My knee is healing slowly, and I'm getting an education in the value of different kinds of training. I still can't quite get into seiza, but I am pleasantly surprised to find that I can get into tatehiza. I've been too a couple of iai seminars in the last few weeks, and I'm learning things about standing etiquette that hadn't really sunk in when I didn't have to use it. Regular practice is good, and it is very interesting having to work out new kinks in seiza kata by doing them standing. So much remains the same, breathing and posture are fundamental and some of the simple benefits I carry with every minute I'm not in the dojo. But the foot work is just a little bit different standing, and that has been a lovely puzzle.
All that said, I really look forward to having a healthy knee again.