I couldn't find this on the internet, but I was told when I got my knees replaced in 2012 and 2013, that my knees where titanium and cobalt. I've heard the price of titanium is about $6000 per ounce. Is there anyway I can get the old knees and sell the titanium from them if they need to be replaced again, which they might be? How do I know how many ounces would be in each knee? I have a feeling I'll have to fight for this to happen, right?