Fig. 1.

The method for measuring hip length and hip offset is shown. Point A is the center of the femoral head, point B is the apex of the lesser trochanter, and line Y is the anatomic axis of the femur. Hip offset is measured as follows: Line X is the transteardrop line with line Z drawn through the teardrop perpendicular to the transteardrop line. A perpendicular line between line Y and line Z through the femoral head hip center (point A) is the hip offset, ie, AE plus AF. Hip length is measured from the apex of the lesser trochanter, point B, perpendicular to the transteardrop line X, line BD.