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Fig. 2A. —59-year-old woman with central osteophyte at medial femoral condyle that fills base of articular cartilage defect. Sagittal fat-suppressed three-dimensional spoiled gradient-echo MR image (TR/TE, 40/6; flip angle, 40°) shows central osteophyte (solid straight arrow) and marginal osteophytes (curved arrows). Full-thickness articular cartilage defects (open arrows) that are separate from central osteophyte can be seen at femoral condyle and tibial plateau along with subchondral signal abnormality beneath tibial plateau defect.