Fig. 4
From: The bench-top accuracy of the VerteTrack spinal stiffness assessment device
a Experiment one methodology: load applied by the VerteTrack (LoadVerteTrack) vs. reference load (Loadref). b Experiment two methodology: displacement measured by the VerteTrack (DisplacementVerteTrack) vs. reference displacement (Displacementref). c Experiment three methodology: stiffness measurements using multiple-level continuous indentation (Stiffnessmultiple) vs. single-level indentation (Stiffnesssingle). Legend: RIH – Rolling indenter head, d0 – displacement 0, d1 – displacement 1, d2 – displacement 2, d3 – displacement 3, d4 – displacement 4