Skeletal Radiology

, Volume 42, Issue 2, pp 219–224 | Cite as

Evaluation of disease activity in ankylosing spondylitis; diagnostic value of color Doppler ultrasonography

  • Afshin Mohammadi
  • Mohammad Ghasemi-rad
  • Miramir Aghdashi
  • Nikol Mladkova
  • Paria Baradaransafa
Scientific Article



Spondyloarthropathies including ankylosing spondylitis (AS) require early diagnosis to prevent irreversible changes. Sacroiliitis is a common initial manifestation of AS and is frequently diagnosed by magnetic resonance imaging (MRI). The goal of our study was to assess color Doppler ultrasonography as a potential diagnostic tool in suspected sacroiliitis in comparison with MRI representing the gold standard.

Materials and methods

Fifty-one consecutive patients with AS and sacroiliitis and 30 control subjects underwent contrast-enhanced MRI and high resolution color Doppler and duplex ultrasonography of both sacroiliac joints (SIJ) for the detection of vascularization and blood flow spectral Doppler waveform analysis.


MRI demonstrated active disease in 27 and inactive disease in 24 patients. CDUS detected pulsatile monophasic wave spectral waveform flow in 22 patients with the active disease, and triphasic in 7 patients with inactive disease and in 8 control patients. The sensitivity, specificity, positive predictive value and negative predictive value for active sacroiliitis detection with CDUS were 82 % (95 % CI, 68–91 %), 92 % (95 % CI, 85–96 %), 91 % (95 % CI, 84–96 %), and 84 % (95 % CI, 70–92 %), respectively, for pulsatile monophasic wave spectral waveform Doppler sonography. MRI of SIJ was negative in all 30 (60 SIJ) control participants.


Our results show that CDUS is a practical and useful tool in the diagnosis of active sacroiliitis.


Ankylosing spondylitis Sacroiliitis MRI Color Doppler ultrasound 


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Copyright information

© ISS 2012

Authors and Affiliations

  • Afshin Mohammadi
    • 1
  • Mohammad Ghasemi-rad
    • 2
  • Miramir Aghdashi
    • 3
  • Nikol Mladkova
    • 4
  • Paria Baradaransafa
    • 5
  1. 1.Department of RadiologyUrmia University of Medical SciencesUrmiaIran
  2. 2.Genius and Talented Student Organization, Student Research CommitteeUrmia University of Medical SciencesUrmiaIran
  3. 3.Department of RheumatologyUrmia University of Medical SciencesUrmiaIran
  4. 4.Blizard Institute of Cell and Molecular ScienceQueen Mary University LondonLondonUK
  5. 5.Student Research CommitteeTabriz Azad UniversityTabrizIran

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