Repeated cobalt and chromium ion measurements in patients with bilateral large-diameter head metal-on-metal ReCap-M2A-Magnum total hip replacement

Figures & data

Figure 1. Geometric mean whole blood Co values (left) and Cr levels (right) divided across the follow-up time before initial measurement.

Figure 2. Changes in Cobalt (Co) and Chromium (Cr) ion levels compared to initial measurement

Figure 3. Spagetti plots for Co and Cr values at initial and control measurements. Values are naturally log-transformed.

Differences in WB Co and Cr levels (ppb)

	Initial	Control	p-value
WB Co, n = 61
geometric mean	2.8	2.2	< 0.007
median (range)	2.7 (0.60–25)	2.1 (0.50–21)
WB Cr, n = 61
geometric mean	2.8	2.3
median (range)	2.6 (0.80–14)	2.1 (0.50–18)	< 0.001

There was a statistically significant decrease in repeated WB Co and Cr ion values.