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Fracture characterization in cancellous bone specimens via surface difference evaluation of 3D registered pre- and post-compression micro-CT scans

Article dans une revue avec comité de lecture
Author
PROT, Marianne
DUBOIS, Guillaume
CLOETE, Trevor John
303907 University of Cape Town
SALETTI, Dominique
ccLAPORTE, Sébastien
1001017 Institut de Biomécanique Humaine Georges Charpak [IBHGC]

URI
http://hdl.handle.net/10985/18658
DOI
10.1080/10255842.2015.1069608
Date
2015
Journal
Computer Methods in Biomechanics and Biomedical Engineering

Abstract

In recent years, increasingly stringent passenger vehicle safety requirements have led to a renewed interest in the fracture properties of bone. It has been shown that can- cellous bone architecture is strongly linked to its overall behavior (Follet et al. 2011; Prot et al. 2015). Micro- fracture mechanisms have been resolved by time- consuming direct microscopy (Prot et al. 2012) or by the use of calcein (Lambers et al. 2014; Hernandez et al. 2014). Furthermore, the application of CT scanners, along with the development of registration algorithms, has allowed separated portions of fractured specimen to be registered to the pre-compression scan so as to quantify the differ- ence between 3D shapes as a mean to characterize the fracture behavior (Tassani & Matsopoulos 2014). How- ever, this method is operator-dependent in the case of multiple fracture zone identification and requires suffi- cient deformation of the specimen to obtain distinct reg- istration sets. In addition, built-in micro-compression testers, developed by CT scanner manufacturers, are limited to loading at low levels of strain rate, which does not allow measurement over a range that is representative of daily life. The goal of this study was to identify distinct fracture patterns based on micro-CT scans of cancellous bone specimens, loaded over a large range of strain rates, without the need for specimens that have broken into separate pieces.

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