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Monitoring trabecular bone microdamage using a dynamic acousto-elastic testing method

Article dans une revue avec comité de lecture
Auteur
MORESCHI, Hélène
53727 Imaging, Brain & Neuropsychiatry [iBraiN]
CALLE, Samuel
53727 Imaging, Brain & Neuropsychiatry [iBraiN]
MITTON, David
RENAUD, Guillaume
53727 Imaging, Brain & Neuropsychiatry [iBraiN]
DEFONTAINE, Marielle
53727 Imaging, Brain & Neuropsychiatry [iBraiN]
ccGUÉRARD, Sandra
99538 Laboratoire de biomécanique [LBM]

URI
http://hdl.handle.net/10985/7117
DOI
10.1243/09544119JEIM846
Date
2011
Journal
Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

Résumé

Dynamic acousto-elastic testing (DAET) is based on the coupling of a lowfrequency (LF) acoustic wave and high-frequency ultrasound (US) pulses (probing wave). It was developed to measure US viscoelastic and dissipative non-linearity in trabecular bone. It is well known that this complex biphasic medium contains microdamage, even when tissues are healthy. The purpose of the present study was to assess the sensitivity of DAET to monitor microdamage in human calcanei. Three protocols were therefore performed to investigate the regional heterogeneity of the calcaneus, the correlation between DAET measurements and microdamage revealed by histology, and DAET sensitivity to mechanically induced fatigue microdamage. The non-linear elastic parameter b was computed for all these protocols. The study demonstrated the presence of high viscoelastic and dissipative non-linearity only in the region of the calcaneus close to the anterior talocalcaneal articulation (region of high bone density). Protocols 1 and 2 also showed that most unsorted calcanei did not naturally exhibit high non-linearity, which is correlated with a low level of microcracks. Nevertheless, when microdamage was actually present, high levels of US non-linearity were always found, with characteristic non-linear signatures such as hysteresis and tension/compression asymmetry. Finally, protocol 3 demonstrated the high sensitivity of DAET measurement to fatigue-induced microdamage.

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  • Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

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    For various applications, precision of the Young’s modulus of cancellous bone specimens is needed. However, measurement variability is rarely given. The aim of this study was to assess the Young’s modulus repeatability ...
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