Table 7 Whole blood metal ion results
From: Metal-on-metal hip resurfacing in patients younger than 50 years: a retrospective analysis
Under 50 case study | ||||||||
|---|---|---|---|---|---|---|---|---|
Variables | Group 1 (under 50) | Group 2 (over 50) | p values between group 1 and group 2 | |||||
Unilateral (N = 494) | Bilateral (N = 331) | p value | Unilateral (N = 836) | Bilateral (N = 559) | p value | Unilateral 1 vs. 2 | Bilateral 1 vs. 2 | |
Co (μg/L) | 1.1 ± 0.83 | 1.8 ± 1.25 | <0.0001* | 1.1 ± 0.93 | 1.9 ± 1.31 | <0.0001* | 1.000 | 0.2633 |
Cr (μg/L) | 0.9 ± 0.84 | 1.6 ± 1.32 | <0.0001* | 1.0 ± 0.93 | 1.5 ± 1.32 | <0.0001* | 0.0498* | 0.2750 |
Follow-up date (years) | 4.4 ± 2.58 | 4.9 ± 2.75 | 0.0080* | 3.9 ± 2.38 | 4.4 ± 2.55 | 0.0002* | 0.0003* | 0.0062* |
No. (%) of patients tested | 825 (64%) | – | 1359 (70%) | – | 0.0108* | |||
No. (%) of levels converted | 117 (24%) | 72 (22%) | 0.5157 | 191 (23%) | 138 (25%) | 0.4295 | 0.7279 | 0.3173 |
Normal, no. (%) | 393 (80%) | 169 (51%) | <0.0001* | 657 (79%) | 234 (42%) | <0.0001* | 0.6745 | 0.0078* |
Optimal, no. (%) | 488 (99%) | 320 (97%) | 0.0366* | 815 (97%) | 533 (95%) | 0.0300* | 0.1052 | 0.3371 |
Acceptable, no. (%) | 6 (1.2%) | 11 (3.3%) | 0.0366* | 21 (2.5%) | 26 (4.7%) | 0.0300* | 0.1052 | 0.3371 |
Problematic, no. (%) | 0 (0%) | 0 (0%) | 1.000 | 0 (0%) | 0 (0%) | 1.000 | 1.000 | 1.000 |
Potentially toxic, no. (%) | 0 (0%) | 0 (0%) | 1.000 | 0 (0%) | 0 (0%) | 1.000 | 1.000 | 1.000 |