I am a 24(will be 25 in 4 months) year old female. When-ever I was around 13, I crouched down to get some clothes out of our dryer and my knee locked, I thought at first I just needed to pop it but I couldn't force my knee to bend any further and I couldn't stand up. I ended up having to call my uncle to come help me, and eventually it unlocked itself. Well Here in the last 1-1/2, 2 year it has been giving me alot of problems. It stays Swollen, I can't bend it after sitting, It is constantly in severe pain, locks up to where I can only slightly bend it, just gives out while I am walking or standing andis tender to the touch at the vry top. I went to the E.R. once over it, and he said that he thought it was 1 of 2 things, either my knee cap was messed up or down in my knee was, My question is this, what will happen if I don't go to a doctor ( he told me some kind to go to but i forgot, and I currently have no insurance), and does anyone know what it could possibly be and what kind of doctor I need to see?