Note
So this was a total, total bummer. Went out with the TNT crowd, walked the road, started jogging when we hit the trail, but within a minute or two I could tell my knee (the brace one) just did not feel right. And it didn't get better - which it sometimes does as I warm up. Everyone went on ahead and I walked some and tried to run, but even walking was painful and running was a definite no-no. Limped to the bottom of the usual trail up to home (we had come down a different way intending to run the hillsides and not the drive) and remembered the last time it had hurt this badly running up the hill was fine. So I tried that. Running up was okay - not pain free, but not bad - but the back down was another story. Did that three times - 1:30 up and 3:00 down - but the last down really hurt. So called it a night and just stretched a bit and walked a bit and waited for others to finish.
So I can't think of a single thing that would have made it suddenly hurt like that. It's just totally depressing. Perhaps it was my bold comment that I haven't needed any ibuprofen in a while. ;) For good measure, I took several when I got home and iced for a while and it feels fine now.