Phase Stability of Zirconia and Alumina/Zirconia Composite Heads against UHMWPE Liners in a Temperature-Controlled Hip Simulation Study

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This study evaluated the wear performance of cobalt-chromium, zirconia and alumina/zirconia composite heads against moderately crosslinked ultra-high-molecular-weight polyethylene liners under different temperature conditions. A temperature control unit was utilized to allow direct cooling/heating the head components at 4, 20, 37 and 45 °C in addition to the conventional no temperature control method. Results showed that the polyethylene wear was affected by the coolant temperature. The CoCrMo and the alumina/zirconia groups had similar wear rate without temperature control, however, the CoCrMo group generated 50% more wear than the alumina/zirconia group did when the coolant temperatures were above 20 °C. The zirconia group had the lowest wear rate of the three groups in all temperature conditions. The monoclinic phase content of the zirconia heads were about 0.2 M% before the test and 6.0 M% after the test, while the X-ray diffraction remained similar before and after the test in alumina/zirconia composite heads. The current study was able to reproduce the phase transformation of zirconia ceramics as reported in some clinical retrieval reports. A temperature control feature is recommended in a wear study in order to better simulate implant wear performance under the physiological condition in human body.

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Periodical:

Key Engineering Materials (Volumes 284-286)

Main Theme:

Edited by:

Panjian Li, Kai Zhang and Clifford W. Colwell, Jr.

Pages:

991-994

DOI:

10.4028/www.scientific.net/KEM.284-286.991

Citation:

Y. S. Liao et al., "Phase Stability of Zirconia and Alumina/Zirconia Composite Heads against UHMWPE Liners in a Temperature-Controlled Hip Simulation Study ", Key Engineering Materials, Vols. 284-286, pp. 991-994, 2005

Online since:

April 2005

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$35.00

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