Fig. 4From: pH-responsive and hyaluronic acid-functionalized metal–organic frameworks for therapy of osteoarthritisa Macroscopic appearance and b Macroscopic scores of distal femur and tibial plateau from rats after treatment for 4 and 8 weeks. Data was presented as the mean ± SD (n = 6). *, #p < 0.05; **, ##p < 0.01; ***, ###p < 0.001Back to article page