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

Table 1 Baseline characteristics before and after 1:2 matching

Characteristics	Before PSM (n = 248)			After PSM (n = 156)
Characteristics	3D preoperative planning group (n = 196)	Robotics group (n = 52)	P value	3D preoperative planning group (n = 104)	Robotics group (n = 52)	P value
Gender (male/female)	52:144	11:41	0.428^b	23:81	11:41	0.891^b
Side (left/right)	95:101	31:21	0.153^b	61:43	31:21	0.908^b
Age (years)	69.3 ± 8.4	66.1 ± 7.9	0.016^a	66.9 ± 9.4	66.1 ± 7.9	0.585^a
BMI (kg/m²)	25.6 ± 3.2	26.0 ± 4.2	0.472^a	26.0 ± 3.5	26.0 ± 4.2	0.988^a
Pre-HKA (°)	170.6 ± 8.8	172.4 ± 6.4	0.110^a	172.1 ± 9.1	172.4 ± 6.4	0.857^a

PSM, propensity score matching; BMI, body mass index; and HKA, hip–knee–ankle angle
^aStands for t test, and ^bStands for χ² test. P value in bold indicates statistical significance

ISSN: 1749-799X