I took a fall down a couple of steps.  My ankle gave out and so I went down awkward on my other foot which caused pain to my left knee (that later went away).  Later when I stood, there was pain in the left lower side of my back.   The pain is increased when I stand or sit in a not good position.  Any advice?
Hi there. Firstly I would like you to get an X-ray done of the injured part. Get it evaluated by an orthopedic. In the meantime start this treatment