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Mechanical axis of the lower limb. Mechanical axis of the lower limb was defined as the acute angle between the mechanical axis of femur and mechanical axis of the tibia. It was expressed as varus aligned, neutral, or valgus aligned. Mechanical axis of the femur was the line joining the center of the femoral head and the center of the knee. Mechanical axis of the tibia was the line joining the center of the knee and the center of the ankle.
