Table 2.
Scoring system for assessing active inflammation of the sacroiliac joint by MRI according to the JAMRIS-SIJ scoring system.
| Item | Definition | Score | |
|---|---|---|---|
| Segmentation/Slice | Range/Slice | ||
| BME | An ill-defined area of high bone marrow signal intensity within the subchondral bone in the ilium or sacrum on fluid-sensitive images | 4 quadrants/SIJ | 0–8 |
| BME Intensity | Presence of hyperintensity of the marrow on fluid-sensitive images using the signal of the presacral veins or cerebrospinal fluid (CSF) as reference | 1 score/SIJ | 0–2 |
| BME depth | Continuing increased signal on fluid-sensitive images at depths ≥5 mm/≥1 cm from the articular surface | 1 score/SIJ | 0–2 |
| Osteitis | An ill-defined area of high bone marrow signal intensity within the subchondral bone in the ilium or sacrum on contrast-enhanced T1-weighted sequences | 4 quadrants/SIJ | 0–8 |
| Joint space fluid | High signal intensity equivalent to the CSF on fluid-sensitive sequences within the joint space of the cartilaginous portion of SIJ | halves/SIJ | 0–4 |
| Joint space enhancement | Increased signal intensity on contrast-enhanced T1-weighted sequences within the joint space of the cartilaginous portion of SIJ | halves/SIJ | 0–4 |
| Inflammation in erosion cavity | Increased signal intensity on fluid-sensitive or contrast-enhanced T1-weighted sequences in an erosion cavity of cartilaginous portion of SIJ | halves/SIJ | 0–4 |
| Enthesitis | Increased signal intensity in bone marrow and/or adjacent soft tissue on fluid-sensitive or contrast-enhanced T1-weighted sequences at sites where ligaments and tendons attach to a bone, excluding retroarticular enthesitis | score per case | 0–1 |
| Capsulitis | Increased signal on fluid-sensitive or contrast-enhanced T1-weighted sequences involving superior portion of SIJ capsule | superior halves/SIJ | 0–2 |