+Thanks for that info. A couple of people have asked me about that. I had a female and we had one leg done but only because she couldn't walk on it. It first started out that it would just pop out once a week or so but it got pretty bad. The other leg seemed fine. When we went to the surgeon he said he could do the other one cuz it "might" go out too, but we thought that you shouldn't fix something that is not broken. So we didn't have the second knee done. It has been 3 years and she shows no sign of any problems with that other knee what so ever. In fact, the knee with the surgery has been just fine too. I wonder how many people chose NOT to do either knee and had their boston "grow" and not need the surgery anymore?