I did 10K yesterday under considerable pain from behind my left knee; something is torn there. I didn't respect the pain because It was not caused by running - I got it after running for just 200m from my house on Monday so I was not going to let some random pain stand in the way of my goals.
So I tied a bandage around the knee and hobbled for 25 laps - that took me 54:55 - I had to put speed aside and just get the mileage done. It feels better today and I think it will heal pretty fast since running doesn't seem to exacerbate it. I feel darn tired though; I had little sleep after watching UFC 99 for a good part of the night.