By some estimates, 500,000 patients in the United States have received a type ofartificial hip that is failing prematurely in a number of cases.
The FDA is currently proposing new rules that would prohibit manufacturers from selling these implants.
Under the proposed new rules, manufacturers will have to prove that each device is safe and effective before selling them or before obtaining approval for new all-metal versions.
Under current rules, manufacturers do not need to prove efficacy or put their products through rigorous clinical trials.
The F.D.A. rule proposal is intended to improve the 1976 federal law under which medical devices were first regulated.