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Avascular Necrosis and Medullary Infarcts: Knee
Coronal STIR image of the knee shows the irregularly marginated lesions to have a zone of bright internal signal corresponding to granulation tissue, a low-signal rim consistent with sclerosis, and a low-signal center of nonviable bone. This configuration of peripheral low signal with a line of bright signal is analogous to the “rim“ sign of avascular necrosis in the hip. The MRI is more sensitive than plain radiographs in picking up the changes of avascular necrosis, particularly early on in the course of the disease. The MRI may pick up changes in an asymptomatic joint opposite to the suspected one.
Photo Details
Title:
Avascular Necrosis and Medullary Infarcts: Knee
Description:
Coronal STIR image of the knee shows the irregularly marginated lesions to have a zone of bright internal signal corresponding to granulation tissue, a low-signal rim consistent with sclerosis, and a low-signal center of nonviable bone. This configuration of peripheral low signal with a line of bright signal is analogous to the “rim“ sign of avascular necrosis in the hip. The MRI is more sensitive than plain radiographs in picking up the changes of avascular necrosis, particularly early on in the course of the disease. The MRI may pick up changes in an asymptomatic joint opposite to the suspected one.
Reference Number:
03-16-0015
Body Site:
Knee
Disease:
Avascular Necrosis
Image Type:
MRI
Color Mode:
Black & White
File Name:
03-16-0015.jpg
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