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Metal-on-metal total hip replacements (THRs) with large femoral heads have been associated with elevated levels of cobalt (Co) and chromium (Cr), which have been attributed to high levels of wear at the articular surface. Our unit recently published data showing a significant increase in the mean levels of Co ions in patients with a 36-mm diameter femoral head with the metal-on-polyethylene Trident-Accolade system. The aim of this study is to assess the levels of Co and Cr in the Exeter-Trident hybrid system, as similar findings would raise concern over the V40 taper trunnion.

Blood metal ions after hybrid metal-on-polyethylene Exeter−Trident total hip replacement