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The antero-posterior inclination of the Frankfort horizontal was investigated in 21 male and 21 female young adult Japanese, holding their heads in the natural head position during horizontal gaze. Horizontal gaze was attained either by simply looking straight forward or by looking at one's own eyes in a vertically placed mirror. This was carried out in sitting and standing positions. For each subject, more than 21 observations were recorded in each of the positions. The distribution of the multiple observations showed no significant departure from normality and the natural head position was found to be reproducible within limits of ±3.4° to ±3.6°. Thus, the validity of the natural head position concept was confirmed.In Japanese, the Frankfort horizontal was found to possess a slight anterosuperior inclination, as opposed to an antero-inferior inclination reported for American and European whites. It is discussed that this difference may amount to 5° to 10°, thus indicating that the Frankfort horizontal does not have the same somatological meaning in Japanese and American or European whites.

An Investigation on the Somatological Significance of the Frankfort Horizontal