The influences of lubricant and material on polymer/CoCr sliding friction

Yao, Jian; Michel, Laurent; Johnson, Todd; Blanchard, Cheryl R.; Crowninshield, Roy D.

doi:10.1016/s0043-1648(03)00180-7

Cited by 120 publications

(98 citation statements)

References 3 publications

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“…Eight buffer solutions are prepared as listed in table 1, all of which have been used in published work on protein lubrication in synovial joints [4,22,[26][27][28]. Di-ionised water, with pH  5.6, is used as the simplest buffer, with no adjustments to pH or additional salt.…”

Section: Solutionsmentioning

confidence: 99%

The effect of buffer solution choice on protein adsorption and lubrication

Parkes

Myant

Cann

et al. 2014

Tribology International

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Submission Abstract (max 120 words)In vitro buffers are frequently used to formulate model synovial fluids to investigate the role of individual constituents in synovial joint lubrication. This work examines how buffer choice affects protein film formation in static and rolling conditions. Solution pH dominates both the protein adsorption kinetics and the formation of tribofilms in static and rolling conditions respectively. Under static conditions, equilibrium adsorbed protein films from all buffers tested have similar properties although three distinct modes of adsorption, governed by the pH of the buffer, are observed. Films formed under rolling conditions are also pH dependent, with large irregular deposits formed in solutions with pH 7.4 or lower, The adsorption properties of proteins under static conditions only partially govern the lubrication properties of proteins. AbstractSynovial fluid contains proteins which can participate in surface film formation and the lubrication of artificial joints. In laboratory experiments, model synovial fluids with a range of buffers are frequently used by various investigators. Buffer compositions with different pH, ionic strength and buffer chemistry may affect protein adsorption, and hence film formation. To clarify the role of buffers in protein film formations, the static adsorption of BSA in a selection of buffers is studied using a quartz crystal microbalance. Three distinct modes of adsorption are observed, but on reaching equilibrium, the adsorbed BSA layers have similar viscoelastic properties in all buffer solutions. The static adsorption results are compared with lubricants film formed in model rolling contacts. Films formed under rolling conditions are pH dependent. Thin, uniform films consistent with adsorbed films, and nonuniform films, with large irregular deposits are formed in high and low pH solutions respectively. The results show that the pH of the solution dominates both the adsorption kinetics of proteins under static conditions and the formation of tribofilms in rolling conditions. However, the adsorption properties of proteins under static conditions only partially govern the lubrication property of protein solutions.

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Section: Solutionsmentioning

confidence: 99%

The effect of buffer solution choice on protein adsorption and lubrication

Parkes

Myant

Cann

et al. 2014

Tribology International

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“…As discussed in [7] the lubricant in a TDR is assumed to be interstitial fluid with a viscosity  of 1.24mPas which is approximately 8 times less viscous compared to the synovial fluid of a diarthrosis. In the case of in vitro wear tests of TDRs the viscosity of the test medium containing 20% bovine serum is 1.0mPas [11]. Fortunately this is very close to the viscosity assumed for interstitial fluid for the in vivo case.…”

Section: Lubrication Modelmentioning

confidence: 55%

Investigation into the Lubrication Regime for Lumbar Total Disc Replacement of the Spine

Kraft¹

2013

IOSRJEN

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-The lubrication regime of articulating surfaces plays an important role for the understanding of the tribological conditions and the resulting wear performance of total disc replacement (TDR) of the spine. In the present study the lubrication regime for lumbar TDRs with ball and socket design have been assessed by applying the Hamrock-Dawson elasto-hydrodynamic lubrication theory. The effect of varying articulation radii and different material combinations on the lubrication regime have been investigated considering load and motion cycles for a representative in vivo situation as well as for in vitro wear testing situations. Independent of geometry or bearing material combinations, the formation of a stable lubrication film is very unlikely for lumbar TDR. The study also reveals that in vitro testing conditions must be carefully selected in order to correlate with the lubrication regime for corresponding in vivo situations.

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“…Yao et al [36] published one of the few papers to report friction tests with HSF using a pin-on-disk tribometer. They compared friction measurements for different polymer pin materials rubbing against a CoCrMo disc with an array of lubricants: DI water, varying concentrations of BCS diluted with DI water, bovine SF and periprosthetic (PP) HSF.…”

Section: Synovial Fluid Lubrication and Wear Of Prosthetic Jointsmentioning

confidence: 99%

The development of a small-scale wear test for CoCrMo specimens with human synovial fluid

et al. 2018

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A B S T R A C TA new test was developed to measure friction and wear of hip implant materials under reciprocating sliding conditions. The method requires a very small amount of lubricant (< 3 ml) which allows testing of human synovial fluid. Friction and wear of Cobalt Chromium Molybdenum (CoCrMo) material pairs were measured for a range of model and human synovial fluid samples. The initial development of the test assessed the effect of fluid volume and bovine calf serum (BCS) concentration on friction and wear. In a second series of tests human synovial fluid (HSF) was used. The wear scar size (depth and volume) on the disc was dependent on protein content and reduced significantly for increasing BCS concentration. The results showed that fluid volumes of < 1.5 ml were affected by evaporative loss effectively increasing the protein concentration resulting in anomalously lower wear. At the end of the test thick deposits were observed in and around the wear scars on the disc and ball; these were analysed by Infrared Reflection-Absorption Spectroscopy. The deposits were composed primarily of denatured proteins and similar IR spectra were obtained from the BCS and HSF tests. The analysis confirmed the importance of SF proteins in determining wear of CoCrMo couples.

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The influences of lubricant and material on polymer/CoCr sliding friction

Cited by 120 publications

References 3 publications

The effect of buffer solution choice on protein adsorption and lubrication

The effect of buffer solution choice on protein adsorption and lubrication

Investigation into the Lubrication Regime for Lumbar Total Disc Replacement of the Spine

The development of a small-scale wear test for CoCrMo specimens with human synovial fluid

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