The other day I fell and landed on my right knee kind of side ways, so on the right side of my knee. About 20 minutes after the fall it started to sting, when I looked at it for the first time there was kind of a scrape to it. Now it s been almost 2 days later and has become numb in the middle of the knee cap, slightly bruised and swollen, it s sore to touch mostly on the right side of my knee and along the side aswell, and there s pain when I first start walking but after awhile it goes away or when I sit or stand there s a slight pain. What is wrong with my knee?