Al-Hajjar, M orcid.org/0000-0001-5008-6138, Fisher, J orcid.org/0000-0003-3833-3700, Williams, S orcid.org/0000-0002-6963-965X et al. (2 more authors) (2013) Effect of femoral head size on the wear of metal on metal bearings in total hip replacements under adverse edge‐loading conditions. Journal of Biomedical Materials Research. Part B: Applied Biomaterials, 101B (2). pp. 213-222. ISSN 1552-4973
Abstract
Metal-on-metal (MoM) bearings have shown low-wear rates under standard hip simulator conditions; however, retrieval studies have shown large variations in wear rates and mechanisms. High-wear in vivo has caused catastrophic complications and has been associated with steep cup-inclination angle (rotational malpositioning). However, increasing the cup-inclination angle in vitro has not replicated the increases in wear to the same extent as those observed in retrievals. Clinically relevant wear rates, patterns, and particles were observed in vitro for ceramic-on-ceramic bearings when microseparation (translational malpositioning) conditions were introduced into the gait cycle. In the present study, 28 and 36-mm MoM bearings were investigated under adverse conditions. Increasing the cup angle from 45° to 65° resulted in a significant increase in the wear rate of the 28 mm bearings. However, for the 36 mm bearings, head-rim contact did not occur under the steep cup-angle condition, and the wear rate did not increase. The introduction of microseparation to the gait cycle significantly increased the wear rate of the MoM bearings. Cup angle and head size did not influence the wear rate under microseparation conditions. This study indicated that high-in vivo wear rates were associated with edge loading due to rotational malpositioning such as high-cup-inclination angle and translational malpositioning that could occur due to several surgical factors. Translational malpositioning had a more dominant effect on the wear rate. Preclinical simulation testing should be undertaken with translational and rotational malpositioning conditions as well as standard walking cycle conditions defined by the ISO standard.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013, Wiley. This is an author produced version of a paper published in Journal of Biomedical Materials Research. Part B: Applied Biomaterials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | edge loading; metal-on-metal; hip replacement; microseparation; inclination angle |
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) The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biomedical Sciences (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Jun 2014 14:34 |
Last Modified: | 20 Jun 2021 08:37 |
Published Version: | http://dx.doi.org/10.1002/jbm.b.32824 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/jbm.b.32824 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:79101 |