If you have pouchitis, joint pain can be associated with it. In my case, my enteropathic arthrtitis was an autoimmune disease that was related to my UC, but with an independent course. I probably had it going on before my colectomy, but was on such a high dose of steroids, it was masked. Once I was weaned off of the prednisone after my j-pouch surgery, I had a lot of pain, so much that they thought maybe I had avascular necrosis. A bone scan showed inflammation in both SI joints, my knee, and shoulders. Ten years later it got much worse. THEN I went on biologics! So, you see, in my case for sure, not related to the biologics. They were the treatment, not the cause.
I had bouts of various tendinopathies decades before my colectomy, but always assumed they were something else. Turns out they were all related.
Jan