I read that, like knee replacement, Iovera has an 80/20 percent success rate. My pain doc (who I have told I am NOT doing TKR because of all the horrible stories I read, and was going to do Iovera, but now scared of that, too!) says that only those (or at least the majority) go on websites to complain when things go wrong, versus, when things go right...I'm trying very hard to believe that! But I am still putting off the TKR surgery until I am at a point where I just can't even walk! How sad is that!