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Durham University

Department of Engineering

Staff Profile

Publication details for Professor Jun Jie Wu

Wang, Q., Wu, J.J., Unsworth, A., Briscoe, A., Jarman-Smith, M., Lowry, C., Simpson, D. & Collins, S. (2012). Biotribological study of large diameter ceramic-on-CFR-PEEK hip joint including fluid uptake, wear and frictional heating. Journal of Materials Science: Materials in Medicine 23(6): 1533-1542.

Author(s) from Durham

Abstract

A novel material combination of a large diameter Biolox® Delta zirconia-toughened-alumina (ZTA) head and a pitch-based carbon fibre reinforced poly ether–ether-ketone (CFR-PEEK) MOTIS® cup has been studied. The acetabular cups were inclined at three angles and tested using Durham Hip Simulators. The different inclination angles used did not have a significant effect on the wear rates (ANOVA, p = 0.646). Averaged over all cups, the wear rates were calculated to be 0.551 ± 0.115 mm3/106 cycles and 0.493 ± 0.107 mm3/106 cycles taking into account two types of soak controls; loaded at room temperature and unloaded at 37 °C respectively. Averaged across all femoral heads, the wear rate was 0.243 ± 0.031 mm3/106 cycles. The temperature change of the lubricant caused by the frictional heat was measured in situ. Friction factors measured using the Durham Friction Simulator were lower for the worn CFR-PEEK cups compared with unworn. This correlated with the decreased surface roughness. Even though relatively high friction was observed in these hemispherical hard-on-soft bearings, the wear rate is encouragingly low.