I suppose improper catheter insertion can cause scar tissue, but I think it must be rare. More of a concern is where the uretha is sewn together after removal of prostate. Sometimes a "stricture" (scar tissue) forms and must be either sounded out or shaved out. I had to have mine sounded (balloned) out. It was not painful because I was put to sleep to have it done. I doubt that havinging scar tissue from catheter is common, although it may be somewhat. Perhaps someone more knowledgeable will respond. Here's praying for a successful surgery.