Rim sign of avascular necrosis

Dr Dan J Bell and A.Prof Frank Gaillard et al.

The rim sign of avascular necrosis (AVN) comprises a high T2 or intermediate T1 signal line sandwiched between two low signal lines, and represents fluid between the sclerotic borders of an osteochondral fragment, and implies instability (stage III).

The rim sign should not be confused with the double line sign of osteonecrosis/AVN.

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Article information

rID: 1987
Section: Signs
Tag: knee
Synonyms or Alternate Spellings:
  • Rim sign (AVN)
  • Rim sign of AVN

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