Sub-surface characterisation of tribological contact zone of metal hip prostheses

Zeng, Peng; Sharp, J. H.; Rana, A.S.; Thompson, R; Rainforth, W. M.; Cook, Richard

doi:10.1088/1742-6596/644/1/012029

Cited by 2 publications

(1 citation statement)

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“…Our own contribution to this discussion was that maybe one out of many aspects could be the influence of so-called "tribomaterial" [7,8]. Many papers of protein lubricated metal-on-metal sliding contacts in vivo and in vitro report on tribochemically generated layers [9][10][11][12]. These socalled tribofilms, aka tribomaterial, consist of carbonaceous material from the periprosthetic joint fluid mixed with nanometer size metal and oxide wear particles, while other constituents are still under investigation [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

On the Growth Rate of Tribomaterial in Bovine Serum Lubricated Sliding Contacts

et al. 2016

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Considering total hip arthroplasty, so-called tribolayers (aka tribomaterial), consist of carbonaceous material from the periprosthetic joint fluid or bovine serum mixed with nanometer size metal and oxide wear particles. Currently, its growth sequence and rate are unknown. Thus, smooth surfaces of low-Carbon (LC-) vs. high-Carbon (HC-)CoCrMo (Cobalt-Chromium-Molybdenum) alloys have been worn in a conforming contact under bovine serum lubrication by means of a pin-on-ball wear tester. These tests were interrupted at certain numbers of cycles in order to weigh the specimens, characterize the topography, and investigate the wear appearances. In addition, after cleaning in ethanol and anionic detergent, before-and-after comparison rendered the weight of the tribomaterial. This revealed that, during run-in, the specimens gained weight by generating tribomaterial. Afterwards the loss of material surpassed the generation of new tribomaterial and a steady weight-loss was measured. Topography measurements were used as input data for contact mechanics calculations. Apparently the incipient, locally high contact stresses accelerated tribochemical reactions. After run-in, the contact situation changes and leads to a much smaller generation rate. This paper provides information about the growth sequence and rate of such tribomaterial formation. It further highlights the significance of highly localized contact stress as an important factor for tribomaterial generation.

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