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The weight-bearing line (WBL) runs from the femoral head to the ankle (A) and with no angulation, it runs through the center of the knee with a ratio of 50%. Varus alignment gives a smaller ratio found by dividing the horizontal distance from the WBL to the medial border of the tibial plateau (B) by its total width. The mechanical axes of the femur and the tibia intersect at the center of the knee (C) and in the case of varus alignment will create an angle of less than 180º.
