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

Table 2 Comparison of postoperative alignment

	3D preoperative planning group (n = 104)	Robotics group (n = 52)	P value
HKA	179.3° ± 2.5°	181.1° ± 1.6°	< 0.001^a
FFC	90.3° ± 1.9°	89.5° ± 1.5°	0.007^a
FTC	89.5° ± 2.1°	90.0° ± 1.3°	0.077^a
LFC	88.2° ± 2.5°	88.5° ± 2.3°	0.577^a
LTC	86.0° ± 2.7°	86.7° ± 2.3°	0.100^a
HKA absolute deviation	2.0° ± 1.7°	1.7° ± 1.0°	0.150^a
FFC absolute deviation	1.6° ± 1.0°	1.3° ± 0.9°	0.039^a
FTC absolute deviation	1.7° ± 1.3°	1.0° ± 0.7°	< 0.001^a
LFC absolute deviation	2.6° ± 1.7°	2.3° ± 1.6°	0.332^a
LTC absolute deviation	2.2° ± 1.8°	1.9° ± 1.3°	0.163^a
HKA outlier (n, %)	16, 15.4%	1, 1.9%	0.011^b
FFC outlier (n, %)	13, 12.5%	1, 1.9%	0.060^b
FTC outlier (n, %)	14, 13.5%	0, 0%	0.013^b
LFC outlier (n, %)	30, 28.8%	7, 13.5%	0.033^b
LTC outlier (n, %)	28, 26.9%	2, 3.8%	0.001^b

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
^aStands for t test, and ^bStands for χ² test. P value in bold indicates statistical significance

ISSN: 1749-799X