The Experts below are selected from a list of 7593 Experts worldwide ranked by ideXlab platform

R W Hewson - One of the best experts on this subject based on the ideXlab platform.

  • a numerical study of non newtonian transient elastohydrodynamic lubrication of metal on metal Hip prostheses
    Tribology International, 2016
    Co-Authors: Leiming Gao, D. Dowson, R W Hewson
    Abstract:

    This paper presents a comprehensive numerical study of transient non-Newtonian elastohydrodynamic lubrication of Metal-on-Metal Hip Prosthesis subjected to two different gait cycles. The shear-thinning property of the synovial fluid was found to have a significant effect on the lubricating film, in terms of both the magnitude and location of the minimum film thickness, and more generally the film thickness distribution. A range of clearances between the acetabular cup and femoral head was investigated and the shear-thinning effect was more pronounced in the Hip replacements with smaller clearances.

J. Fisher - One of the best experts on this subject based on the ideXlab platform.

  • effect of surface texturing on the elastohydrodynamic lubrication analysis of metal on metal Hip implants
    Tribology International, 2010
    Co-Authors: Peiran Yang, Ian Dymond, J. Fisher
    Abstract:

    Abstract With the development of surface processing techniques, applications of bearing components have been introduced with specific surface textures to take advantage of lubrication. An advanced numerical model was established to simulate the mixed EHL problem of a Metal-on-Metal Hip Prosthesis with dimpled surface texturing. The surface texture with simple cylindrical dimples was numerically simulated, under both steady state and walking conditions. The present results showed that surface texturing may have a potentially beneficial effect on the reduction of asperity contact ratio and the improvement of lubrication performance of Metal-on-Metal Hip replacements, particularly under predominant boundary lubrication conditions.

Leiming Gao - One of the best experts on this subject based on the ideXlab platform.

  • a numerical study of non newtonian transient elastohydrodynamic lubrication of metal on metal Hip prostheses
    Tribology International, 2016
    Co-Authors: Leiming Gao, D. Dowson, R W Hewson
    Abstract:

    This paper presents a comprehensive numerical study of transient non-Newtonian elastohydrodynamic lubrication of Metal-on-Metal Hip Prosthesis subjected to two different gait cycles. The shear-thinning property of the synovial fluid was found to have a significant effect on the lubricating film, in terms of both the magnitude and location of the minimum film thickness, and more generally the film thickness distribution. A range of clearances between the acetabular cup and femoral head was investigated and the shear-thinning effect was more pronounced in the Hip replacements with smaller clearances.

Peiran Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of surface texturing on the elastohydrodynamic lubrication analysis of metal on metal Hip implants
    Tribology International, 2010
    Co-Authors: Peiran Yang, Ian Dymond, J. Fisher
    Abstract:

    Abstract With the development of surface processing techniques, applications of bearing components have been introduced with specific surface textures to take advantage of lubrication. An advanced numerical model was established to simulate the mixed EHL problem of a Metal-on-Metal Hip Prosthesis with dimpled surface texturing. The surface texture with simple cylindrical dimples was numerically simulated, under both steady state and walking conditions. The present results showed that surface texturing may have a potentially beneficial effect on the reduction of asperity contact ratio and the improvement of lubrication performance of Metal-on-Metal Hip replacements, particularly under predominant boundary lubrication conditions.

Yves Catonne - One of the best experts on this subject based on the ideXlab platform.

  • outcome and serum ion determination up to 11 years after implantation of a cemented metal on metal Hip Prosthesis
    Acta Orthopaedica, 2009
    Co-Authors: Jeanyves Lazennec, P Boyer, J Poupon, Marcantoine Rousseau, Carine Roy, Philippe Ravaud, Yves Catonne
    Abstract:

    Background and purpose Little is known about the long-term outcome of cemented Metal-on-Metal Hip arthroplasties. We evaluated a consecutive series of Metal-on-Metal polyethylene-backed cemented Hip arthroplasties implanted in patients under 60 years of age.Methods 109 patients (134 joint replacements) were followed prospectively for mean 9 (7–11) years. The evaluation included clinical score, radiographic assessment, and blood sampling for ion level determination.Results At the final review, 12 Hips had been revised, mainly because of aseptic loosening of the socket. Using revision for aseptic loosening as the endpoint, the survival rate at 9 years was 91% for the cup and 99% for the stem. In addition, 35 Hips showed radiolucent lines at the bone-cement interface of the acetabulum and some were associated with osteolysis. The median serum cobalt and chromium levels were relatively constant over time, and were much higher than the detection level throughout the study period. The cobalt level was 1.5 μg/L ...