In March 20, 2008 I fell at work. Hit floor hard, mainly hit R knee hard on floor, all weight went on it. They gave me an X-Ray, Ibuprofen, PT for R knee said it was ok & I was discharged from care & resumed normal work status. I started complaining of pain again shortly after. I had to drag my leg around because it would give out on me while at work. It would swell up. I kept having pain towards the inner part of my knee (where both knees rub onto each other).