Fig. 2

a Measurements of the alpha angle taken in computed tomography (CT)-angiogram reformatted images. In the coronal plane a line was drawn from the entry point (E) to the high medial point (M). The angle between this line and the line along the long axis of femur was termed the alpha 1 angle. Another line was drawn in the coronal section from the entry point (E) to the adductor hiatus (AH). The angle between this line and the line along the long axis of the femur was termed the alpha 2 angle. b Measurements of the beta angle taken in CT-angiogram reformatted images. Beta angle: in the sagittal plane a line was drawn from the E to the M. The angle between this line and the line along the long axis of the femur was termed the beta 1 angle. Another line was drawn from E to AH. The angle between this line and the long axis of the femur was termed the beta 2 angle