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Chondrocyte uptake of PPD‐sEVs. (A) Representative images of the chondrocyte uptake of DiO (Green) labelled sEVs or PPD‐sEVs, scale bar: 50 μm; (B) Positive chondrocyte rate for uptake of DiO labled sEVs or PPD‐sEVs; (C) Mean fluorescence intensity (MFI) of DiO‐labelled sEVs and PPD‐sEVs in each group (n = 3) **P < 0.01
