Fig. 2

The distal circle is 5 cm from the distal end of the femoral condyle, and the proximal circle is 5 cm from the distal circle. The line passing through the center of the two circles was considered the long axis of the distal femur. The axis of the lateral femoral condyle of the femur was then determined by drawing a line between the most posterior and most anterior points of the lateral femoral condyle (AP). The distance from the intersection of these two lines to the most inferior point of the lateral femoral condyle defined as the height of the lateral femoral condyle (H). HAPR = H/AP. The proximal circle is 5 cm from the tibial plateau, and the distal circle is 5 cm from the proximal circle. The line passing through the center of the two circles was considered the long axis of the proximal tibia. The post tibial slope (PTS, α) was defined as the angle formed by the axis that passes through the diaphyseal centre and a line parallel to the tibial plateau