In contact observation of model synovial fluid lubricating mechanisms

Myant, Connor; Cann, P. M.

doi:10.1016/j.triboint.2012.04.029

Cited by 46 publications

(70 citation statements)

References 32 publications

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“…The new protein-gel phase has a much higher viscosity than the bulk solution. Consequently, a significantly thicker film is formed than would be predicted by classical EHL theory, when the bulk rheological properties are employed (Myant and Cann, 2013).…”

Section: Introductionmentioning

confidence: 95%

“…Previous results demonstrated a clear correlation between inlet size and contact film thickness (Myant and Cann, 2013). Much of this earlier work studied simple uni-directional sliding contacts; however articular joints actually experience sliding on multiple axes and reversals in the sliding direction.…”

Section: Introductionmentioning

confidence: 95%

“…Recently the authors have suggested a novel lubrication mechanism describing film formation for complex fluids containing proteins (Fan, et al, 2011;Myant et al, 2012;Myant and Cann, 2013). The model has been developed entirely from experimental studies of model SF lubrication.…”

Section: Introductionmentioning

confidence: 99%

“…Contact entry of this protein phase is complex and dependent on operating conditions (speed, load, geometry) and lubricant properties (molecule size, concentration) (Myant et al, 2012). A direct relationship between contact film thickness and the length, and width, of protein aggregation within the inlet region has been observed (Myant and Cann, 2013). Thus we adopted the 'PAL -Protein Aggregation Lubrication' acronym identifying this process.…”

Section: Introductionmentioning

confidence: 99%

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The effect of transient conditions on synovial fluid protein aggregation lubrication

Myant

Cann

2014

Journal of the Mechanical Behavior of Biomedical Materials

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Little is known about the prevailing lubrication mechanisms in artificial articular joints and the way in which these mechanisms determine implant performance. The authors propose that interfacial film formation is determined by rheological changes local to the contact and is driven by aggregation of synovial fluid proteins within the contact inlet region. A direct relationship between contact film thickness and size of the protein aggregation within the inlet region has been observed.In this paper the latest experimental observations of the protein aggregation mechanism are presented for conditions which more closely mimic joint kinematics and loading. Lubricant films were measured for a series of bovine calf serum solutions for CoCrMo femoral component sliding against a glass disc. An optical interferometric apparatus was employed to study the effects of transient motion on lubricant film formation. Central film thickness was measured as a function of time for a series of transient entrainment conditions; start-up motion, steady-state and non-steadystate uni-directional sliding, and bi-directional sliding. The size of the inlet aggregations was found to be dependent upon the type of transient condition. Thick protective protein films were observed to build up within the main contact region for all uni-directional tests. In contrast the inlet aggregation was not observed for bi-directional tests. Contact film thickness and wear was found to be directly proportional to the presence of the inlet protein phase. The inlet phase and contact films were found to be fragile when disrupted by surface scratches or subjected to reversal of the sliding direction.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of transient conditions on synovial fluid protein aggregation lubrication

Myant

Cann

2014

Journal of the Mechanical Behavior of Biomedical Materials

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“…This greatly limits our ability to design new improved, endurable implant systems. To tackle this shortcoming, the authors have conducted in-situ measurements of lubricating films, to provide insights on lubricating (or protective) film formation mechanisms on rubbing surfaces in fluids with high protein concentrations [5,8,9].…”

Section: Introductionmentioning

confidence: 99%

Synovial Fluid Lubrication: The Effect of Protein Interactions on Adsorbed and Lubricating Films

et al. 2015

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Tribological role of synovial fluid compositions on artificial joints - a systematic review of the last 10 years

et al. 2014

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Biological components of synovial fluid and their concentration play a crucial role in the lubrication mechanism of artificial joints, particularly boundary lubrication. The purpose of this review was to summarise and critically analyse the lubrication mechanism and their tribological outcomes to artificial joints. Thirteen papers published between 01/01/2003 and 28/02/2013 met the inclusion criteria for the review. Four major biological components of synovial fluid (albumin, globulin, hyaluronic acid and lubricin) were found to have an influence on film thickness, friction coefficient and wear rate. The role of these components was reported to be varied, depending on not only their composition and concentration but also surface material properties, wettability, temperature and pressure. The findings suggest that an appropriate synovial fluid composition should be represented in a simulated body fluid in order to evaluate an implant material and subsequently to conduct biotribology tests.

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In contact observation of model synovial fluid lubricating mechanisms

Cited by 46 publications

References 32 publications

The effect of transient conditions on synovial fluid protein aggregation lubrication

The effect of transient conditions on synovial fluid protein aggregation lubrication

Synovial Fluid Lubrication: The Effect of Protein Interactions on Adsorbed and Lubricating Films

Tribological role of synovial fluid compositions on artificial joints - a systematic review of the last 10 years

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