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General observation of cartilage regeneration in vivo. (A) Articular cartilage defect before and after hydrogel implantation. (B) General observation of cartilage repair in three groups at 8 and 12 weeks post-implantation. (C) Scoring at 8 weeks. (D) Scoring at 12 weeks (****P < 0.0001, ***P < 0.001, **P < 0.01, *P < 0.05).
