Table 4 Comparison of inflammation or structural changes observed on MRI with structural changes on the conventional radiography based on the modified New York criteria.
| Inflammation and/or | Radiographs of SI joint* | Total | |
|---|---|---|---|
| structural changes on MRI | Sacroiliitis | Normal | |
| (a) Per joint analysis | |||
| Present | 24 | 14 | 38 |
| Absent | 13 | 85 | 98 |
| Total | 37 | 99 | 136 |
| (b) Per patient analysis | |||
| Present in both SI joints | 11 | 5 | 16 |
| Present in one SI joint | 1 | 5 | 6 |
| Absent | 2 | 44 | 46 |
| Total | 14 | 54 | 68 |
*Radiographs of the sacroiliac joints were scored according to the modified New York criteria, which were met if bilateral grade 2 or unilateral grade 3 or 4 sacroiliitis was scored.
MRI, magnetic resonance imaging; SI, sacroiliac.