Okay, so I'm going to go ahead and place a lot of blame for my knee on work. I had a lovely week or so of vacation, lots of which was spent walking/bouncing around with an extra 13 pounds (in the form of my adorable nephew). My back was sore, my shoulder hurt, my arm muscles were felt, my knee was fine.
I went back to work yesterday and last night/this morning my knee is upset with me. Time to get back to icing on every break, I guess.