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Tens of thousands of metal on metal artificial hips are failing years earlier than expected and are requiring a second surgery to take the old device out and put in a new one. There has been no tracking system to follow how they do, although after the fact a tracking system is being implemented by orthopedists now. This is coming at a price of about $1 billion....

Metal on metal hip prostheses are made of titanium, chromium, and cobalt. When they wear out they release chromium and cobalt into the local tissues, but also into the circulation. Metallosis can result and sometimes leads to tremendous inflammation. The orthopedic community does not yet accept this entity, yet 93,000 DePuy hip prostheses are being recalled....