All-metal hip replacements have failed at a high rate and harmed many patients in recent years. Now there is evidence that a major manufacturer was aware of a serious problem with one of its models yet failed to alert patients or doctors and continued to market it aggressively.
The all-metal hips, in which a ball and a cup component are both made of metal, were thought to be superior in some respects to traditional hip replacements made of plastic and metal. Some 500,000 people in this country received all-metal devices over the past decade. They were not adequately tested because of regulatory loopholes the Food and Drug Administration is now moving to close, and began failing not long after implantation.