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Representative Toluidine blue photomicrographs used for the grading of articular cartilage structure and the grading of proteoglycan contents. Photomicrographs showing the medial femoral condyle (above) and the medial tibial plateau (below) of non-operated left and operated right knees for the PBS (A,B), HA (C,D), HA-L-PNIPAM (E,F), HA + Cells (G,H), and HA-L-PNIPAM + Cells (I,J) groups, respectively. Scale bars = 500 µm. HA, hyaluronic acid; PNIPAM, poly(N-isopropylacrylamide).
