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Sharp pain at the right of my knee cap when i put any pressure on it? Help?!? - knee cap pins and needles

I slammed my knee on my colleagues, two months ago and since then I had severe pain in his right knee. It is a shock, acute pain, such as pins and needles, and sometimes takes 10 seconds or more. If he lost the feeling in this part of my skin, like when I play the role that I feel nothing, I want to touch a nerve or something. So, if the pressure on the knees and on his knees, that is, if the pain worse. Or when running and sprinting in the sometimes hear a kind of pop Guy then stiff back pain and it hurts after running.
Please help me! :)