On the matter of synovial fluid lubrication: Implications for Metal-on-Metal hip tribology

Myant, Connor; Cann, P. M.

doi:10.1016/j.jmbbm.2013.12.016

Cited by 59 publications

(51 citation statements)

References 52 publications

(85 reference statements)

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“…There is currently a widespread tendency within the literature to confine the tribological mechanisms operating during the gait cycle to a single lubrication regime (Smith, et al, 2001). The two most popular theories are Boundary and Elasto-Hydrodynamic lubrication which differ significantly in film formation mechanisms, wear characteristics and the response to changing contact conditions (Myant and Cann, 2014). The arguments for (or against) these commonly held ideas were found to be overly simplistic; either ignoring the transient kinematic and loading conditions prevalent in artificial articular joints or the complex rheological and chemical nature of synovial fluid.…”

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: 99%

“…One of the key findings is that the lubricant film thickness does not obey EHL rules; i.e. positive speed and negligible load dependency 2014;Stachowiak and Batchelor;. It was concluded that film thickness predictions could not be made using simple Newtonian fluid rheology and steady state contact conditions.…”

Section: Introductionmentioning

confidence: 99%

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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“…Since these components were designed to be less than a full hemisphere, cups placed with an abduction angle of 45°would behave as if they were in a more vertical position, leading to increased edge loading, wear, and circulating metal ion levels. Additionally, early components with narrow clearance on the perimeter can be deformed with impaction causing failure of fluid film lubrication and increased wear [16][17][18].…”

Section: Wear Pseudotumor and Metal Ionsmentioning

confidence: 99%

Metal-on-metal total hip arthroplasty: is there still a role in 2016?

Silverman

Ashley

Sheth

2016

Curr Rev Musculoskelet Med

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The use of metal-on-metal (MoM) bearings in total hip arthroplasty (THA) was popularized due to its enhanced wear profile and the ability to use large femoral heads to reduce post-operative instability. However, enthusiasm for the bearing declined following serious complications encountered at the primary articulation. This review discusses the development of MoM and the subsequent unexpected downstream challenges, most notably elevated serum metal ion levels, aseptic lymphocyte-dominated vasculitis-associated lesions (ALVAL), pseudotumor formation, and subsequent soft tissue and bone destruction. Both patient centered risk factors as well as component design led to high early failure rates resulting in product recalls and an overall decline in the use of MoM. In 2016, there is not a role for large-head MoM bearing in THA. Alternatively, the bearing has shown promise in hip resurfacing procedures for carefully selected patients.

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“…The properties of the fluid, including pH and protein content vary from patient to patient, and between healthy and diseased states [6,7]. As such the classic models for predicting film thickness developed for simple hydrocarbons, with consistent fluid properties cannot be used to estimate the lubricant thickness separating the rubbing joint surfaces [8]. This greatly limits our ability to design new improved, endurable implant systems.…”

Section: Introductionmentioning

confidence: 99%

“…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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On the matter of synovial fluid lubrication: Implications for Metal-on-Metal hip tribology

Cited by 59 publications

References 52 publications

The effect of transient conditions on synovial fluid protein aggregation lubrication

The effect of transient conditions on synovial fluid protein aggregation lubrication

Metal-on-metal total hip arthroplasty: is there still a role in 2016?

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

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