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Fig. 2. —Grade 1 and 2 cartilage lesions. Axial image acquired with multiple-echo data image combination (MEDIC) sequence (TR/TE, 884/26; flip angle, 30°) shows grade 1 (curved arrows) and arthroscopically verified grade 2 (straight arrows) cartilage lesions in 57-year-old man. Cartilage signal irregularity in lateral facet (grade 1 lesion; curved arrows) and thinning of cartilage to less than half of thickness of normal cartilage (grade 2; straight arrows) are seen in central part of retropatellar cartilage.