I am not riding outside these days, although some ice is gone and it's supposed to warm up today. Have been on the trainer, just three weeks out from a little arthroscopic tune-up. Look at some of the crap they took out of my "good" knee. No wonder it was killing me. Keep it smooth out there...
Sorry to hear that is going to be repeated on the "bad" knee. At least you seem to be recovering well enough to sit through a trainer session without complication. Usually that is a good sign of happier years to come.