Dagger sign (spine)

Last revised by Wasif Yasin on 27 Nov 2023

Citation, DOI, disclosures and article data

Citation:

Gaillard F, Yasin W, Weerakkody Y, et al. Dagger sign (spine). Reference article, Radiopaedia.org (Accessed on 30 Nov 2023) https://doi.org/10.53347/rID-1200

DOI:

https://doi.org/10.53347/rID-1200

Permalink:

https://radiopaedia.org/articles/1200

rID:

1200

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:

27 Nov 2023, Wasif Yasin

Disclosures:

At the time the article was last revised Wasif Yasin had no financial relationships to ineligible companies to disclose.

View Wasif Yasin's current disclosures

Revisions:

31 times, by 17 contributors - see full revision history and disclosures

Systems:

Musculoskeletal, Spine

Sections:

Signs

Tags:

dagger sign, spine, ankylosing spondylitis

Synonyms:

The dagger sign

The dagger sign is a radiographic feature seen in ankylosing spondylitis as a single central radiodense line on frontal radiographs related to ossification of the supraspinous and interspinous ligaments secondary to enthesitis ¹. It is possible for the radiodense line to extend into the sacrum ².