assessed and compared. Methods Twenty-six retrieved CoCr alloy femoral components were matched with twenty-six retrieved OxZr femoral components for implantation period, body-mass index, patient gender, implant type, and polyethylene insert thickness. The surface damage on the retrieved femoral components was evaluated using a semi-quantitative assessment method, scanning electron microscopy, and contact profilometry. Results The retrieved CoCr alloy femoral components showed less posterior surface gouging than OxZr femoral components; however, at a higher magnification, the grooving damage features on the retrieved CoCr alloy femoral components confirmed an abrasive wear mechanism. The surface roughness values Rp, Rpm, and Rpk for the retrieved CoCr alloy femoral components were found to be significantly higher than those of the retrieved OxZr femoral components (p ≤ 0.031). The surface roughness values were higher on the medial condyles than on the lateral condyles of the retrieved CoCr alloy femoral components; such a difference was not observed on the retrieved OxZr femoral components. Conclusions The surface roughness of CoCr alloy femoral components increased while the surface roughness of the OxZr femoral components remained unchanged after in vivo service. Therefore, the OxZr femoral components' resistance to abrasive wear may enable lower polyethylene wear and ensure long-term durability in vivo. Level of Evidence Level IV |
| Databáze: | OpenAIRE |
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