Reduced stress shielding with limited micromotions using a carbon-fiber composite biomimetic hip stem: a finite element model

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DOIResolve DOI: http://doi.org/10.1177/0954411911412465
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TypeArticle
Journal titleProceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Volume225
Pages# of pages: 14
SubjectHip prosthesis; biomimetic material; composite material; finite element analysis
AbstractTotal hip arthroplasty (THA) enjoys excellent rates of success in older patients, but younger patients are still at risk of aseptic loosening and bone resorption from stress shielding. One solution to the stress shielding problem is to use a hip stem with mechanical properties matching those of cortical bone. The objective of the present study was to investigate numerically the biomechanical performance of such a biomimetic hip stem based on a hydroxyapatite (HA)-coated carbon fibre composite. A finite element model (FEM) of the biomimetic stem was constructed. Contact elements were studied to model the bone–implant interface in a non-osseointegrated and osseointegrated state in the best way. Three static load cases representing slow walking, stair climbing, and gait in a healthy individual were considered. Stress shielding and bone–implant interface micromotions were evaluated and compared with the results of a similar FEM based on titanium alloy (Ti–6Al–4V). The composite stems allowed for reduced stress shielding when compared with a traditional Ti–6Al–4V stem. Micromotions were slightly higher with the composite stem, but remained below 40 µm on most of the HAcoated surface. It is concluded that a biomimetic composite stem might offer a better compromise between stress shielding and micromotions than the Ti–6Al–4V stem with the same external geometry.
Publication date
LanguageEnglish
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number54264
NPARC number18370420
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Record identifier3a26794f-f8e9-47e2-8d8c-091414aed7ce
Record created2011-08-03
Record modified2017-03-23
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