a few months ago I stumbled forward and caught myself on a desk. The person sitting at the desk thought I was coming over the desk. My left foot struck a box between myself and the desk. The next 4 days I was hoping my left knee wasn t good. Yeah things got better until I played softball on Saturday June 4th 2016. On June 6th the ache muscles started and my left knee started to swell it look as if fluid is under the skin its very large its hard to walk, get in and out of the car, up & down in the sitting position. By the end of the day I feel like my ankle is a stick hitting the floor. Now I m feeling sharp pains shooting down my upper leg back land front. It s so swollen you can see the difference in size with slack/jeans. You can feel the heat just placing your hand near my left knee and there is a burning sensation on the inner side.