Table 3.
Whole-blood cobalt and chromium concentrations, values (µg/L) are median (range)
| Preoperative | 6 months | 12 months | 24 months | |||||
|---|---|---|---|---|---|---|---|---|
| R | C | R | C | R | C | R | C | |
| Unilateral implants | ||||||||
| (n=33) | (n=29) | (n=33) | (n=29) | (n=33) | (n=28) | (n=16) | (n=17) | |
| Co | 0.1 (0.1–0.8) | 0.1 (0.1–0.6) | 1.3 (0.1–23) a | 0.85 (0.1–4.0) a | 1.25 (0.6–8.3) | 1.0 (0.1–4.2) | 1.2 (0.5–22) | 0.9 (0.1–2.7) |
| Cr | 0.1 (0.1–1.4) | 0.1 (0.1–0.1) | 1.1 (0.1–15) a | 0.1 (0.1–2.9) a | 1.0 (0.1–6.1) a | 0.5 (0.1–2.0) a | 1.2 (0.1–10) a | 0.5 (0.1–2.1) a |
| Bilateral implants | ||||||||
| (n=5) | (n=4) | (n=5) | (n=4) | (n=5) | (n=4) | (n=3) | (n=4) | |
| Co | 0.3 (0.1–1.1) | 0.1 (0.1–1.8) | 1.7 (1–7.9) | 0.85 (0.5–2.2) | 1.9 (0.9–11) | 1.15 (0.8–1.3) | 2.0 (0.7–6.0) | 1.4 (0.7–1.8) |
| Cr | 0.1 (0.1–0.9) | 0.1 (0.1–0.8) | 1.7 (0.1–3.8) | 0.25 (0.1–1.5) | 2.2 (0.1–4.9) | 0.5 (0.1–0.8) | 1.5 (0.1–2.3) | 0.75 (0.6–0.8) |
a Significant difference between resurfacing (R) and conventional (C) hip arthroplasty (p ≤ 0.05).