@hippiechick the implants used were titanium and Crome. Wearing against each other formed a form of liquid compound that caused the Cobalt / Chromium poisoning. Anyone that has implants should periodically have their blood tested for these two compounds because they can be toxic. Stryker had a class action settlement against them for their failed implants. My wife has followed up with an independent orthopedic surgeon in the event any future complications and hope to never have to go back to Dartmouth out of New Hampshire