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Table 3 Postoperative radiographic measurements

From: MRI-based or CT-based patient-specific instrumentation in Total knee Arthroplasty: How do the two systems compare?

ParameterMRI group (N = 36)CT group (N = 35)P Value
Mechanical axis (MA)a−2.1° ± 2.1°−2.1° ± 2.5°0.996
MA outlier (> 3°)b7 (19.4%)8 (22.9%)0.778
Coronal femoral angle (α)a94.9° ± 1.1°94.7° ± 2.0°0.747
Coronal tibial angle (β)a90.0° ± 2.0°90.1° ± 1.5°0.909
Sagittal femoral angle (γ)a5.0° ± 2.9°4.3° ± 2.8°0.282
Sagittal tibial angle (δ)a86.2° ± 2.8°85.6° ± 3.0°0.420
Femoral external rotation (ER)a to transepicondylar axis1.2° ± 1.1°1.1° ± 1.4°0.810
Femoral ER outlier (> 3°)b1 (2.8%)3 (8.6%)0.357
  1. aThe values are given as the mean and the standard deviation
  2. bOutlier values are given as the number of knees, with the percentage in parentheses