Journal
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
Volume 226, Issue H11, Pages 877-886Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0954411912456926
Keywords
Metal-on-metal hip resurfacing; contact mechanics; range of motion; implant orientation; cup coverage; edge-loading
Categories
Funding
- DePuy International Ltd
- National Institute for Health Research (NIHR)
- EPSRC
- Leeds Centre of Excellence in Medical Engineering
- Wellcome Trust
- EPSRC [WT088 908/z/09/z]
- EPSRC [EP/J017620/1, EP/G032483/1, EP/F043872/1, EP/I019103/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I019103/1, EP/F043872/1, EP/J017620/1, EP/G032483/1] Funding Source: researchfish
- National Institute for Health Research [NF-SI-0611-10096] Funding Source: researchfish
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Implant malpositioning has been identified as a factor associated with clinical failures of metal-on-metal hip resurfacings (MoMHRs). This study investigated the effect of cup orientation and cup coverage on the contact mechanics (incidence of edge-loading) and range of motion (ROM) of MoMHR. Three generic MoMHRs with differing amounts of cup coverage were considered at various orientations. Contact area and contact pressure at the bearing surface were predicted for each design using finite element (FE) method. The ROM was determined based on the geometry overlap. Edge contact was found at lower angles of inclination (65 degrees) for lower coverage cup designs; however, they also provided the greatest ROM. Conversely, cups with greater coverage did not exhibit edge contact until the cup was more steeply positioned (75 degrees), however ROM was reduced. This study enables both sets of variable to be considered in the design of metal-on-metal bearings in hip.
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