Fig. 6: In vivo cartilage regeneration of cartilage defects treated with the USCs, dECM hydrogels, or USCs-laden dECM hydrogels.

a Gross appearance of the cartilage at 6 and 12 weeks after the injection. b Representative H&E staining images of rat knee joints. Scale bar = 500 μm. c Safranin O/Fast Green staining of rat knees 6 and 12 weeks after the hydrogel injection (Scale bar = 500 μm).