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Coronal and sagittal component angles were well maintained at the final follow-up.
Average mechanical coronal femoral and tibial component angles were close to those in the preoperative plan.
Figure 1 shows preoperative plans and postoperative CT measurements for all the component angles described above.
We found that our postoperative component alignment angles were close to those planned in the software, although not statistically significantly so for the femoral component angles.
The goal of alignment was to correct the postoperative mechanical axis to within 3° of neutral, and all component angles to within 3 degrees of the ideal.
The ideal mechanical axis was defined as falling within 3° of 180°, the ideal frontal femoral and tibial component angles were within 2° of 90°, and the ideal sagittal tibial angle was within 2° of 85° [ 11, 12, 16].
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Frontal femoral component angle, frontal tibial component angle, hip knee ankle angle, and component slopes were evaluated.
In the sagittal plane, following angles were measured: the sagittal femoral component angle (gamma; Figure 2d) and the sagittal tibial component angle (sigma; Figure 2e) [ 13].
Frontal alignment of femoral and tibial components (FFC: frontal femoral component angle, FTC: frontal tibial component angle) were also measured by full-length radiograph.
The femoral component sagittal alignment and tibial slope (LFC: lateral femoral component angle, LTC: lateral tibial component angle) were measured by lateral radiograph.
– Rotation of the tibial component: angle between the tibial tubercle axis (axis between the geometric center of the proximal tibial plateau and the tip of the tubercle) and the tibial component angle (anterior-posterior line through the tibial component).
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