After an estimated 500,000 patients in the United States have received a type of artificial hip that is failing early in many cases, the Food and Drug Administration is proposing rules that could stop manufacturers from selling such implants.
Under the proposal, which the agency is expected to announce on Thursday, makers of artificial hips with all-metal components would have to prove the devices were safe and effective before they could continue selling existing ones or obtain approval for new all-metal designs.
