If I were you, I would do one knee at a time. Two knees at once is just too much. I know someone who had it done and was in terrible pain. The recuperation for both knees at once was very difficult. I had my right knee done about five years ago. It was a very rough surgery and I was in terrible pain, only being able to take Tylenol due to pain medication allergies. My husband helped me but it was also very hard on him. I have decided to not have my other knee done, although I am in pain with it and it is bone on bone. I just can’t go through it again! If you do one knee, you will have your other knee to help you balance, walk etc. My advice is to take it one at a time. All my best wishes to you. MaryAnn from Boston