OT...Chucker, don't forget catheters have their advantages too. If you can't void laying flat on your back after surgery, you're going to have to stand up, which isn't a pleasant task soon after a TKR. If you still can't do it, the nurse will put a catheter in you with you wide awake and watching. Just hope she's good looking and her nails are not to long. If it's a guy, and he seems to be enjoying his work a little too much, then you're really in trouble!