Patient specific guides for total knee arthroplasty are ready for primetime

Table 4 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 and the conventional group, n (%)

Outliers	PSG	Conventional	P value
HKA outliers	7 (12.28)	11 (18.33)	0.424
Mean (SD)	179.49 (2.24)	178.54 (2.27)	0.015
FFC outliers	0 (0)	11 (18.33)	0.000
Mean (SD)	89.44 (1.73)	88.03 (1.73)	0.000
FTC outliers	1 (1.75)	0 (0)	1.000
Mean (SD)	89.87 (1.32)	90.37 (1.38)	0.058
LFC outliers	9 (15.78)	35 (58.33)	0.000
Mean (SD)	86.09 (2.86)	86.04 (3.14)	0.314
LTC outliers	9 (15.78)	25 (41.67)	0.033
Mean (SD)	92.86 (2.64)	87.43 (2.63)	0.000

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