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Table 4 Impact of assessment of the ligamentous sacroiliac joint compartments on diagnosis of SpA versus nonSpA (mean percentage of subjects over five readers)

From: Does evaluation of the ligamentous compartment enhance diagnostic utility of sacroiliac joint MRI in axial spondyloarthritis?

Cohort A (n=89) B (n=88)
Group nr-axSpA AS NSBP HC nr-axSpA AS NSBP
Number of subjects 20 10 39 20 31 24 33
Lig essential for diagnosis of SpA vs Non-SpA 0 0 0 0 0.6c 0 0
Lig contributory for diagnosis of SpA vs Non-SpA 28.0 64.0 2.1 1.0 7.7 26.7 0
Lig non-contributory for diagnosis of SpA vs Non-SpA 72.0 36.0 97.9 99.0 91.6 73.3 100
Lig inducing change in diagnosisa 0 0 0 0 0 0 0
Lig inducing increase in confidence in diagnosisb 0 0 0 0 0.6c 0 0
  1. aChange in diagnosis: assessment of the cartilaginous compartment alone indicating nonSpA (confidence 0–5) changed to SpA (confidence 5–10) by additional evaluation of the ligamentous compartment
  2. bIncrease in confidence of diagnosis: confidence in diagnosis of SpA increased from 5–7 to 8–10 following additional evaluation of the ligamentous compartment
  3. cOne nr-axSpA patient by one reader in cohort B
  4. AS Ankylosing spondylitis, HC Healthy control, Lig Ligamentous compartment of the sacroiliac joint, nr-axSpA Nonradiographic axial spondyloarthritis, NSBP Nonspecific back pain, SpA Spondyloarthritis