Figure 3From: Direct transplantation of mesenchymal stem cells into the knee joints of Hartley strain guinea pigs with spontaneous osteoarthritisHistological findings. Photomicrographs showing serial frontal sections 10 μm thick stained with (A to D) H & E and (E to H) safranin O. Bar = 100 μm in all sections. (I) Histological grade of knee osteoarthritis assessed by modified Mankin criteria 5 weeks after injection, according to the treatment modality. Data are mean ± standard deviation of five guinea pigs in each group. *P < 0.05. HA, hyaluronic acid; MSC, mesenchymal stem cell.Back to article page