Heterogeneous material mapping methods for patient-specific finite element models of pelvic trabecular bone: A convergence study

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dc.citation.firstpage1
dc.citation.journalTitleMedical Engineering & Physics
dc.citation.lastpage12
dc.citation.volumeNumber96
dc.contributor.authorBabazadeh Naseri, Ata
dc.contributor.authorDunbar, Nicholas J.
dc.contributor.authorBaines, Andrew J.
dc.contributor.authorAkin, John E.
dc.contributor.authorHiggs, C. Fred III
dc.contributor.authorFregly, Benjamin J.
dc.date.accessioned2021-09-10T14:09:51Z
dc.date.available2021-09-10T14:09:51Z
dc.date.issued2021
dc.description.abstractPatient-specific finite element (FE) models of bone require the assignment of heterogeneous material properties extracted from the subject's computed tomography (CT) images. Though node-based (NB) and element-based (EB) material mapping methods (MMMs) have been proposed, the sensitivity and convergence of FE models to MMM for varying mesh sizes are not well understood. In this work, CT-derived and synthetic bone material data were used to evaluate the effect of MMM on results from FE analyses. Pelvic trabecular bone data was extracted from CT images of six subjects, while synthetic data were created to resemble trabecular bone properties. The numerical convergence of FE bone models using different MMMs were evaluated for strain energy, von-Mises stress, and strain. NB and EB MMMs both demonstrated good convergence regarding total strain energy, with the EB method having a slight edge over the NB. However, at the local level (e.g., maximum stress and strain), FE results were sensitive to the field type, MMM, and the FE mesh size. The EB method exhibited superior performance in finer meshes relative to the voxel size. The NB method converged better than did the EB method for coarser meshes. These findings may lead to higher-fidelity patient-specific FE bone models.
dc.identifier.citationBabazadeh Naseri, Ata, Dunbar, Nicholas J., Baines, Andrew J., et al.. "Heterogeneous material mapping methods for patient-specific finite element models of pelvic trabecular bone: A convergence study." <i>Medical Engineering & Physics,</i> 96, (2021) Elsevier: 1-12. https://doi.org/10.1016/j.medengphy.2021.07.012.
dc.identifier.doihttps://doi.org/10.1016/j.medengphy.2021.07.012
dc.identifier.urihttps://hdl.handle.net/1911/111352
dc.language.isoeng
dc.publisherElsevier
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier.
dc.subject.keywordPelvic trabecular bone
dc.subject.keywordHeterogenous material
dc.subject.keywordCT-derived elastic properties
dc.subject.keywordDensity-stiffness
dc.subject.keywordPhantomless calibration
dc.subject.keywordPatient-specific finite element model
dc.subject.keywordMaterial mapping method
dc.titleHeterogeneous material mapping methods for patient-specific finite element models of pelvic trabecular bone: A convergence study
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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