Metal ion levels tested at long-term follow-up
| Metal ion | Study cohort (n = 71 patients)* | p value | ||
|---|---|---|---|---|
| Mean ± SD | Range | 95% CI | ||
| Chromium, unilateral, μg/L (ppm) | 2.62 ± 2.7 | 0.66–16.69 | 1.90 to 3.32 | 0.85 |
| Male | 2.42 ± 2.5 | 0.66–16.69 | 1.67 to 3.17 | |
| Female | 3.12 ± 3.2 | 0.88–10.43 | 1.36 to 4.88 | |
| Cobalt, unilateral, μg/L (ppm) | 3.12 ± 6.4 | 0.58–43.71 | 1.39 to 4.73 | 0.21 |
| Male | 2.47 ± 3.4 | 0.58–21.6 | 1.47 to 3.48 | |
| Female | 4.89 ± 11.7 | 0.91–43.65 | −1.4 to 311.25 | |
| Chromium, bilateral, μg/L (ppm) | 1.83 ± 0.7 | 1.24–4.72 | 1.64 to 2.12 | 0.76 |
| Male | 2.48 ± 0.9 | 1.24–4.72 | 1.93 to 3.03 | |
| Femal | 2.32 ± 0.8 | 1.64–3.49 | 1.58 to 3.05 | |
| Cobalt, bilateral, μg/L (ppm) | 2.78 ± 1.0 | 1.06–3.75 | 2.28 to 3.33 | 0.64 |
| Male | 2.08 ± 0.8 | 1.06–3.75 | 1.59 to 2.55 | |
| Female | 1.88 ± 0.3 | 1.52–2.23 | 1.62 to 2.18 | |
BHR = Birmingham Hip Resurfacing; CI = confidence interval; SD = standard deviation.
↵* Unilateral BHR, n = 56; bilateral BHR, n = 15.