Further Insight into the Depth-Dependent Microstructural Response of Cartilage to Compression Using a Channel Indentation Technique

Figure 13

Following the initial stress relaxation response (or viscous response described in Figure 12), the second phase elastic response is illustrated here. The dissipation of stress 𝑃 to a lower stress level and final equilibrium is governed by the solid matrix deformation, laterally. The extent of lateral matrix deformation, as shown in the earlier microimages of increasing shear (Figure 8), is correlated with larger compressive strain levels. Thus the lateral matrix deformation is a function of “𝑃” or the amount pressure remaining following the completion of the initial viscous response.