Rim sign (avascular necrosis)

Rim sign

(osteonecrosis) • Distal femoral avascular necrosis - Ganzer Fall bei Radiopaedia

Gaillard F, Distal femoral avascular necrosis. Case study, Radiopaedia.org (Accessed on 23 Jan 2023) https://doi.org/10.53347/rID-36034 • CC by-nc-sa 3.0 (modified)

Osteochondral

defect • Avascular necrosis of the knee - Ganzer Fall bei Radiopaedia

Gaillard, F. Avascular necrosis of the knee. Case study, Radiopaedia.org. (accessed on 24 Oct 2022) https://doi.org/10.53347/rID-2583 • CC by-nc-sa 3.0 (modified)

Radiopaedia • CC-by-nc-sa 3.0 • de

A rim sign can be seen in avascular necrosis 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/AVN.

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