Clinical value of CT-based patient-specific 3D preoperative design combined with conventional instruments in primary total knee arthroplasty: a propensity score-matched analysis

Table 3 Comparison of postoperative component position and lower limb alignment

	Conventional group (n = 109)	Novel technique group (n = 109)	P
LTC mean ± SD	9.48° ± 3.74°	4.23° ± 2.57°	< 0.001^b
LTC percentage of outliers > 3°	95.05%	31.68%	< 0.001^a
FTC mean ± SD	89.77° ± 2.11°	89.58° ± 2.00°	0.496^a
FTC percentage of outliers > 3°	13.86%	14.85%	0.842^a
LFC mean ± SD	88.31° ± 3.01°	88.51° ± 2.81°	0.615^b
LFC percentage of outliers > 3°	33.66%	32.67%	0.883^a
FFC mean ± SD	90.01° ± 2.46°	90.05° ± 1.95°	0.903^b
FFC percentage of outliers > 3°	18.81%	14.85%	0.455^a
HKA mean ± SD	− 0.16° ± 3.80°	− 0.46° ± 2.63°	0.557^b
HKA percentage of outliers > 3°	40.37%	17.43%	< 0.001^a
HKA percentage of overcorrection	26.61%	11.01%	0.003^a

The target value of LTC is 3°, the target values of FFC, FTC, and LFC are 90°, and the target value of HKA is 0°
LTC lateral tibial component angle, FTC frontal tibial component angle, LFC lateral femoral component angle, FFC frontal femoral component angle, HKA hip-knee-ankle angle.
^aStands for chi-squared test
^bStands for t test

ISSN: 1749-799X