Some. They don't cause issues as long as my pouch is happy but I think it causes blockages when I have any inflammation or irritation in my pouch. My other GI couldn't figure out why I was complaining that I literally couldn't empty my pouch when I had a flare up and required prednisone. I think the prolapses cause some sort of feedback loop where a food/illness bothers me and makes me go to the bathroom more/strain some, which causes the prolapse to get inflamed, which causes me to strain more, and on and on until I ended up with a fistula and sometimes bad enough inflammation to require prednisone.
Dr Shen seems to think I have prolapses not Crohns in my pouch that caused the fistula and the pouch inflammation. It explains my lack of symptoms for years and the fact that the rest of my intestines always look really good. That said Remicade works on me too but I want the fistula gone and I would love to not take any medication again!!!