That's wonderful, Ann!!! What an accomplishment. I'm sure the time outside was a huge boost for you.
When you're doing stairs, you are putting your latest TKR leg down first to the lower step and then putting your good leg down on that step with it, right? The little saying we use with steps is:
Down with the bad. Up with the good.
This means you're not actually doing the steps in the normal way, foot over foot. You are taking one step at a time, either facing forward or sideways. When going up you lead with the good leg and when going down you lead with the TKR leg. Doing stairs one step at a time means you never really have to bend your new TKR much at all.
Here's a video that show what my words are trying to explain. You can use this single step method either facing forward like in the video or sideways with both hands firmly on the railing for support.