Metal on Metal Hip Bearings

Metal on metal hip bearings have been associated with very low rates of wear and are commonly used in North America and Europe. Patients with these bearings have higher levels of metal ions, particularly cobalt and chromium in the bloodstream than patients with bearings made of other materials. There's been no evidence that patients with metal on metal bearings are developing sarcomas or carcinomas with higher frequency than the general population. However, there has been mixed data as to whether hematopoietic malignancies are slightly more prevalent in patients withmetal on metal bearings.