I had my knee replaced for the first time almost 5 years ago. Since then I have had 4 revision surgeries. Within a year of every surgery my implant becomes loose and they have to start all over again. After the first revision surgery it was discovered that I am extremely allergic to the main ingredient in bone cement (Polymethyl methacrylate). It is constantly swollen and painful EVERY single day! In five years I have not had 1 pain free day! My last post-op appointment with my surgeon was just a couple of weeks ago and he told me "you might just have to live with it". He said there was nothing more that can be done and pretty much patted me on the back and said "good luck!". Everything that I've read says that you can NOT go from a cemented knee to none cemented knee. I know that it has been done before with success, I just can't seem to find that surgeon who has performed this procedure. If anyone knows or has any info about this I would love to hear about it!