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The global FO was measured by addition of the distance between the longitudinal axis of the femur and the center of the femoral head (A1) and the distance from the center of the femoral head to a perpendicular line passing through the medial edge of the ipsilateral teardrop point of the pelvis (B1). The measurement was repeated bilaterally to compare the global FO of the operated side (A1 + B1) to that of the unoperated hip (A + B).
