Fig 1.
Method for obtaining long-leg weight-bearing anteroposterior radiographs.
Imaging: Fourth lumbar vertebrae to the lower end of the calcaneus; Middle point of imaging: Patella.
Fig 2.
a. Femoral Angle. Lateral angle of intersection of the two straight lines of the femoral and tibial diaphysis. The midpoints of the transverse diameters of the femur and tibia were 10 cm from the center of the epiphyses of the femur and tibia. b. Tibial Calcaneal Angle. The angle between the tibial axis and the line tangent to the line perpendicular to the tibial axis was the angle between the calcaneal contour contact point and the straight line connecting the center of the tibial canal. Line A: Tibial anatomical axis; Line B: Perpendicular to the tibial axis; Line C: Tibial canal center—calcaneal contour contact point. c. Tibial Anterior Surface Angle. The medial angle between the tibial axis and tibial canopy in the frontal view of the talofemoral joint. d. Tibial Plafonds and Talar Domes on Weight Bearing. The angle between the tibiotalar and talar glenoid planes.
Table 1.
Baseline characteristics of the patient and control groups.
Table 2.
Measurement of the four angles and grade progression in the Kellgren–Lawrence classification.
Fig 3.
Significant difference in the angles between each Kellgren–Lawrence classification.
(a) Femorotibial angle (p < 0.05); (b) tibial calcaneal angle (p < 0.05); (c) tibial anterior surface angle (p = 0.94); (d) talar dome during weight-bearing (p = 0.17).
Table 3.
Measurement of grade progression in Kellgren–Lawrence classification and T Takakura–Tanaka classifications.