Radiological parameters. (A) The weight-bearing line (WBL) was defined as the line drawn from the center of the femoral head to the center of the superior articular surface of the talus. The WBL ratio was defined as the tibial insertion of the weight-bearing line/tibial width, with the medial tibial edge at 0% and the lateral tibial edge at 100%. (B) The mechanical lateral distal femoral angle (LDFA) was defined as the angle between the femoral mechanical axis and the articular surface of the distal femur (yellow line). The medial proximal tibial angle (MPTA) was defined as the angle between the tibial mechanical axis and the articular surface of the proximal tibia (white line). (C) The joint line convergence angle (JLCA) was defined as the angle of the two articular surface lines of the distal femur and the proximal tibia.