I have AS...or Reactive arthritis....or undifferentiated spondylorthropy....take your pick, it doesn't really matter how we label it, it is still whatever everyone on here has. mine is mainly in my hands and feet. when I had my first serious flare, the google detective in me decided I must have gout. I was wrong. If I remember correctly you can test for uric acid in the urine to rule out gout.
But AS can most definately attack hands and feet. the knuckle at the base of my middle finger in my right hand, and the corresponding joint in my right foot are the constant problems for me. other areas come and go. At times the hand or foot was bad enough to incapacitate me, amd other times, it barely affects me. No or Low starch diet helps, as does minocycline in pulsed dosing and zyflamend is helpful (an herbal anti-inflammatory mix).
Hope you get to the bottom of yours soon....god luck