What Causes Swelling And Pain On Knees Due To Falling Down?

Hi,

I got off the bike during driving and injured both the knees, right one little more as it developed abrasions and swelling. I had taken the TTS injection and applied Bitadine Gel and powder. In tablets I am taking Ciplox 500mg. Hifnec-P and Rantac. But its being 4 days I am not properly able to bend my knees and walk without pain. Can you please suggest if I need to change my medicine. Swelling has come down but not completely.