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Table 3 Bone marrow edema and fat metaplasia in the cartilaginous versus ligamentous sacroiliac joint compartment (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
BME cart+/lig+ 42.0 80.0 2.1 4.0 11.6 37.5 2.4
BME cart+/lig– 41.0 8.0 25.6 30.0 33.5 36.7 25.5
BME cart–/lig+ 0 0 1.5a 2.0a 0 0.8a 0
BME cart–/lig– 17.0 12.0 70.8 64.0 54.8 25.0 72.1
Fat cart+/lig+ 21.0 42.0 17.4 12.0 25.2 41.7 8.5
Fat cart+/lig– 26.0 24.0 11.8 6.0 18.7 37.5 13.9
Fat cart–/lig+ 0 4.0b 0.5b 0 0 0.8b 0.6b
Fat cart–/lig– 53.0 30.0 70.3 82.0 56.1 20.0 77.0
  1. aBME cart–/lig+: three NSBP patients and two HC by one single reader in cohort A; one AS patient by one reader in cohort B
  2. bFat cart–/lig+: two AS and one NSBP patient by three different readers in cohort A; one AS and one NSBP patient by two different readers in cohort B
  3. AS Ankylosing spondylitis, BME Bone marrow edema, Cart Cartilaginous compartment of the sacroiliac joint, Fat Fat metaplasia, HC Healthy control, Lig Ligamentous compartment of the sacroiliac joint, nr-axSpA Nonradiographic axial spondyloarthritis, NSBP Nonspecific back pain