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. 2016 Jan 11;6:19220. doi: 10.1038/srep19220

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After smoothing of displacement fields, in-plane Green-Lagrange strains (E_xx, E_yy, E_xy) could be computed at each pixel in the femoral and tibial cartilage (A). E_xy was greatest at the middle of the cartilage-cartilage contact region. Computation of the principal strains (E_p1, E_p2) and maximum shear strains (E_sm) for each pixel in the ROIs also showed that these values were the greatest at the middle of the cartilage-cartilage contact region (B).