You found out just how good the knees have gotten in a few days! Keep up that PT, it I'd have known, if have done 10 times the amount of PT they had me do. And I just had a scope!
My wife’s grandpa had both of his knees replaced and one of them he had to have redone last year. Then he has to have the 2nd one redone as well. It’s rough for him to get around some days.