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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?

Parameter

MRI 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°)b

7 (19.4%)

8 (22.9%)

0.778

Coronal femoral angle (α)a

94.9° ± 1.1°

94.7° ± 2.0°

0.747

Coronal tibial angle (β)a

90.0° ± 2.0°

90.1° ± 1.5°

0.909

Sagittal femoral angle (γ)a

5.0° ± 2.9°

4.3° ± 2.8°

0.282

Sagittal tibial angle (δ)a

86.2° ± 2.8°

85.6° ± 3.0°

0.420

Femoral external rotation (ER)a to transepicondylar axis

1.2° ± 1.1°

1.1° ± 1.4°

0.810

Femoral ER outlier (> 3°)b

1 (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