Figure 5

Polarized microscopic findings of repair tissue at the articular cartilage defect in group A at 16 weeks after transplantation of hUCB-MSCs and hydrogel (by Sirius red staining). The collagen organization pattern of repair tissue in group A was similar to that shown by surrounding normal articular cartilage with a horizontal pattern in the superficial zone and a somewhat vertical orientation in the deep zone. hUCB-MSCs, human umbilical cord blood derived mesenchymal stem cells.