Patient specific guides for total knee arthroplasty are ready for primetime

Table 5 Mean (SD) values and amount of patients and percentages of outliers of > 3˚ deviation of the planned alignment and postoperative alignment compared between the patient specific matched guides groups, n (%)

	Trumatch	Visionaire	PSI	Signature	P value
HKA outliers	3 (20.00)	1 (7.69)	2 (14.28)	1 (6.66)	0.819
Mean (SD)	178.5 (2.3)	181.3 (1.6)	180.6 (1.6)	177.9 (1.8)	0.000
FFC outliers	0	0	0	0	1.000
Mean (SD)	89.9 (1.6)	90.1 (1.5)	89.9 (1.2)	87.9 (1.8)	0.000
FTC outliers	0	0	1 (7.14)	0	1.000
Mean (SD)	89.3 (1.4)	90.0 (1.2)	89.9 (1.6)	90.6 (1.3)	0.081
LFC outliers	2 (13.33)	2 (15.38)	1 (7.14)	4 (26.66)	0.663
Mean (SD)	85.7 (1.6)	85.4 (2.1)	87.4 (1.9)	85.8 (4.5)	0.307
LTC outliers	2 (13.33)	4 (30.76)	2 (14.28)	1 (6.66)	0.594
Mean (SD)	92.7 (2.4)	91.2 (3.0)	94.8 (1.2)	92.8 (2.7)	0.000

PSI: Patient-specific instrument; HKA: Hip-knee-ankle angle; FFC: Frontal femoral component; FTC: Frontal tibial component; LFC: Flexion/extension of the femur component; LTC: Lateral tibial component.