A simple biplanar method of measuring femoral anteversion and neck-shaft angle.

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A simple biplanar roentgenographic technique for measurement of femoral anteversion and neck-shaft angle is described in which no special equipment is required. An anteroposterior roentgenogram of the pelvis and the femoral neck is made with the hip in neutral rotation. The true lateral roentgenogram is made with the patient's limb in a lateral position with the hip and knee flexed and with the entire lateral aspect of the leg in contact with the top of the table. Projected cervicofemoral angulations are measured on the roentgenograms. The method is described to determine the true angles by dynamically illustrating the projected angles. Graphs have been prepared with which one can readily determine the anteversion and neck-shaft angles once the projected cervicofemoral angulations have been measured.

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