Figure 1.

Three-dimensional models of the entire femur and its canal. The centerline of the medullary canal was established, and the isthmic diameter was then calculated as 7.20 mm (a). A circle was fitted into the centerline of the medullary canal, and a torus was then created using the fitted circle and isthmic diameter (b). The banking angle was defined as the angle between the RFC plane, in which the fitted circle was located, and the coronal plane, on which the femoral model was placed; this angle was measured at 64.16 degrees.