Figure 7. Sagittal spoiled GRE (6.1/1.6; flip angle, 15°) MR arthrogram, obtained in a 30-year-old man 10 months after a right patellar autologous chondrocyte implantation, shows displaced delamination with folding of a retropatellar cartilage flap (arrow) in the superior direction and resultant denudation of the inferior articular surface. F = femur, P = patella, T = tibia.