I had a complete, right knee replacement on Nov 12/2019...yea about 1 month ago. I rode my F6B today for the first time and it feels good, but still a little stiff. I have not tried mounting any of my fire breathing steeds as they require more of a bending of the knee that it can do right now. I am at 99 deg. bending of knee...I working to get 120 deg. bend.