Had my yearly appointment with stem cell Dr. He said if i do yearly PRP i will never have to undergo TKR. I can golf, garden on one knee, bike etc. Not having to suffer through another TKr is great in my mind. Spending out of pocket was a choice that i made and as i look back, was a wise choice. I read every day those who suffer with their TKR. So yes, i did not take government money to do another TKR but i take no pain pills etc. I do have constant pain from my TKR but i try to ignore it, ice and elevate it. Enough said. By the way, the surgeons in my area also say stem cells do not work. I did read that Ohio State hospitals have new procedures for the knee. One is they insert the cartiledge through an incision in the knee, the other is a meniscus replacement . Both without major surgery. Watched their news clip. Might be something to investigate .