Ankylosing spondylitis can involve peripheral joints as well as the spine and SIJ. The hip is the most common peripheral joint involved. We discuss this in more detail at this link http://bit.ly/ankylosingspondylitiship
4. There is ankylosis of both SIJ's and the lower
lumbar spine in keeping with Ankylosing
Spondylitis.
In this context, bilateral loss of joint space at the
hip joints indicates a peripheral arthritis related
to the Ankylosing Spondylitis.
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