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Metal ion levels at 5- and 8-year follow-up for stem designs. Values are mean µg/L (95% CI)
| Factor | 5 years | 8 years | |
| Modular | Cobalt | 4.9 (4.1 − 5.7) | 4.8 (4.3 − 5.3) |
| Chromium | 1.8 (1.5 − 2.0) | 1.3 (1.0 − 1.6) | |
| Titanium | 1.3 (1.1 − 1.5) | 1.2 (1.0 − 1.5) | |
| Standard | Cobalt | 1.0 (0.7 − 1.4) | |
| Chromium | 0.9 (0.4 − 1.4) | ||
| Titanium | 0.8 (0.6 − 1.0) |
