Table 2

‚ÄÉComparison of structural changes observed on MRI with structural changes on conventional radiographs based on the modified New York criteria

Structural changes on MRIRadiographs of SI joint*Total
AbnormalNormal
*Patients fulfilled the modified New York criteria on MRI if structural changes were present and on conventional radiography if there were bilateral changes of at least grade 2 or unilateral of at least grade 3.
MRI, magnetic resonance imaging; SI, sacroiliac.
(a) Single sacroiliac joint analysis
Present18220
Absent1997116
Total3799136
(b) Per patient analysis
Present in both SI joints808
Present in one SI joint224
Absent45256
Total145468