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Therapeutic efficacy of hUCMSCs-EVs in OA rat model. A Macroscopic observation of articular cartilage for OA with PBS, hUCMSCs-EVs or PRP treatment, and the corresponding macroscopic scores; *p < 0.05, **p < 0.01, ***p < 0.001. H&E staining (B), Safranin-O Fast green staining (C), Histological score (D) on effects of hUCMSC-Evs for OA treatment; Scale bar: 1 mm; *p < 0.05, **p < 0.01, ***p < 0.001
