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Determination of the temperature rise within UHMWPE tibial components during tribological loading

Title data

Galetz, Mathias ; Uth, Tobias ; Wimmer, Markus A. ; Adam, Peter ; Glatzel, Uwe:
Determination of the temperature rise within UHMWPE tibial components during tribological loading.
In: Acta Biomaterialia. Vol. 6 (February 2010) Issue 2 . - pp. 552-562.
ISSN 1878-7568
DOI: https://doi.org/10.1016/j.actbio.2009.06.023

Abstract in another language

The wear of ultrahigh molecular weight polyethylene (UHMWPE) is considered as one of the major reasons for revision of artificial joints. While in vivo measurements have shown a significant temperature increase in knee implants, the amount of heat dissipated within the UHMWPE tibial component and its influence on the friction behavior when paired with a cobalt-chromium (CoCrMo) femoral component is unknown. Our goal was to address these questions by measuring the temperature rise over a wide range of tribological loading conditions that mimic certain spots on artificial knee joints. The temperature rise as a function of lubricant, sliding velocity, coefficient of friction and maximum load was determined and analyzed. Additionally, the heat gradient during constant loading was investigated that allows the calculation of heat flow. The test setup consists of a wheel-on-flat laboratory testing device. Tests were performed in ambient air and different lubricants. During the tests, the temperature rise in the polyethylene was recorded with embedded thermocouples. The temperature rise was high and shown to be directly linked to load, coefficient of friction and relative velocity. Because it is generally assumed that the applied energy is an indicator for the development of wear in particles, some considerations for the design of knee joints are proposed based on our observations. The amount of heat dissipated in the polyethylene under cyclic loading was measured and is discussed in comparison with the theoretical model of temperature in friction pairs.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Polyethylenes; Temperature; Tibia/chemistry
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science > Chair Metals and Alloys > Chair Metals and Alloys - Univ.-Prof. Dr.-Ing. Uwe Glatzel
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Metals and Alloys
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 23 Sep 2015 06:29
Last Modified: 02 Mar 2016 14:53
URI: https://eref.uni-bayreuth.de/id/eprint/5254