[Obstetrical prognosis by x-ray pelvimetry]

For a period of 44 months 87 deliveries were analyzed by roentgenological pelvimetry, performed by a method, improved by the authors (1982). The relative part of pregnant women with roentgenological pelvimetry was 1.1%. Coefficients of obstetric prognosis were defined in groups retrospectively on the basis of a large material with roentgenological pelvimetry: "compatibility", "conditioned compatibility" and "noncompatibility" as a result of the ratio of the sum of pelvic diameters to the biparietal diameter of the fetus. In the group of "compatibility" of the fetus with the bony pelvis the women, who delivered operatively, had reduced pelvic dimensions with over 0.5 sm in vertex presentations and over 0.3 sm in breech presentations as well as larger weight of the fetus (respectively 4000 and 3500 g). The obstetric prognosis of the groups "compatibility" and "noncompatibility" was exact in 88.9% of the vertex presentations and in 81.5% of the breech presentations.