Some percentage of people with UC do develop spondyloarthropathy. There are two schools of thought, one of which is that it is a sign of poorly controlled UC, the other that it's severity is independent of how your UC is doing at any given time. My guess is both of those are true, depending on the person.
If you didn't have UC, the first line of treatment would be NSAIDs. But since NSAIDs are not recommended for people with UC, the recommended treatment is TNF blockers. Unlike UC, it is not considered to be a condition that goes into remission. It can be more or less severe, but is always there unless medicated.
Like you, I have had mild to moderate colitis, with flares every 3 years or so. And yet, I have quite bad spondyloarthropathy. I have not yet started TNF blockers, and had instead hoped that diet mod might help it. It has helped some (and has helped a lot with residual UC symptoms that I had notwithstanding being in remission) but I don't think it has helped enough.
Post Edited (FSLondon) : 9/22/2015 6:08:25 AM (GMT-6)