Load and streaming potential responses of articular cartilage as a function of compression speed during indentation

Abstract — Editorial summary

This conference study examined how indentation speed changes cartilage load and streaming-potential responses. Measurements with an instrumented spherical tip showed that force and electrical signals increased together at lower speeds, then approached a plateau above approximately 500 micrometres per second under the tested conditions. Saline concentration strongly influenced the electrical response. Spatial potential profiles were consistent with the changing distribution of fluid flow and pressure beneath the tip. The results provide experimental support for poroelastic load bearing and help explain why loading conditions must be controlled when interpreting probe measurements.

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