SURGEON MISTAKE

I am 62 years old and i had to go to the hospital for a hip operation. I walked in and because of a mistake made by the surgeon who some how managed to damage a nerve in my leg, I'm now unable to walker without the assistance. I had to sign a form before the operation and now I'm not sure what are my rights. The surgeon said i have to give it 3 months to see if i would feel better but he can't promise me because of the nerve damage. Any advice would be great.