Good day and welcome Kimbocats. You are one of the our silent heros working with kids who need us most.
It sounds as if you are making good progress recovering from knee surgery. Probably you're like me, thinking that I'm a little on the young side for TKR and doing all the "right things," therefore I'd sail right through. Well guess what? Recovery from TKR is not a fitness program, it's a healing program with some stretching and strengthening thrown in to keep things on course.
Probably you will not be able to jump start to intervene on a kid as you have needed to be in the past. More physical demands on your knee will not get you ready for that eitehr. There's a delicate balance between keeping the knee limber/fit, and overdoing it. When we overdo things, we don't move forward faster, and actually can experience setbacks as a result.
So we get to learn (another) lesson in patience. Our knees are boss, and they are not unfit, they are injured from major surgery. Our knees need lots of TLC, rest, icing/elevating, and respect for their individual recovery path.
If you look to the top of this page on the right you'll see a drop down list called "library." In it are a variety of articles covering all the usual topis of TKR recovery including return to work. So have fun reading those, and the posts that will inevitably follow mine. We're here to support you!