You know when it's time to have your knee done. I've had one done and have another to do,though it's not ready yet. It is a painful surgery but if you go in knowing that you have to move that knee , exercise as soon as possible. take the meds they give you so you can exercise you should do fine. I was riding the bike the first week because I was determined to get back on my feet. I walked into rehab 1 week after the surgery 4 weeks ahead of everyone else.
I will keep you in my prayers. Mia