PMID: 9183806May 1, 1997Paper

Low-frequency ultrasonic velocity measurements in human calcaneal trabecular bone

Physiological Measurement
R StrelitzkiJ A Evans

Abstract

Ultrasonic velocities were measured in three orthogonal directions for 17 cubes (2 x 2 x 2 cm approximately) of defatted calcaneal trabecular bone using a novel pulse transmission method with 37 kHz transducers. Since the wavelength was greater than the cross-sectional dimensions of the specimens, it was assumed that bar wave propagation was occurring and this allowed Young's modulus to be derived from velocity and apparent density. Velocity varied from 1585 +/- 104 m s-1 in axis 1 (proximo-distal) to 947 +/- 131 m s-1 in axis 3 (medio-lateral). Thus, the velocities measured in axis 3 were considerably lower than those typically seen in clinical measurements of the calcaneus. The derived Young's moduli ranged from 834 +/- 248 MPa (axis 1) to 299 +/- 98 MPa (axis 3), and were comparable in magnitude to some previously published data from mechanical testing. The results suggest that velocities measured with this technique do indeed correspond to bar velocities, and consequently that low-frequency ultrasound can be used to directly predict the mechanical properties of trabecular bone specimens in vitro. On the other hand, given the marked differences in geometry, wavelengths used and the presence of fat, it raises questions about ...Continue Reading

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Jun 1, 1994·Physics in Medicine and Biology·P H NicholsonM W Davie

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Citations

Oct 8, 1999·Medical Engineering & Physics·R StrelitzkiP H Nicholson
Nov 7, 2008·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·K Raum
Oct 12, 2002·Physics in Medicine and Biology·Brent K HoffmeisterJae Y Rho
Feb 8, 2006·Clinical Orthopaedics and Related Research·R Hürrem OzdurakFeza Korkusuz

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