Table II.
Bone mineral density (BMD) in acetabular zones 1 to 4 and the total contralateral hip at one and two years (CI, confidence interval; MoM, metal-on-metal; MoP, metal-on-polyethylene)
| Mean BMD as percentage of baseline (95% CI) | ||||
|---|---|---|---|---|
| Acetabular zone | MoM | MoP | p-value | |
| Zone 1 | ||||
| One year | 94.4 (90.0 to 98.8) | 99.4 (93.1 to 105.7) | 0.17 | |
| Two year | 97.5 (93.7 to 101.3) | 102.2 (95.6 to 108.8) | 0.19 | |
| p-value | 0.06 | 0.59 | ||
| Zone 2 | ||||
| One year | 94.3 (87.6 to 101.0) | 100.7 (90.9 to 110.5) | 0.26 | |
| Two year | 97.8 (92.4 to 103.2) | 96.1 (87.5 to 104.7) | 0.73 | |
| p-value | 0.21 | 0.19 | ||
| Zone 3 | ||||
| One year | 102.7 (95.9 to 109.5) | 104.4 (97.4 to 111.4) | 0.71 | |
| Two year | 104.8 (97.1 to 112.5) | 107.6 (97.6 to 117.6) | 0.64 | |
| p-value | 0.61 | 0.24 | ||
| Zone 4 | ||||
| One year | 99.1 (94.2 to 104.0) | 99.7 (92.5 to 106.9) | 0.88 | |
| Two year | 100.1 (94.3 to 105.9) | 103.3 (95.9 to 110.7) | 0.49 | |
| p-value | 0.58 | 0.32 | ||
| Contralateral | ||||
| One year | 100.3 (99.3 to 101.3) | 99.1 (97.9 to 100.3) | 0.09 | |
| Two year | 99.8 (98.4 to 101.2) | 98.7 (97.5 to 99.9) | 0.22 | |
| p-value | 0.57 | 0.03 | ||