Hi,
It appears that all the spondyA's can turn ankylosing, and the diagnosis is made often from history or slight radiological patterns hence in europe the increasing use of SpA axial or peripheral......and the relaxed criteria comapred to those used for AS as an effort to pick it up ealier and as recognsition that the non ankylsoing conditions are also quite a handful.
One thing I did notice whilst learning was that PsA can be pretty savage for some! (sorry got a face flare can't see properly)
David
