Skip to Main content Skip to Navigation
Theses

Evaluation ultrasonore de l'os cortical par des méthodes d'acoustique linéaire et non linéaire. Application à l'évaluation du micro endommagement osseux.

Abstract : This work is about ultrasonic characterization of cortical bone quality in vitro.
In the first part, different axial transmission technique for cortical bone assessment are compared. Ultrasonic properties measured at different frequencies at the radius in vitro are compared to quantitative tomography (pQCT) properties, as well as to mechanical properties. There is no doubt that the ultrasonic parameters are capable to predict bone mechanical properties, but they may only be able to bring additional information over that brought by the pQCT parameters (currently clinically used) in a multi-parameters, multi-frequencies approach.
In the second part, another parameter influencing bone quality is studied : micro damage. We used nonlinear acoustic techniques, used in other fields for material's damage assessment. Using Nonlinear Ultrasound Spectroscopy techniques, we demonstrated the sensitivity of nonlinear acoustic parameters to progressively accumulated damage in bone in vitro. Interestingly, an exponential relationship between the nonlinear acoustic parameter and the age of donors has been found. This allowed to show the potential of nonlinear acoustics for bone micro damage characterization, even though more work has to be conducted for the in vivo application of the technique.
The main result of this work is the fact that the potential of ultrasound for fracture risk assessment probably relies on a multi-frequencies, multi-parameters approach.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00123909
Contributor : Marie Muller <>
Submitted on : Thursday, January 11, 2007 - 2:23:10 PM
Last modification on : Wednesday, December 9, 2020 - 3:17:01 PM
Long-term archiving on: : Saturday, May 14, 2011 - 1:42:42 AM

Identifiers

  • HAL Id : tel-00123909, version 1

Citation

Marie Muller. Evaluation ultrasonore de l'os cortical par des méthodes d'acoustique linéaire et non linéaire. Application à l'évaluation du micro endommagement osseux.. Acoustique [physics.class-ph]. Université Paris-Diderot - Paris VII, 2006. Français. ⟨tel-00123909⟩

Share

Metrics

Record views

550

Files downloads

623