| Eric A. Brandser, M.D.
Peer Review Status: Internally Peer Reviewed
 
An AP radiograph of the pelvis from 1975 shows that the sacroiliac
joints are normal radiographically. A subsequent radiograph
in 1981 shows that there is irregularity of the sacroiliac
joints, more so on the iliac side of the joint. This is due
to the fact that the cartilage thickness of the ilium is less
than that of the sacrum and hence bone erosions appear first
on the iliac side. A follow-up radiograph in 1982 demonstrates
that both the sacral and iliac sides of both sacroiliac joints
show conspicuous erosion and sclerosis. The findings are characteristic
of the symmetric seronegative spondylarthropathies, including
ankylosing spondylitis and arthritis associated with inflammatory
bowel disease.
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