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Fig. 2. —64-year-old man with multiple patellar cartilage lesions. Axial two-dimensional three-point Dixon MR image (TR/TE, 1200/36) shows increased signal in lateral facet of patellar cartilage (black arrow) that was read as grade 1 lesion and confirmed by arthroscopy. Medial patellar facet shows partial thickness loss of articular cartilage that was interpreted as grade 3 lesion and confirmed by arthroscopy (open arrow). Adjacent to partial thickness defect, surface irregularity is noted (arrowhead) that was read as grade 2 lesion and confirmed by arthroscopy. Underlying bone marrow edema (white arrow) was thought to represent early arthritic changes.