Fell Hard With All Body Weight Directly On Knee Cap.

Fell hard with all body weight directly on knee cap. Pain shot through my leg and there was a bruise. I can bend and use my leg but my knee cap is extremely tender and when touched with a little pressure there's an extreme burn sensation. When I do bend my knee wired feeling like pulling a rubber band and it feels like there's something moving around in there, jelly like. Please help!