Hi Thanks for your query There hasn t been much research done on the long-term effects of these hips on either the tissues around the hip or on tissues elsewhere in the body. There are concerns regarding the high levels of heavy metals (cobalt and chromium) in the blood; however, there are very few reports of actual clinical problems. If the blood test indicates a high level of these particles, a second blood test may be done at three months .These levels may be high even if you are not experiencing any symptoms, so this blood testing is very important. If the second blood test still indicates a high level of these particles, you may require ultrasound test of your metal on metal Hip System. If such tests show a reaction to the particles, you may require surgery to replace your implant. Having said that my advice would be visit the operating surgeon and discuss the above said issues. Take care and wish you good health Regards Dr.chugh http://bit.ly/drmchugh