Factor affecting the discrepancy in the coronal alignment of the lower limb between the standing and supine radiographs

Table 1 Baseline demographic data and radiographic parameters

Variables^a	Overall subjects (n = 147)^b
Demographic data
Age, year	64.6 ± 13.0
Sex
Male/ Female	34/ 113
Body mass index, kg/m²	26.6 ± 4.3
Side
Right/ Left	66/ 81
Affected limb
Yes/ No	91/ 56
Radiographic parameters
Full-length standing radiograph
Hip-knee-ankle angle, °	5.2 ± 4.0
Limb alignment
Varus/ Neutral/ Valgus	118/ 27/ 2
Medial proximal tibial angle, °	86.0 ± 2.1
Lateral distal femoral angle, °	88.1 ± 2.0
Joint line convergence angle, °	3.2 ± 2.4
Kellgren-Lawrence grade
0/ 1/ 2/ 3/ 4 (observer 1)	44/ 37/ 23/ 25/ 18
0/ 1/ 2/ 3/ 4 (observer 2)	30/ 44/ 26/ 20/ 27
Full-length supine radiograph
Hip-knee-ankle angle, °	4.3 ± 3.6
Limb alignment
Varus/ Neutral/ Valgus	107/ 38/ 2
Medial proximal tibial angle, °	85.7 ± 2.3
Lateral distal femoral angle, °	88.3 ± 2.0
Joint line convergence angle, °	1.1 ± 1.9
Kellgren-Lawrence grade
0/ 1/ 2/ 3/ 4 (observer 1)	43/ 40/ 28/ 23/ 13
0/ 1/ 2/ 3/ 4 (observer 2)	31/ 44/ 31/ 18/ 23
Knee lateral radiograph
Posterior tibial slope, °	5.1 ± 2.4

^a The average value of the observers’ measurements was used for continuous variables, and each measurement value of observers was used separately for categorical variables
^b Data are presented as the mean ± standard deviation or number of limbs

ISSN: 1471-2474