About the inevitable compromise between spatial resolution and accuracy of strain measurement for bone tissue: a 3D zero-strain study

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Dall’Ara, E.^1,2; Barber, D.³; Viceconti, M.^1,2

About the inevitable compromise between spatial resolution and accuracy of strain measurement for bone tissue: a 3D zero-strain study

J Biomech. September 22, 2014;47(12):2956-2963

©2014 Elsevier Ltd. All rights reserved.

Affiliations

¹Department of Mechanical Engineering, University of Sheffield, Sheffield, UK

²INSIGNEO Institute for in silico medicine, University of Sheffield, Sheffield, UK

³Department of Cardiovascular Science, University of Sheffield, Sheffield, UK
Abstract and keywords

The accurate measurement of local strain is necessary to study bone mechanics and to validate micro computed tomography (µCT) based finite element (FE) models at the tissue scale. Digital volume correlation (DVC) has been used to provide a volumetric estimation of local strain in trabecular bone sample with a reasonable accuracy. However, nothing has been reported so far for µCT based analysis of cortical bone. The goal of this study was to evaluate accuracy and precision of a deformable registration method for prediction of local zero-strains in bovine cortical and trabecular bone samples. The accuracy and precision were analyzed by comparing scans virtually displaced, repeated scans without any repositioning of the sample in the scanner and repeated scans with repositioning of the samples.

The analysis showed that both precision and accuracy errors decrease with increasing the size of the region analyzed, by following power laws. The main source of error was found to be the intrinsic noise of the images compared to the others investigated. The results, once extrapolated for larger regions of interest that are typically used in the literature, were in most cases better than the ones previously reported. For a nodal spacing equal to 50 voxels (498 µm), the accuracy and precision ranges were 425–692 µε and 202–394 µε, respectively. In conclusion, it was shown that the proposed method can be used to study the local deformation of cortical and trabecular bone loaded beyond yield, if a sufficiently high nodal spacing is used.

Keywords: Bone; Strain; DVC; Registration; MicroCT
Links

DOI: 10.1016/j.jbiomech.2014.07.019

PubMed: 25113806

WoS: 000343392000018
History

Revised: 2014-07-13

Accepted: 2014-07-13

Online: 2014-07-30

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