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Nonlinear ultrasound monitoring of single crack propagation in cortical bone

Article dans une revue avec comité de lecture
Author
HAUPERT, Sylvain
ccGUÉRARD, Sandra
MITTON, David
222174 Laboratoire de Biomécanique et Mécanique des Chocs [LBMC UMR T9406]
PEYRIN, Françoise
2568 European Synchrotron Radiation Facility [ESRF]
LAUGIER, Pascal
245879 Laboratoire d'Imagerie Biomédicale [Paris] [LIB]

URI
http://hdl.handle.net/10985/8259
DOI
10.1121/1.4757253
Date
2012
Journal
Proceedings of meetings on acoustics

Abstract

Accumulation of bone microdamage is suspected to lead to severe impairment of mechanical properties with an increase in skeletal fragility and fracture risk. The objective of the study was to evaluate the sensitivity of nonlinear resonant ultrasound spectroscopy (NRUS) measurements to the propagation in cortical bone of a single microcrack induced by 4-point bending mechanical loading. Twelve human cortical bone specimens were machined as parallelepiped beams (50*2*2mm) to unambiguously identify resonant modes for NRUS measurements. A central notch of 600{lower case mu}m was made to control crack initiation and propagation during four-point bending loading. The nonlinear hysteretic elastic coefficient ({lower case alpha} f ) was derived from NRUS measurements achieved in dry and wet conditions. Each bone specimen was probed by a swept-sine around its first compression mode, applying progressively increasing drive levels. Moreover, the buried crack length was assessed by synchrotron radiation micro-computed tomography with a spatial resolution of 1.4{lower case mu}m. Despite between-sample variability, {lower case alpha} f increased significantly in the damaged state (44.9±85.4) compared to the initial value (5.5±1.5) in the control undamaged state. Crack length was significantly correlated to the nonlinear elastic parameter {lower case alpha} f (r ² =0.78, p<0.001). These results suggest that NRUS is sensitive to damage accumulation and can be used as a marker of bone damage.

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