I took a really bad wipeout when jogging yesterday... Is this a crappy reaosn to miss work today?

I totally messed up my left leg and it hurts terribly... But I am a office worker and don't know if this is a valid reason to miss work. I also messed up my left hand and right leg pretty bad but it is managable... I am just in alot of pain and it is hard to walk. Thoughts?