I don't really know a lot about this stuff, or how relates exactly... But.. Be smart, hire a lawyer.
I have a really good buddy who went through disc replacement and shoulder issues at the same time about 5 years ago. He chose to let them buy him out for something like $80,000, if he wouldn't claim the injury again. The injury to his shoulder came back, and it was determined by another doctor it was never repaired correctly - and there was another injury to the shoulder that was in fact diagnosed but never fixed. (I'm not a doctor, how they determine all that I don't know.) He's STILL fighting with the company today, 2 1/2 years after the 2nd surgery to repair the shoulder. He never consulted a lawyer until after the fact, and the lawyer told him unless the number was enough to change your life, he never should have allowed them to buy him out - he's stuck with a pile of doctor bills and the company has tied this thing up now for a long time.