Enough about the knee, already!

My knee was much better this morning (of course), but I did go to see the doctor.  He said there was some fluid in the knee and that perhaps the patella had slipped while I was asleep (since the onset was so sudden), and it had gradually worked back into place.  Sounds reasonable, especially since it seems to be okay now.  He encouraged me to do some specific exercises to strengthen muscles in the area.  I'm mostly back to "normal" today, but I will use a cane for a while longer.