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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