High tibial osteotomy with human umbilical cord blood-derived mesenchymal stem cells implantation for knee cartilage regeneration

Figure 4 Second-look arthroscopic findings. A: Cartilage lesions classified as International Cartilage Repair Society (ICRS) grade IV in the medial femoral condyle (MFC) (arrow) and tibial plateau in a 61-year-old female patient; B: Cartilage was regenerated to ICRS grade I (arrow) ^via second-look arthroscopy, performed 13 mo after the initial operation; C: A cartilage lesion classified as ICRS grade IV in the MFC (arrow) of a 52-year-old male patient; D: Cartilage was regenerated to ICRS grade II (arrow) via second-look arthroscopy, performed 22 mo after the initial operation; E: A cartilage lesion of ICRS grade IV in the MFC (arrow) of a 68-year-old female patient; F: Cartilage was regenerated to ICRS grade III (arrow) via second-look arthroscopy, performed 16 mo after the initial operation.