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Represents a ratio of the measurements determined from postural radiographs. One (y) beginning from a vertical line originating at the sacral promontory to the intersection with the horizontal line from the anterior-superior position of the pubic bone. The second measurement (x) is along this same horizontal line. Normal values are age-related and increase in subjects with sagittal plane postural decompensation. Pelvic index (PI) equals x/y.
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