Table 3 Comparison of inflammation observed on MRI with structural changes on conventional radiographs based on the modified New York criteria.
| Inflammation on MRI | Radiographs of SI joint* | Total | |
|---|---|---|---|
| Sacroiliitis | Normal | ||
| (a) Per joint analysis | |||
| Present | 22 | 14 | 36 |
| Absent | 15 | 85 | 100 |
| Total | 37 | 99 | 136 |
| (b) Per patient analysis | |||
| present in both SI joints | 9 | 5 | 14 |
| present in one SI joint | 3 | 5 | 8 |
| 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.