Gosh, I'm sorry to hear that and that you fractured your knee. I have fallen 2x since my TKR, the last one being last week. I was coming up a flight of steps to my condo with an arm full of groceries and landed square on my knees. There I was, groceries spread all over the landing, my purse in another corner, feeling like a nut case. I just sat for about 5 min. Finally I got up, collected all my stuff and went in. It seems OK, but the very spot it hit on the scar has a blood lister about 1/2" long.
I find that since I had the TKR, I have to be very careful with balance. Stumbling comes very easy ..... I was never like that before.
Take care of yourself and let us know how you're doing.
abby