How difficult is it to hold hospital responsible?

I was rear ended in October which resulted in knee swelling. X-rays indicated nothing, then discovery of blood clots. In next 2 weeks had 2 aspirations but could not get enough to figure out why I was in so much pain. Went to ER, third aspiration taken and was admitted because INR was 6. We were told the sample had grown staph but was such a small sample couldn''t be sure it was caused from cross contamination. Discharged after 5 days with prescriptions of Oxycodon, Dalaudid. Contacted the orthopedic surgeon for appointment, when he read the lab report arranged surgery next day as it was life threatening. Day after surgery Infectious disease doctor visited, he indicated it had always been staph. Went home with a PICC line and pump so I could get dose every 3 hours for 1 month. I started PT 3 weeks ago and was not gaining any motion. I got a second opinion about plan of action and was just informed I will never be able to run, ski, bike because of the damage from staph.