Usefulness of an accelerometer-based navigation system in bilateral one-stage total knee arthroplasty

Table 1 Demographic data and preoperative radiograph of the cBTKA and iBTKA groups

	cBTKA group (N = 57)	iBTKA group (N = 44)	p value
No. of patients	57	44
Age (year)	62.81 ± 7.91	64.89 ± 6.20	0.15
Gender (male/female)	5/52	5/39	0.67
ASA (I/II/III)	5/37/15	0/31/13	0.14
BMI (kg/m²)	26.81 ± 3.84	26.79 ± 4.28	0.98
Preoperative mechanical axis (degree)	5.02 ± 1.09	5.08 ± 0.92	0.66
Anatomical distal femoral angle (degree)	97.43 ± 2.01	97.33 ± 2.89	0.74
Anatomical proximal tibial angle (degree)	83.49 ± 2.55	84.10 ± 3.25	0.69

Data are presented with mean ± standard deviation (SD.) except for No. of patients, gender
For anatomical distal femoral and proximal tibial angle, the angle >90^o was defined as a valgus position, whereas the angle <90^o represented a varus position
ASA American Society of Anesthesiologists (ASA) physical status classification, BMI body mass index, kg/m² kilogram/meter²

ISSN: 1471-2474