How does lubricant viscosity affect the wear behaviour of VitE-XLPE articulated against CoCr?

Abstract:

:Using a 50-station pin-on-disc (SuperCTPOD) machine, the influence of lubricant viscosity on the wear of vitamin E blended crosslinked polyethylene was investigated. Five different test lubricants were prepared by mixing different concentrations of carboxymethyl cellulose powder with deionised water. The viscosity range of the lubricants was 0.002-0.155 Pa, a range that represents the viscosities of diseased and healthy synovial fluids. Five groups of pins (10 pins in each group) were articulated against cobalt chromium discs. Wear was measured in terms of weight loss from each pin and disc for every group. Every 500,000 cycles the experiment was stopped to take gravimetric measurements along with roughness measurements of the articulating surfaces. The test discs did not show a significant change in weight after 2.5 million cycles of testing (p > 0.05). For the pins, the group tested with the lowest viscosity (0.002 Pa) produced the highest wear rate, namely 0.931 mg/million cycles, and the wear rates of the other groups were 0.074, 0.027, 0.034 and 0.021 mg/million cycles respectively. The wear rates calculated for the five groups were all lower than the wear rates recorded for ultrahigh molecular weight polyethylene and not significantly different to crosslinked polyethylene. In addition, apart from group 1 pins (tested with the lowest lubricant viscosity (0.002 Pa)), the machining marks on the other pins were still present after 2.5 million cycles of testing, indicating low wear.

authors

Kandemir G,Smith S,Chen J,Joyce TJ

doi

10.1016/j.jmbbm.2020.104067

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

104067

eissn

1751-6161

issn

1878-0180

pii

S1751-6161(20)30616-0

journal_volume

112

pub_type

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