The Journal of Bone and Joint Surgery

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An Erosive Lesion of the Lateral Femoral Condyle of the Knee in an Eighteen-Year-Old Woman¹
An eighteen-year-old woman presented with a three-year history of progressively increasing pain in the right knee. She stated that there had been no prior trauma to the knee. She reported a deep ache in the knee that was aggravated by activity, especially squatting. There was no catching, swelling, or sense of giving-way.
Physical examination revealed a full range of motion. The results of the Lachman and pivot-shift tests were normal. There was no swelling or tenderness along the joint line. The findings on radiographs of the right knee were interpreted as normal.
Magnetic resonance imaging was acquired:
Fig. 1-A	Fig. 1-B	For larger view, click on image