Table 7.
Associations between MRI finding in the spine and the diagnosis of AS and IBP
| MRI findings | Sensitivity of MRI findings (95% CI) |
Specificity of MRI findings (95% CI) |
Cases, number | Controls, number | |
|---|---|---|---|---|---|
| AS | IBP | No LBP | |||
| ≥ 1 CIL | 0.77 (0.61-0.88) | 0.77 (0.61-0.88) | 35 | 35 | |
| ≥ 2 CIL | 0.69 (0.52-0.81) | 0.94 (0.81-0.98) | 35 | 35 | |
| ≥ 3 CIL | 0.66 (0.49-0.79) | 0.94 (0.81-0.98) | 35 | 35 | |
| ≥ 1 tCIL | 0.69 (0.52-0.81) | 0.83 (0.67-0.92) | 35 | 35 | |
| ≥ 2 tCIL | 0.57 (0.41-0.72) | 0.94 (0.81-0.98) | 35 | 35 | |
| ≥ 3 tCIL | 0.46 (0.30-0.62) | 0.97 (0.85-0.99) | 35 | 35 | |
| ≥ 1 lCIL | 0.51 (0.36-0.67) | 0.94 (0.81-0.98) | 35 | 35 | |
| ≥ 1 NIL | 0.06 (0.02-0.19) | 0.97 (0.85-0.99) | 35 | 35 | |
| ≥ 1 LIL | 0.31 (0.19-0.48) | 0.97 (0.85-0.99) | 35 | 35 | |
| ≥ 1 FIL/PIL | 0.09 (0.03-0.22) | 1.00 (0.90-1.00) | 35 | 35 | |
| ≥ 1 CIL | 0.40 (0.23-0.59) | 0.88 (0.70-0.96) | 25 | 25 | |
| ≥ 2 CIL | 0.32 (0.17-0.52) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 3 CIL | 0.12 (0.04-0.30) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 1 tCIL | 0.32 (0.17-0.52) | 0.88 (0.70-0.96) | 25 | 25 | |
| ≥ 2 tCIL | 0.24 (0.11-0.43) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 3 tCIL | 0.12 (0.04-0.30) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 1 lCIL | 0.24 (0.11-0.43) | 1.00 (0.87-1.00) | 25 | 25 | |
| ≥ 1 NIL | 0.04 (0.01-0.20) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 1 lCIL | 0.12 (0.04-0.30) | 0.96 (0.80-0.99) | 25 | 25 | |
| ≥ 1 FIL/PIL | 0.00 (0.00-0.13) | 1.00 (0.87-1.00) | 25 | 25 | |
Sensitivity and specificity based on concordant observations of three readers; results from Weber et al. (2009). AS, Ankylosing spondylitis; IBP, inflammatory back pain; no LBP, no low-back pain; CIL, vertebral corner inflammatory lesion; tCIL, thoracic CIL; lCIL lumbar CIL; NIL, vertebral noncorner inflammatory lesion; LIL, lateral inflammatory lesion; FIL/PIL, facet or other posterior element inflammatory lesion.