Figure 9. Variations in signal intensity of repair tissue on GRE (8.8/4.2; flip angle, 60°) images obtained in three patients after autologous chondrocyte implantation at the right femoral trochlea. Sagittal image obtained in a 39-year-old man 12 months after implantation shows hypointense signal with perfect depth of cartilage filling at the repair site (arrow).