Fig. 9

PDA-PEG NPs attenuate OA progression. a TRAP and b CD31 staining of the subchondral bone, ×200 magnification. c MMP-13 and d COL10 staining of the cartilage, ×400 magnification. e Quantitative analysis TRAP, CD31, MMP-13, and COL10 positively-stained cells. n = 3. Symbol “*” denotes p < 0.05, “**” denotes p < 0.01, NS indicates not significant