I Fell Off My Skateboard And Hit My Knee Pretty

I fell off my skateboard and hit my knee pretty hard it hurt right when I got up and I started limping I can fully walk on it but I can put just a little bit of weight on it. I can't fully bend it, I've tore a ligament on the same knee about 2 years ago and now I don't know if i did the same again. the pain isnt as sever as when I tore it and I can move it more..... Bottom line I don't know if I tore a ligament again or if it's less severe.