The radiological landmarks of the center of the femoral head, the center of
the knee and the center of the ankle joint should all be in line if the
mechanical axis of the femur is correct.
Another method of assessing rotational reduction is to compare the cortical
thickness above and below the fracture. If a shaft fracture is
multifragmentary, the image intensifier cannot be used to compare cortical
diameters on each side of the fracture.