Pelvimetry of Chinese females with special reference to pelvic type and maternal height

A total of 1619 x-ray pelvimetries were analyzed to establish whether there are any differences in pelvic measurements between the four pelvic types. Of these, 1367 were analyzed to find out the relation between the capacity of each pelvic plane and maternal height. Of the 1619 cases, 564 (34.8%) were gynecoid. 330 (20.4%) anthropoid, 277 (17.1%) android and 448 (27.7%) platypellic. There were considerable differences in pelvic measurements among the four types; android pelves have smaller diameters than gynecoid and anthropoid pelves. These findings suggest that pelvic types classified on the basis of impression alone may have a prognostic significance regarding the course of labor. Maternal height has a positive correlation with pelvic measurements; this correlation is greater at the inlet than at midplane and outlet and is, moreover, more evident in gynecoid and platypellic than in anthropoid and android pelves. If maternal height is less than 150 cm, there is great probability that inlet capacity will be less than average; if it is less than 145 cm. low borderline contraction is highly probable.