Lam, L. O. and Stoffel, K. and Kop, A. and Swarts, E.. (2008) Catastrophic failure of 4 cobalt-alloy Omnifit hip arthroplasty femoral components. Acta Orthopaedica, Vol. 79, H. 1. pp. 18-21.
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Official URL: http://edoc.unibas.ch/dok/A6004539
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Abstract
BACKGROUND: Femoral component neck fracture is an uncommon type of failure in total hip arthroplasty. We present a report on 4 retrieved cobalt-chrome femoral components that fractured at the neck, where we investigated the mechanisms of failure. METHODS: The 4 retrieved implants were analyzed with regard to their macro- and microstructures and the fracture surfaces were examined using electron microscopy. The medical record of each patient was also examined for any history of complications prior to failure of the implant. RESULTS: These fractures occurred immediately adjacent to the base of the modular head. Skirted modular heads were used in 3 of the 4 failed components. This constructs promotes corrosion. Cyclic fatigue-loading in combination with the material factors of course grain microstructure and extensive carbide precipitation along the grain boundaries were also identified as the cause of implant failure. INTERPRETATION: Our findings suggest that a solution annealing step could be introduced into the manufacturing process to improve the microstructure of the cobalt chrome alloy. We also advise caution in using a skirted modular head in combination with a device of known suboptimum microstructure, for a greater margin of safety.
Faculties and Departments: | 03 Faculty of Medicine > Bereich Operative Fächer (Klinik) > Bewegungsapparat und Integument 03 Faculty of Medicine > Departement Klinische Forschung > Bereich Operative Fächer (Klinik) > Bewegungsapparat und Integument |
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UniBasel Contributors: | Stoffel, Karl |
Item Type: | Article, refereed |
Article Subtype: | Research Article |
Publisher: | Munksgaard |
ISSN: | 1745-3674 |
Note: | Publication type according to Uni Basel Research Database: Journal article |
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Identification Number: |
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Last Modified: | 21 Jun 2013 12:29 |
Deposited On: | 21 Jun 2013 12:23 |
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