Yes had a full replacement about 3 years ago after a rugby injury some years before that.
Main thing is I’m riding roughly what I was riding before; rigid 29er, gravel and road bike on singletrack and road. Longer miles do tend to leave me sore and it takes longer to recover than it used to.
Won’t go into the details but it took me longer to get back and had to have follow-up remedial surgery as the replacement didn’t go so well. Oh and I also crashed the road bike and broke my collar bone and fractured my hip.
Key thing is to get it done and then physio, physio and more physio! Oh yes and I finally got an ebike just before lockdown after hearing how they can help in recovery. It has and more than that has unexpectedly helped me ride my other bikes more.
Its been easy to forget over the last 3 years that before the replacement I couldn’t walk down to the corner shop without it hurting like crap. Embarrassingly I wear a knee pad for every kind of riding but at least I can ride and walk now. Before I could only do one of those things.