In reply to anon127:
> ...I'm currently unable to straighten or bend my leg fully
I had this after completing an ultra marathon about 3 weeks ago. The pain lasted about 10 days, and my doc gave me something to bring the swelling down but didn't actually diagnose anything useful.
I tried a run last Wednesday as the pain had gone away and movement returned, but after about a km I was getting pain again which gradually got worse.
At least I've finished my running objectives for the year, but desperately want to get out again. I'm gathering mine was more of a 'runners knee' injury through overuse, but I'm getting the feeling that resting is just fixing the symptoms and not the cause. Time to find a local sports physio I guess.