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Table 2 Comparison of postoperative alignment

From: Robotics versus personalized 3D preoperative planning in total knee arthroplasty: a propensity score-matched analysis

  3D preoperative planning group
(n = 104)
Robotics group
(n = 52)
P value
HKA 179.3° ± 2.5° 181.1° ± 1.6° < 0.001a
FFC 90.3° ± 1.9° 89.5° ± 1.5° 0.007a
FTC 89.5° ± 2.1° 90.0° ± 1.3° 0.077a
LFC 88.2° ± 2.5° 88.5° ± 2.3° 0.577a
LTC 86.0° ± 2.7° 86.7° ± 2.3° 0.100a
HKA absolute deviation 2.0° ± 1.7° 1.7° ± 1.0° 0.150a
FFC absolute deviation 1.6° ± 1.0° 1.3° ± 0.9° 0.039a
FTC absolute deviation 1.7° ± 1.3° 1.0° ± 0.7° < 0.001a
LFC absolute deviation 2.6° ± 1.7° 2.3° ± 1.6° 0.332a
LTC absolute deviation 2.2° ± 1.8° 1.9° ± 1.3° 0.163a
HKA outlier (n, %) 16, 15.4% 1, 1.9% 0.011b
FFC outlier (n, %) 13, 12.5% 1, 1.9% 0.060b
FTC outlier (n, %) 14, 13.5% 0, 0% 0.013b
LFC outlier (n, %) 30, 28.8% 7, 13.5% 0.033b
LTC outlier (n, %) 28, 26.9% 2, 3.8% 0.001b
  1. HKA, hip–knee–ankle angle; FFC, frontal femoral component angle; FTC, frontal tibial component angle; LFC, lateral femoral component angle; and LTC, lateral tibial component angle. Values exceeding the target value by 3 degrees were recorded as outliers
  2. aStands for t test, and bStands for χ2 test. P value in bold indicates statistical significance