Concentrations of Co in µg/L for several interventions in RCTs.

THA = Total hip arthroplasty; HRA = Hip resurfacing arthroplasty.SH = Small head; LH = Large head; IQR = Interquartil range.Hint:.Values of the given studies were reported, if they fitted to the fixeds timeframes; if several measurements fitted to one timeframe, those values were reported.being nearest to the timeframes given above; e. g. values were reported 3 months and 5 months postoperative > values 5 months postoperatively are shown in this table.*Median, n.**Mean, n.***Mean, range, n.****Median, range, n.2metal ion measurement mean 6.8 years postoperatively.3metal ion measurement mean 3.2 years postoperatively.4metal ion measurement median 24.3 months postoperatively.5metal ion measurement mean 67 months postoperatively.6metal ion measurement mean 121 months postoperatively.