Measurement of Cortical Bone Elasticity Tensor with Resonant Ultrasound Spectroscopy

Area of Science:

• Materials Science
• Biophysics
• Solid Mechanics

Background:

• Resonant Ultrasound Spectroscopy (RUS) is a technique for determining material stiffness from resonant frequencies.
• It is advantageous for small, anisotropic samples, avoiding limitations of quasi-static and wave velocity methods.
• Previous applications excluded mineralized tissues due to significant damping causing overlapping resonant peaks.

Purpose of the Study:

• To describe the application of RUS for elastic characterization of mineralized tissues, specifically cortical bone.
• To detail the necessary adaptations and developments to overcome damping-related challenges in RUS measurements.
• To present methods for viscoelastic characterization using resonant peak widths.

Main Methods:

• Sample preparation and measurement setup for RUS.
• Signal processing and data analysis tailored for damping in mineralized tissues.
• Techniques for overcoming overlapping resonant peaks in frequency spectra.

Main Results:

• Successful application of RUS for elastic characterization of cortical bone.
• Developed methods to manage significant damping in mineralized tissues.
• Established procedures for viscoelastic property determination from resonant peak analysis.

Conclusions:

• RUS is a viable technique for the complete elastic characterization of mineralized tissues, including bone.
• Adaptations allow for accurate measurements despite inherent material damping.
• The described methods enable both stiffness and viscoelastic property assessment.