This is reoccuring pain; it started when I was in fifth grade. Well what happens is, when I get up or step out of a car, etc. my knees just starting hurting like hell and I cant move it for shit. After a few minutes, it's all fine again. Went to the doc; his knowledge is questionable I guess, but told me the pain will go away(something with the tendon, he says is common in teens); I have it until 7th grade. Great, back again 9th grade!! But didnt last as long. Now, it happend again when I was stepping out of my car. If I try to extend my leg it hurts like fuck, but if I keep it bent its ok. Now, about 15-25min later, its getting better(though im scared to move it). Anyone know what the hell this type of injury is???