I hit my knee yesterday on a pole that was about the height of my knee while my top half went a little forward. It hurt pretty bad but I could still ride my bike home. Now/the day after my knee has a mild pain in the front when I extend it as far as possible and the back of my knee hurts when I walk. I was wondering if I did any serious damage. It doesn't hurt bad or even at all when I am just standing or sitting.