This is my experience with pill cams...I had one and it got caught. It caught where I had previous surgery and my small intestine was narrow. Was in for 5 days!! I was shceduled to have surgery to get it out and ... then, it came out ..whew!
My GI always goes on and on about pill cams being the only true way to see inside the area they need to. I was scheduled for another one not to long ago ...however, Dr. said that he was going to "place" it down in the small intestines when I was out for and endoscopy. He thought that it would keep it from getting caught...who knows? They were going to do both at the same time. a 2fer! But, needless to say I didn't get it done because I ended up in E.R. with another issue..anyways, it's pretty painless and it does work if it doesn't get stuck!
you can't have UC in the small bowel. UC by definition is confined to the colon.
The pill cam is a very good diagnostic tool, but it will onyl show Crohns ulceration and inflammaytion in the small intestine if you have it there. You note that scope and biopsies previously confirmed Crohns . . . so the pill cam would mostly be used to show extent of disease (or not) in the GI tract above where the colonoscopy can reach.