Knee problems? (video included)

[muskza]

Hi,

I've been having trouble with my left knee lately and have recently notice that whenever I bend my left knee, my left foot twists outward as can be seen in the following video:

http://www.youtube.com/watch?v=r4yEjhFLVNQ&context=C39ce5daADOEgsToPDskKrPyPtcDbznMLi6E-Xgqzg

Some information that may help includes:
I take no medication.
My high school football season just ended.
I'm 14.
When working out, I've been squatting a lot. (I'm 5"5, 135lbs and lift 205lbs for 4 reps of 6.)
I feel pain whenever extending my left leg fully while laying down.
My left knee feels fine temporarily after running.
I have osgood schlatters in my right knee.

Help's appreciated however, please keep in mind that my family's low on money and I don't have any insurance. I will be happy to provide more information/do different exercises upon request.

Thanks.

- muskz

[Heidi]

When else do you feel pain?
Did the pain just develop gradually or was there a point when it started?