Table 5.

Coronal, sagittal, and axial alignment differences between MRI and CT

Variable	Deviation of variable from plan*		p value
	CT-based patient-specific instrumentation group	MRI-based patient-specific instrumentation group
Long-leg mechanical axis	3.0° (0°–5°)	1.0° (0°–4°)	0.03
Mechanical axis of femur	1.0° (0°–2.5°)	1.0° (0°–2.5°)	0.18
Mechanical axis of tibia	1.0° (0°–2°)	1.0° (0°–1.5°)	0.45
Rotational alignment of femur	1.0° (0°–2°)	1.0° (0°–2°)	0.56
Posterior tibial slope (from 3°)	1.0° (0°–2°)	1.0° (0°–2°)	0.60

* Values are expressed as median, with range in parentheses.