Figure 12b. (a) Arthroscopic image obtained before autologous chondrocyte implantation in a 40-year-old man shows an ulcer of the right femoral trochlea. (b) Axial spoiled GRE (6.1/1.6; flip angle, 15°) image obtained 11 months after implantation shows near-perfect incorporation of cartilage at the recipient site, with a minor irregularity of the cartilage at the central part of the trochlea (arrow). F = femur, P = patella.