I had a hip replacement that was recalled due to possible leaching of chromium and cobalt. The surgeon had those metals tested with a blood test every year after that. The levels went up very slowly for a few years. Then year 6 after surgery they doubled. They still were not at dangerous levels, but normal levels in blood are almost zero, so I had my hip redone. Those levels returned to almost zero the next time tested. The second surgery did not have to cut into the femur so it was not as extensive. Good luck.