Is the Value of Yamamuro Distance "a" and "b" in the Radiogram of the Normal Infant Hip Influenced by the Size of the Pelvis?

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Yamamuro distance "a" and "b" are values which can be easily measured from an X-ray of the hip in infancy. They are often used to show the degree of dislocation in the developmental dysplasia of the hip. Yamamuro reported that in the normal hip, distance "a" was constant at any age before four years of age and distance "b" was the same before one year of age. The purpose of our study was to find whether distance "a" and "b" are influenced by the size of the pelvis.We measured distance "a", "b" and the size of the pelvis in 173 radiographically normal hips before twelve months of age, and evaluated the correlation between both distance "a" and distance "b" with the size of the pelvis.The correlation coefficient of distance "a" and the size of the pelvis was -0.15, showing no correlation. The correlation coefficient of distance "b" and the size of the pelvis was -0.21, again with no correlation. We concluded that distance "a" and "b" in the normal infant hip was not influenced by the size of the pelvis.
西日本整形・災害外科学会の論文