Abstract

Abstract Stress generated potentials in fluid-filled bone have been measured in four point bending as a function of KCl concentration, NaCl concentration, and fluid viscosity. Results indicate that the potentials decrease with increasing fluid viscosity and with increasing fluid conductivity. The potentials’ decay constants during step loading are independent of fluid conductivity and are linearly proportional to fluid viscosity. At sufficiently high KCl and NaCl ion concentrations in this fluid, the zeta potential reverses sign and all signals have opposite polarity. This phenomenon is reversible and reproducible. These derivations are consistent with the streaming potential theory and strongly support electrokinetic mechanisms as the origin of stress generated potentials in fluid-filled bone.

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