Knee-Avascular Necrosis-MRI
This is a patient on long term steroids with knee pain. MRI Knee shows infarcts/AVN in femur and tibia along with marrow edema. There is focal serpiginous low signal line with fatty center, which is characteristic.
For bone infarction or avascular necrosis, MRI is the most sensitive modality and demonstrates changes well before and plain film changes are visible. The progression is:
- diffuse oedema
- focal serpiginous low signal line with fatty center (most common appearance)
- double line sign
- osteochondral fragmentation : rim sign
- secondary degenerative changes.
Knee-Avascular Necrosis-MRI
Reviewed by Sumer Sethi
on
Monday, September 24, 2012
Rating:
Reviewed by Sumer Sethi
on
Monday, September 24, 2012
Rating:
Sumer Sethi
Unique blend of academic excellence and entrepreneurship, heading leading firms in India- Teleradiology Providers, pioneering company providing teleradiology services and DAMS (Delhi Academy of Medical Sciences) Premier test preparation institute in India for MD/MS/MCI preparation. He has also been an invited faculty member at various conferences, including Teleradiology in IRIA 2008 and 2011, Hospital Build Middle East, Congress of the Brain Tumor Radiology in Neuro-oncology Society. Dr. Sethi is Editor-in-Chief of Internet Journal of Radiology. He has a keen interest in Web 2.0 technologies and in maintaining his famous radiology blog, which has been featured in multiple international journals.
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