Hi. A week ago during my frisbee practice, I jumped to try to catch a frisbee and dove onto the ground landing on my knees first. Immediately after that I felt immense pain. During the week, everytime I touched the spot I landed on, I would feel a lot of pain. Around the lower right part of my knee, if I were to scratch it, I feels numb, as if it was an after effect of anesthetics used to cause numbness for pulling out your teeth. (I kind of not feel anything) Any idea what has happened?