Fig. 7From: MMP-13 enzyme and pH responsive theranostic nanoplatform for osteoarthritisThe macroscopic observation (a) and macroscopic score (b) of cartilage after IA-injection with PBS, PSO, MR-PPL@PSO and MRC-PPL@PSO for 2 and 6 weeks. Each data points represents mean ± S.D. (n = 5). *, # indicate p < 0.05; **, ## indicate p < 0.01; ***, ### indicate p < 0.001Back to article page