| Eric A. Brandser, M.D.
Peer Review Status: Internally Peer Reviewed
An AP radiograph of the pelvis shows classic
changes of ankylosing spondylitis. Note that the sacroiliac
joints are obliterated bilaterally with osseous fusion. In
addition, there is joint space narrowing of both hips, concentric
in nature, which is similar to rheumatoid arthritis in the
distribution of joint destruction. However, note that there
is extensive sclerosis of both the femur and the acetabulum
as while as large collar osteophytes. This differs significantly
from rheumatoid arthritis. Inflammatory sclerotic changes
of the large bones are common in patients with ankylosing
spondylitis.
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