In this article, a 10 year study showed 18% of people who had a colectomy ended up with a small bowel obstruction due to adhesions:
I recently had a small bowel obstruction caused by adhesions from my colectomy. The surgeon told me that anytime anyone has abdominal surgery, scar tissue can grow beneath the surface and attach itself to organs and cause problems.
There is also the problem of scarring inside the intestines from Crohn's, which can cause a narrowing of the intestine and could eventually lead to a blockage.
I hope that helps answer your questions.
Dx'd Crohn's in '99 at 28. Proctocolectomy and ileostomy in '06.
Small Bowel Obstruction Surgery in '08, caused by adhesions.
Disease-free, medicine-free, and very thankful to be healthy again :)