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Medial tibial plateau semi-quantitative histological evaluation of articular cartilage structure (A) and proteoglycan content (B). Results are expressed as means with standard deviations as error bars for eight or nine animals per group. The OARSI scoring system was used for articular cartilage structure and proteoglycan content. HA, hyaluronic acid; PNIPAM, poly(N-isopropylacrylamide).
