Table 4.
Coronal, sagittal, and axial alignment differences
| Variable | Deviation of variable from plan* | p value | Deviation of variable from plan* | p value | ||
|---|---|---|---|---|---|---|
| CT-based patient-specific instrumentation group | Conventional instrumentation group | MRI-based patient-specific instrumentation group | Conventional instrumentation group | |||
| Coronal mechanical limb axis | 3.0° (0°–5°) | 4.5° (0°–8°) | 0.02 | 1.0° (0°–4°) | 4.5° (0°–8°) | < 0.001 |
| Mechanical axis of femur | 1.0° (0°–2.5°) | 2.7° (1°–6°) | < 0.001 | 1.0° (0°–2.5°) | 2.7° (1°–6°) | < 0.001 |
| Mechanical axis of tibia | 1.0° (0°–2°) | 3.0° (1°–6°) | < 0.001 | 1.0° (0°–1.5°) | 3.0° (1°–6°) | < 0.001 |
| Rotational alignment of femur | 1.0° (0°–2°) | 4.0° (1°–7°) | < 0.001 | 1.0° (0°–2°) | 4.0° (1°–7°) | < 0.001 |
| Posterior tibial slope (from 3°) | 1.0° (0°–2°) | 3.5° (1°–7°) | < 0.001 | 1.0° (0°–2°) | 3.5° (1°–7°) | < 0.001 |
* Values are expressed as median, with range in parentheses.