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Table 6 Associations between MRI finding in the SIJ and the diagnosis of AS and IBP

From: A systematic critical review on MRI in spondyloarthritis

MRI findings Sensitivity of MRI findings (95% CI) Specificity of MRI findings (95% CI) Cases, number Controls, number
    AS IBP NLSBP No LBP
BMO 0.85 (0.76-0.92) 0.93 (0.84-0.97) 75    59
Erosions 0.91 (0.82-0.95) 0.98 (0.91-1.00) 75    59
Fat infiltration 0.91 (0.82-0.95) 0.86 (0.76-0.93) 75    59
Ankylosis 0.27 (0.18-0.38) 1.00 (0.94-1.00) 75    59
Global assessment 0.99 0.96 75    59
BMO 0.85 (0.76-0.92) 0.77 (0.58-0.89) 75   26  
Erosions 0.91 (0.82-0.95) 0.96 (0.81-0.99) 75   26  
Fat infiltration 0.91 (0.82-0.95) 0.85 (0.67-0.94) 75   26  
Ankylosis 0.26 (0.18-0.38) 1.00 (0.87-1.00) 75   26  
Global assessment 0.99 0.92 75   26  
BMO 0.67 (0.48-0.81) 0.93 (0.84-0.97)   27   59
Erosions 0.48 (0.31-0.66) 0.98 (0.91-1.00)   27   59
Fat infiltration 0.37 (0.22-0.56) 0.86 (0.76-0.93)   27   59
Global assessment 0.52 0.96   27   59
BMO 0.67 (0.48-0.81) 0.77 (0.58-0.89)   27 26  
Erosions 0.48 (0.31-0.66) 0.96 (0.81-0.99)   27 26  
Fat infiltration 0.37 (0.22-0.56) 0.85 (0.67-0.94)   27 26  
Global assessment 0.52 0.92   27 26  
  1. Results from Weber et al. (2010). Sensitivity and specificity based on concordant observations of a minimum of two of five readers. 95% CI calculated from raw data. MRI, magnetic resonance imaging; SIJ, sacroiliac joint; AS, ankylosing spondylitis; IBP, inflammatory back pain; CI, confidence interval; NSLBP, nonspecific low-back pain; BMO, bone marrow edema; global assessments, 95% CI not possible to calculate, because of no raw data.