I had both knees replaced over the last few years. Did the therapy with full range of motion and the pain is almost non-existent compared to what it was. Best move I have ever made. But, that being said, I am still struggling holding up the bike most times. Sometimes things are great but other times the legs feel like wet noodles. Starting a round of new exercises to try and strengthen them further. It took me a full 8 months to ride with my first replacement. About the same for the second one too. Yes, it does chip away at the quality of life but it makes things less painful. Good luck with your recovery.