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

Abstract : 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.
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-00831771
Contributeur : Compte de Service Administrateur Ensam <>
Soumis le : lundi 30 septembre 2013 - 18:08:50
Dernière modification le : jeudi 19 avril 2018 - 14:36:05
Document(s) archivé(s) le : mardi 31 décembre 2013 - 04:22:16

Fichier

LBM_guerard_2010.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

Hélène Moreschi, Samuel Calle, Sandra Guerard, David Mitton, Guillaume Renaud, et al.. Monitoring trabecular bone microdamage using a dynamic acousto-elastic testing method. Proceedings of the institution of Mechanical Engineers, Part H : Journal of Engineering in Medicine, 2011, 225 (3), pp.282-295. 〈10.1243/09544119JEIM846〉. 〈hal-00831771〉

Partager

Métriques

Consultations de la notice

485

Téléchargements de fichiers

153