Background and purpose—Whole blood (WB) cobalt (Co) and chromium (Cr) ion levels
have a major role in the follow-up of metal-on-metal total hip replacement (MoM THR). We
investigated, first, if there was a change in WB Co or Cr levels over repeated measurements
in patients with ReCap-M2A-Magnum THR, and, second, determined how many patients
had WB Co or Cr levels that exceeded the safe upper limits (SUL) in the repeated whole
blood metal ion assessment. Patients and methods—A Recap-M2A-Magnum THR was used …

Background and purpose—Whole-blood (WB) chromium (Cr) and cobalt (Co)
measurements are vital in the follow-up of metal-on-metal total hip replacement (MoM THR)
patients. We examined whether there is a substantial change in repeated WB, Co, and Cr
levels in patients with bilateral ReCap-M2A-Magnum THR. We also specified the number of
patients exceeding the safe upper limit (SUL) of WB Co and Cr in the repeated
measurement. Patients and methods—We identified 141 patients with bilateral ReCap-M2A …