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Screw positions in proximal femur. Position 1, central axis of screw is located over center line of femoral head or within distance equal to one-half diameter of screw (ideal position). Position 2, distance between axis of screw and center line of femoral head is between one half and one screw diameter. Position 3, axis of screw is more than one screw diameter from center line. Position is given as two numbers: first for position of screw on anteroposterior radiograph and second for position as seen on lateral view. Ideal position is 1.

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