Activity Score | Each Joint Location | Joint Level | Patient Level |
---|---|---|---|
Edema or Enhancement | |||
Extent | 0–3 | 0–12 | 0–24 |
Intensity | 0–1 | 0–4 | 0–8 |
Depth | 0–1 | 0–4 | 0–8 |
Total activity score | 0–5 | 0–20 | 0–40 |
Chronic Score | |||
Fatty Marrow Deposition | |||
Extent | 0–3 | 0–12 | 0–24 |
Depth | 0–1 | 0–4 | 0–8 |
Bone Erosion | 0–3 | 0–6 | 0–12 |
Additional ankylosis | 0–2 | 0–2 | 0–4 |
Total chronic score | 0–9 | 0–24 | 0–48 |
SIJ: sacroiliac joint; STIR: short tau inversion recovery; T1FS: T1 fat saturated.