I had stem cells on left knee after TKR proved to be painful and 4 years later I have a swollen painful knee. Opted to go with stem cells on left knee 3 years ago and so far I am active, can garden on left knee, golf, bike but no more tennis. A word to the wise do your homework on who you go with . I went with a doctor trained by regenexx. You can look them up as they are located nationwide.
I do use a stem cell knee brace when I am very active. Downside is the price. Insurance covered everything but the stem cell procedure. That is the mri etc. my cost was $7000. I know the hospital where it was done is now offering the procedure to their employees at low cost. I spent 10 days at home watching tv, reading etc.no hospital stay, no pain pills etc. pain free in 10 days. The stem cells were taken from the hip, mixed with my blood. Run away from doctors who buy stem cells. Use your own. As I said, do your home work. Good luck.