Tell me what you think could be wrong?

I broke my knee two summers ago and had to wear a full leg foam cast. I went to a concert without the cast on and ended up hurting it more so it didnt heal correctly. Sometimes it hurts to walk on and swells up. Yesterday it swelled up and was a bit purple looking. This has been going on for about 4 days. What... show more I broke my knee two summers ago and had to wear a full leg foam cast. I went to a concert without the cast on and ended up hurting it more so it didnt heal correctly. Sometimes it hurts to walk on and swells up. Yesterday it swelled up and was a bit purple looking. This has been going on for about 4 days. What could be wrong with my knee? I'm going to the hospital today to get it checked out
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