Dagger sign (spine)

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.

Arthritides
Inspired signs

Article information

rID: 1200
Section: Signs
Tag: stub, refs, spine
Synonyms or Alternate Spellings:
  • The dagger sign

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Cases and figures

  • Figure 1: photograph of dagger
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  • Case 1
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  • Case 2
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  • Case 3
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  • Case 4
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  • Case 11
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  • Case 12
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  • Case 13
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