@debbraw : Mostly stuff associated with the kneeling issue. As I mentioned, gardening - like pulling weeds (yuck), carefully planting seeds in a furrow, cutting 100’s of plants back to the ground in the fall, those things are much more strenuous doing bent over now. I can’t really play on the floor with my youngest grandson anymore, not the way he wants to build a fort with pillows and crawl in. I can’t do many yoga positions anymore, especially child’s pose which I used to do to relax my back between plank exercises. I still can’t (don’t dare?) get out of the drivers seat of the car the way I used to - out with left leg, twist right (TKR) leg sideways and slide out. Now I swivel in the seat and put both feet on the ground and stand up. This is no biggie, but it’s a daily reminder I’m not fond of. I feel unsteady or timid climbing ladders, so I’m putting off some chores. Also, I’m trying to find a new way to semi-annually clean my blinds. Used to take them down, put an old towel in the bathtub to avoid scratches, soak them, then - on my knees, of course - wipe down each and every slat individually. No fun!
As far as fun goes, it remains to be seen if I will be ok playing tennis. That would really be disappointing if it turns out to be too difficult or stressful for the knee.
Like you, I walk 5 to 6 mornings a week, but I’m lucky that (age 70) I’m ok with uneven ground. But of course I have one original knee left, which probably helps.