It would be interesting to know who is in change of gathering national statistics and how that is done. In my case, I had a standing one year, and a five year return appointment with my surgeon to check on my right TKR. As I understand, they will contact me again at 10 years -- if I am still around! X-rays are taken as well as an oral interview, so I am assuming that is for their records and statistics to track patient success rates. I know four other people besides myself, who had TKR's all of us had good results, I don't personally know anyone who had a bad result. But from reading here, I know there are those who for varying reasons have problems.