Micro Finite Element models of the vertebral body: Validation of local displacement predictions
Publication Date
July 11, 2017
Authors
Maria Cristiana Costa, Gianluca Tozzi, Luca Cristofolini, Valentina Danesi, et al
Volume
12
Issue
7
Pages
e0180151
DOI
https://dx.plos.org/10.1371/journal.pone.0180151
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0180151
Scopus
85023160732
Mendeley
http://www.mendeley.com/research/micro-finite-element-models-vertebral-body-validation-local-displacement-predictions
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Mendeley | Further Information

{"title"=>"Micro finite element models of the vertebral body: Validation of local displacement predictions", "type"=>"journal", "authors"=>[{"first_name"=>"Maria Cristiana", "last_name"=>"Costa", "scopus_author_id"=>"57194836411"}, {"first_name"=>"Gianluca", "last_name"=>"Tozzi", "scopus_author_id"=>"35756997900"}, {"first_name"=>"Luca", "last_name"=>"Cristofolini", "scopus_author_id"=>"7006306058"}, {"first_name"=>"Valentina", "last_name"=>"Danesi", "scopus_author_id"=>"36998557900"}, {"first_name"=>"Marco", "last_name"=>"Viceconti", "scopus_author_id"=>"7007048687"}, {"first_name"=>"Enrico", "last_name"=>"Dall'Ara", "scopus_author_id"=>"17341999400"}], "year"=>2017, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "doi"=>"10.1371/journal.pone.0180151", "sgr"=>"85023160732", "scopus"=>"2-s2.0-85023160732", "isbn"=>"1111111111", "pmid"=>"28700618", "pui"=>"617260924"}, "id"=>"399bc501-b256-3e31-8185-1ff1b017d7fc", "abstract"=>"The estimation of local and structural mechanical properties of bones with micro Finite Element (microFE) models based on Micro Computed Tomography images depends on the quality bone geometry is captured, reconstructed and modelled. The aim of this study was to validate microFE models predictions of local displacements for vertebral bodies and to evaluate the effect of the elastic tissue modulus on model’s predictions of axial forces. Four porcine thoracic vertebrae were axially compressed in situ, in a step-wise fashion and scanned at approximately 39μm resolution in preloaded and loaded conditions. A global digital volume correlation (DVC) approach was used to compute the full-field displacements. Homogeneous, isotropic and linear elastic microFE models were generated with boundary conditions assigned from the interpolated displacement field measured from the DVC. Measured and predicted local displacements were compared for the cortical and trabecular compartments in the middle of the specimens. Models were run with two different tissue moduli defined from microindentation data (12.0GPa) and a back-calculation procedure (4.6GPa). The predicted sum of axial reaction forces was compared to the experimental values for each specimen. MicroFE models predicted more than 87% of the variation in the displacement measurements (R2 = 0.87–0.99). However, model predictions of axial forces were largely overestimated (80–369%) for a tissue modulus of 12.0GPa, whereas differences in the range 10–80% were found for a back-calculated tissue modulus. The specimen with the lowest density showed a large number of elements strained beyond yield and the highest predictive errors. This study shows that the simplest microFE models can accurately predict quantitatively the local displacements and qualitatively the strain distribution within the vertebral body, independently from the considered bone types.", "link"=>"http://www.mendeley.com/research/micro-finite-element-models-vertebral-body-validation-local-displacement-predictions", "reader_count"=>23, "reader_count_by_academic_status"=>{"Unspecified"=>2, "Researcher"=>4, "Student > Ph. D. Student"=>10, "Student > Master"=>4, "Student > Bachelor"=>1, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>2, "Researcher"=>4, "Student > Ph. D. Student"=>10, "Student > Master"=>4, "Student > Bachelor"=>1, "Professor"=>2}, "reader_count_by_subject_area"=>{"Engineering"=>10, "Unspecified"=>8, "Materials Science"=>1, "Mathematics"=>1, "Medicine and Dentistry"=>3}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>10}, "Materials Science"=>{"Materials Science"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>3}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>8}}, "group_count"=>2}

Scopus | Further Information

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