Woohoooo!! That is such good news. It is so good to read of success stories. I remember your diary when you had the TKR. So far along now - and those dogs are lovely. Another TKR-er on here does Agility - BubbasMum I think is the name. She posted a video of her in action and like you her doc said it was fine to do, but be careful of cutting movements.
Well done and long may the progress continue. Does it feel like "your" knee now? My Aunt has a TKR and she said it took about 3 years for it to fel like "hers" and in the cold it still feels like a chilly alien! But she doesn't mind as her movement and pain are transformed now too.
Redwing, hope you are also doing well.