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Pelvimetry independent of external measurements.

“Since the original method of roentgen pelvimetny was recorded in medical literature, obstetricians and radiologists alike appear to have been fascinated with this pnoblem. Apparently the fundamental shortcomings of linear measurements as the solution to problems of disproportion and difficult deliveries were mistaken for inaccuracies, for new methods were constantly revised until the literatune contains several hundred methods or variations of methods of doing the same thing, all with a degree of adcuracy too high to be of practical clinical value.” [1]. We agree with this quotation from the excellent book by the late Paul Bishop. Our initial interest in the problems of pelvimetry was stimulated when fundamental shortcomings were mistaken for inaccuracies by our obstetric colleagues. However, it became obvious that our defenses were on shaky grounds when our reported measurements were found to vary depending on the expertise of the tech nologist who obtained the external measurements. Pelvimetries are frequently obtained at night and may be completed by different technologists on weekdays and weekends. Therefore, we developed a method where all measurements can be determined from the films themselves and not from the technologist’s notations. Another reason for considering modifications of pelvimetry is that our objectives have changed. The advent of technical excellence in diagnostic ultrasound has led to the concept that the only objective of pelvimetny is accurate maternal measurements and an estimate of cephalopelvic disproportion . Ultrasound studies allow such determinations as placental localization, fetal age determination, or abnormalities of presentation with no radiation exposure to the fetus or maternal abdomen.