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

Figure 3 Arthroscopic findings of stem cell implantation procedures. A: Medial compartment osteoarthritis (arrow) in a 61-year-old woman; B: Multiple holes, 4 mm in diameter and 4 mm in depth (arrow), were drilled using a drill bit; C: Human umbilical cord blood-derived mesenchymal stem cells were mixed with hyaluronic acid hydrogel and implanted in the holes (arrow).