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

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

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