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a Lateral X-rays of axis vertebra demonstrates points. See Table 1 for abbreviations; b lateral X-rays of axis vertebra demonstrates ABC angle = screw angle; c lateral X-rays of axis vertebra demonstrates G the inner diameter of the odontoid; H the outer diameter of the odontoid. d Sagittal computerized tomography reconstruction demonstrating the inner diameter of the odontoid and the outer diameter of the odontoid
