Observational Study
Copyright ©The Author(s) 2024.
World J Orthop. Mar 18, 2024; 15(3): 247-256
Published online Mar 18, 2024. doi: 10.5312/wjo.v15.i3.247
Table 1 Descriptive statistics of the expected, controlled, and radiographic values from measurements in femur and tibia

The 25th percentile
Median
The 75th percentile
Mean
SD
Femur
Varus
        Expected values0000.20.4
        Controlled values0010.40.6
        Radiographic measures0000.20.4
Flexion
        Expected values6676.20.9
        Controlled values5676.11
        Radiographic measures5665.80.7
Tibia
Varus
        Expected values0000.10.3
        Controlled values0010.30.5
        Radiographic measures00000
Posterior slope
        Expected values5565.41
        Controlled values55.565.70.9
        Radiographic measures5565.40.8
Table 2 Descriptive statistics of the difference of the controlled and radiographic values from the expected values from measurements in femur and tibia

Minimum
25th percentile
Median
75th percentile
Maximum
Femur
Varus (degrees)
        Controlled values-1.00-1.000.000.001.00
        Radiographic measures0.000.000.000.000.00
Flexion (degrees)
        Controlled values-1.000.000.000.001.00
        Radiographic measures-1.000.000.001.001.00
Tibia
Varus (degrees)
        Controlled values-1.00-1.000.000.001.00
        Radiographic measures0.000.000.000.001.00
Posterior slope (degrees)
        Controlled values-2.000.000.000.001.00
        Radiographic measures-1.000.000.000.001.00
Table 3 Concordance correlation coefficient (95%CI) and 95% Limits of agreement of expected values with controlled values and radiographic measurements

Mean (SD)
CCC (95%CI)
95% LOA
Number of differences out of the LOA
Femur
Varus (degrees)
        Controlled values-0.20 (0.61)0.25 (-0.06, 0.56)(-1.40, 1.00)3
        Radiographic measures0.00 (0.00)1.00 (1.00, 1.00)--
Flexion (degrees)
        Controlled values0.03 (0.56)0.83 (0.71, 0.94)(-1.06, 1.10)0
        Radiographic measures0.33 (0.61)0.66 (0.48, 0.84)(-0.86, 1.52)2
Tibia
Varus (degrees)
        Controlled values-0.23 (0.50)0.31 (0.06, 0.56)(-1.22, 0.76)1
        Radiographic measures0.10 (0.31)-(-0.50, 0.70)3
Posterior slope (degrees)
        Controlled values-0.22 (0.63)0.75 (0.59, 0.91)(-1.46, 0.99)3
        Radiographic measures0.03 (0.41)0.89 (0.82, 0.95)(-0.78, 0.84)5