I'm really not finding anything on this, but I have been having this real dull achy pain in the back of my knee for several days - Actually, it is something I have had on and off for quite some time. It gets worse when I sit (like the blood flow is being cut off to my knee) - especially driving. I was clearing mountain bike trails on Sunday and it got really bad after that and now I am having a hard time sitting for any time at work. It doesn't seem to get worse when I cycle and it does seem to get better when I stretch - But for some reason, it doesn't feel like a muscle pull to me.

Any ideas? I'm debating on whether to call my doctor, but I hate taking the time out of my day to sit in a doctor's office.......