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. 2013 Sep 2;84(4):410–414. doi: 10.3109/17453674.2013.810521

Figure 1.

Figure 1.

An 83-year-old woman developed osteonecrosis and secondary osteoarthritis in the medial femur condyle. The initial radiographs at diagnosis (A) and those after 1 year (B) showed a small but typical radiolucent subchondral lesion in the weight-bearing area of the medial femoral condyle. The patient had a total knee arthroplasty 2 years after diagnosis (C).