Wow, you are the Bionic Woman!
From talking to others, I understand the physical therapy and keeping up with the exercises is critical to success.
I know you will keep him on the right path.
My uncle at 83 needed both knees to be replace. They were going to do one at a time. He said “Do them both at the same time! I have places to go!” So they did. He lived to be 92.
Ha! Love your uncle’s courage.