Figure 5. Sagittal MR arthrogram obtained with a spoiled GRE sequence (repetition time msec/echo time msec, 6.1/1.6; flip angle, 15°) in a 36-year-old man 11 months after autologous chondrocyte implantation shows focal underfilling of a cartilage defect (arrow) at the central aspect of the right patella. F = femur, T = tibia.