Metal-on-metal hip replacements have failure rates two to three times the rate of non-metal devices. In addition, they release toxic metal ions, according to a warning released by the FDA updated in January, 2013. The warning did not include testing for toxic metals. But a simple challenge test using EDTA can test for these metals, and chelation therapy can remove them from the body, hopefully before significant damage is done. Patients with metal hips should see a doctor knowledgeable in chelation therapy as soon as possible.
See the web sites of the FDA, icimed.com, and acam.org.