Fig. 4

Magnetic resonance of knee joint of rabbits in each group after 4w treatment. A represents control group, B represents OA group, C represents MSC group. D represents siRNA-MSC group. 1 and 2 represent sagittal and coronal magnetic resonance images in each group. The arrows pointe to the fluid in the joint cavity in each group. E and F represent the synovitis and osteophyte score of different groups. * P < 0.05, significant difference between groups