A broadband viscoelastic spectroscopic study of bovine bone: implications for fluid flow |
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Authors: | Buechner P M Lakes R S Swan C Brand R A |
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Affiliation: | (1) Engineering Mechanics Program, University of Wisconsin-Madison, 147 Engineering Research Building, 1500 Engineering Drive, Madison, WI;(2) Department of Biomedical Engineering, Department of Engineering Physics, Materials Science Program, and Rheology Research Center, University of Wisconsin-Madison, 147 Engineering Research Building, 1500 Engineering Drive, Madison, WI;(3) Department of Civil and Environmental Engineering, University of Iowa, Iowa City, IA;(4) Department of Orthopaedic Surgery, University of Iowa, Iowa City, IA |
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Abstract: | To explore the hypothesis that mechanical excitation-induced fluid flow and/or fluid pressure are potential mechanical transduction mechanisms in bone adaptation, a complementary experimental and analytical modeling effort has been undertaken. Experimentally, viscoelastic tan properties of saturated cortical bovine bone were measured in both torsion and bending, and significant tan values in the 100-105Hz range were observed, although the nature of the damping is not consistent with a fluid pressure hypothesis. Analytically, micromechanically based poroelasticity models were exercised to quantify energy dissipation associated with load-induced fluid flow in large scale channels. The modeling results indicate that significant damping due to fluid flow occurs only above 1 MHz frequencies. Together, the experimental and analytical results indicate that at excitation frequencies presumed to be physiological (1–100 Hz), mechanical loading of bone generates extremely small pore fluid pressures, making the hypothesized fluid-pressure transduction mechanism upon osteocytes untenable. © 2001 Biomedical Engineering Society.PAC01: 8380Lz, 8710+e, 8385Cg |
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Keywords: | Fluid flow Bone Porosity Viscoelasticity |
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