Rim sign (osteonecrosis)

Last revised by Henry Knipe ◉ ◈ on 31 Aug 2022

Citation, DOI, disclosures and article data

Citation:

Gaillard F, Knipe H, Macori F, et al. Rim sign (osteonecrosis). Reference article, Radiopaedia.org (Accessed on 26 Mar 2023) https://doi.org/10.53347/rID-1987

DOI:

https://doi.org/10.53347/rID-1987

Permalink:

https://radiopaedia.org/articles/1987

rID:

1987

Article created:

2 May 2008, Frank Gaillard ◉ ◈

Disclosures:

At the time the article was created Frank Gaillard had no recorded disclosures.

View Frank Gaillard's current disclosures

Last revised:

31 Aug 2022, Henry Knipe ◉ ◈

Disclosures:

At the time the article was last revised Henry Knipe had the following disclosures:

Radiopaedia Events Pty Ltd, Speaker fees (past)
Integral Diagnostics, Shareholder (ongoing)
Micro-X Ltd, Shareholder (ongoing)

These were assessed during peer review and were determined to not be relevant to the changes that were made.

View Henry Knipe's current disclosures

Revisions:

21 times, by 7 contributors - see full revision history and disclosures

Systems:

Musculoskeletal

Sections:

Signs

Tags:

knee, rewrite

Synonyms:

Rim sign (AVN)
Rim sign of AVN
Rim sign (avascular necrosis)

A rim sign can be seen in osteonecrosis and 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).

This rim sign should not be confused with the double line sign of osteonecrosis.