Hip X-ray on zero magnification. Line AB was drawn by joining the midpoint of two imaginary parallel lines drawn on the shaft. Similarly, line CD was drawn by joining midpoints of two lines pp’ (drawn at and parallel to subcapital region) and line qq’ (drawn at basicervical region and parallel to pp’). Angle formed by intersection of line AB and CD gives the neck shaft angle. The distance between p and q gives length of the femoral neck. Distance ef in AP view plus lateral view gives the tip-apex distance.