Meng, QE, Liu, F, Fisher, J et al. (1 more author) (2011) Transient elastohydrodynamic lubrication analysis of a novel metal-on-metal hip prosthesis with a non-spherical femoral bearing surface. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 225 (1). 25 - 37. ISSN 0954-4119
Abstract
Effective lubrication performance of metal-on-metal hip implants only requires optimum conformity within the main loaded area, while it is advantageous to increase the clearance in the equatorial region. Such a varying clearance can be achieved by using non-spherical bearing surfaces for either acetabular or femoral components. An elastohydrodynamic lubrication model of a novel metal-on-metal hip prosthesis using a non-spherical femoral bearing surface against a spherical cup was solved under loading and motion conditions specified by ISO standard. A full numerical methodology of considering the geometric variation in the rotating non-spherical head in elastohydrodynamic lubrication solution was presented, which is applicable to all non-spherical head designs. The lubrication performance of a hip prosthesis using a specific non-spherical femoral head, Alpharabola, was analysed and compared with those of spherical bearing surfaces and a non-spherical Alpharabola cup investigated in previous studies. The sensitivity of the lubrication performance to the anteversion angle of the Alpharabola head was also investigated. Results showed that the non-spherical head introduced a large squeeze-film action and also led to a large variation in clearance within the loaded area. With the same equatorial clearance, the lubrication performance of the metal-on-metal hip prosthesis using an Alpharabola head was better than that of the conventional spherical bearings but worse than that of the metal-on-metal hip prosthesis using an Alpharabola cup. The reduction in the lubrication performance caused by the initial anteversion angle of the non-spherical head was small, compared with the improvement resulted from the non-spherical geometry.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2011, SAGE Publications. This is an author produced version of a paper published in the Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | metal-on-metal hip prostheses; elastohydrodynamic lubrication; non-spherical bearing surfaces; Alpharabola surface; initial contact position; joint simulator; wear particles; ion release; in-vitro; arthroplasty; replacements; clearance; tribology; implants; diameter |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Medical and Biological Engineering (iMBE) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Jul 2013 11:30 |
Last Modified: | 29 Mar 2018 17:21 |
Published Version: | http://dx.doi.org/10.1243/09544119JEIM795 |
Status: | Published |
Publisher: | SAGE Publications |
Identification Number: | 10.1243/09544119JEIM795 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:75941 |