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

Table 3 Correlation analysis between ΔHKA angle and variables

	r value	P Value^a
ΔHKA angle and Demographic data
Age	0.099	0.233
Sex	0.127	0.125
Body mass index	0.34	< 0.001
Side	0.017	0.841
Affected limb	− 0.077	0.357
ΔHKA angle and Radiographic parameters
Full-length standing radiograph
Hip-knee-ankle angle	0.467	< 0.001
Limb alignment	−0.057	0.055
Medial proximal tibial angle	−0.056	0.5
Lateral distal femoral angle	0.122	0.142
Joint line convergence angle	0.436	< 0.001
Kellgren-Lawrence grade (observer 1)	0.398	< 0.001
Kellgren-Lawrence grade (observer 2)	0.383	< 0.001
Full-length supine radiograph
Hip-knee-ankle angle	0.205	< 0.013
Limb alignment	0.109	0.376
Medial proximal tibial angle	0.102	0.219
Lateral distal femoral angle	0.123	0.137
Joint line convergence angle	0.255	0.002
Kellgren-Lawrence grade (observer 1)	0.373	< 0.001
Kellgren-Lawrence grade (observer 2)	0.372	< 0.001
Knee lateral radiograph
Posterior tibial slope	0.041	0.622

ΔHKA angle, the absolute value of the difference in the hip-knee-ankle angle measured in radiographs taken in the standing and supine status
^a Pearson correlation test was used for continuous variables, and Point-Biserial correlation test was used for categorical variables

ISSN: 1471-2474