Crescent sign associated with femoral osteonecrosis
Crescent sign associated with femoral osteonecrosis
The radiograph demonstrated a subchondral lucency (arrows) of the femoral head (ie, crescent sign), which is evidence of subchondral collapse and pathognomonic for osteonecrosis.
Reproduced with permission from Clyde A Helms, MD.
Graphic 131110 Version 1.0
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