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Figure 15a. (a) Axial spoiled GRE (6.1/1.6; flip angle, 15°) MR arthrogram obtained in a 40-year-old man 8 months after autologous chondrocyte implantation shows a focal cartilage defect (arrow) at the medial patellar facet of the left knee. (b) Axial GRE (8.8/4.2; flip angle, 60°) MR image obtained without the use of intraarticular contrast material does not show the defect (arrow). F = femur, P = patella.
