The Pathway of Bone Fluid Flow as Defined by In Vivo Intramedullary Pressure and Streaming Potential Measurements
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The pathway for intracortical fluid flow response to a step-load was identified in vivo using intramedullary pressure (ImP) and streaming potential (SP) measurements, and allowed the development of a load-induced flow mechanism which considers mechanotransduction and mechanoelectrotransduction phenomena. An avian model was used for monitoring, simultaneously, ImP and SP under axial loading which generated peak strains of approximately 600 microstrain (με). ImP response to step-load decayed more quickly than SP relaxation, in which multiple time constants were observed during the relaxations. While the initial relaxation of SP showed a decay on the order of 200 ms, ImP decayed on the order of approximately 100 ms. After the initial decay (∼200 ms after loading), ImP quickly relaxed to base line, while SP continued to dominate relaxation. It appears that the decay of ImP is indicative of resistive fluid flow occurring primarily in the vasculature and other intraosseous channels such as lacunar-canalicular pores, and that SP represents the fluid flow in the smaller porosities, i.e., lacunar-canalicular system or even microspores. These results suggest that SP and ImP decays are determined by a hierarchical interdependent system of multiple porosities, and that the temporal dynamics of load-bearing define the manner in which the fluid patterns and pressures are distributed. © 2002 Biomedical Engineering Society.
PAC2002: 8719Tt, 8719Rr, 8719Nn
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- The Pathway of Bone Fluid Flow as Defined by In Vivo Intramedullary Pressure and Streaming Potential Measurements
Annals of Biomedical Engineering
Volume 30, Issue 5 , pp 693-702
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- Kluwer Academic Publishers-Plenum Publishers
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- Intramedullary pressure
- Streaming potential
- Strain frequency
- Bone fluid flow
- Cortical bone
- Fluid flow
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