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"SPONTANEOUS OSTEONECROSIS OF THE KNEE"

“ This is actually an insufficiency fracture and not a true osteonecrosis. It is most common in women in their 70s and is associated with a ...

This is actually an insufficiency fracture and not a true osteonecrosis. It is most common in women in their 70s and is associated with a sudden onset of pain. It is thought to be associated with a meniscal tear and microfractures.
PLAIN FILM

•  Flattening of the medial femoral condyle.
•  Radiolucent focus in the subchondral bone.
•  Later, there is subchondral fracture and periosteal reaction.