Streaming potentials maps are spatially resolved indicators of amplitude, frequency and ionic strength dependant responses of articular cartilage to load

Abstract — Editorial summary

A linear microelectrode array recorded how electrical potentials vary across the surface of cartilage during unconfined compression. The researchers changed loading amplitude, frequency, relaxation time and saline ionic strength. Potential amplitudes were greatest near the disk centre, whereas the electric-field gradient was greatest near its edge. These spatial patterns and their dependence on loading conditions agreed with predictions about fluid pressure and fluid motion in cartilage. The work establishes spatially resolved streaming potentials as a way to investigate cartilage electromechanics and provides a basis for subsequent nondestructive assessment methods.

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