BASRI scoring method
| Grade | Description | |
|---|---|---|
| *Increase grades I and II by one grade each if two of the following bony changes are present: erosions, osteophytes, protrusio. | ||
| AP, anteroposterior; BASRI, Bath Ankylosing Spondylitis Radiographic Index. | ||
| Note: BASRI spine is the sum of sacroiliac joints (combined as one score 0–4), AP and lateral lumbar spine combined as one score 0–4, and lateral cervical spine 0–4; BASRI total is the sum of BASRI spine and BASRI hips (as one score 0–4). | ||
| Sacroiliac joints (NY Criteria) | ||
| 0 | Normal | No change |
| I | Suspicious | Suspicious change |
| II | Minimal | Small localised areas with erosion or sclerosis without alteration in joint width |
| III | Moderate | Moderate or advanced sacroilitis with erosions, evidence of sclerosis, widening, narrowing, or partial ankylosing |
| IV | Severe | Severe abnormality with total ankylosis |
| Hip | ||
| 0 | Normal | No change |
| I* | Suspicious | (Possible) focal joint space narrowing |
| II* | Minimal | Definite narrowing leaving a circumferential joint space >2 mm |
| III | Moderate | Narrowing with circumferential joint space ≤2 mm or bone-on-bone apposition of <2 cm |
| IV | Severe | Bone deformity or bone-on-bone apposition >2 cm |
| AP and lateral lumbar and lateral cervical spine | ||
| 0 | Normal | No change |
| I | Suspicious | Suspicious but no definite change |
| II | Minimal | Any number of erosions, squaring, sclerosis ± syndesmophytes on ≤2 vertebrae |
| III | Moderate | Syndesmophytes on ≥3 vertebrae ± fusion involving 2 vertebrae |
| IV | Severe | Fusion involving ≥3 vertebrae |
| BASRI spine | Maximum=12 | |
| BASRI total | Maximum=16 | |