special tests for ankylosing spondylosis

please any one can suggest me whether any special tests are there to do on ankylosing spondylosis patient?

thanks

Have a look over this article Ankylosing Spondylitis

There is one test witch is not mention in that article witch could confirm or exclude sacroileitis, it’s called Menell catch: patient lie prone and you with one hand put sacrum fixed on bed and with other get the patient bent knee(90 degree) and lift leg of the bed. If the Menell is positive, patient feels pain in sacroiliac joint. It is the earliest sign of ancylosing spondylitis.

Please also have a look over that information resource

Using Published Evidence to Guide the Examination of the
Sacroiliac Joint Region