Roentgenographic pelvimetry in single vertex pregnancies

Area of Science:

• Obstetrics and Gynecology
• Radiology
• Maternal-Fetal Medicine

Background:

• Roentgenographic pelvimetry was utilized in 5% of deliveries at The John Hopkins Hospital between 1976-1977.
• A subgroup of 142 single vertex pregnancies underwent radiographic pelvimetry.

Purpose of the Study:

• To evaluate the clinical utility of roentgenographic pelvimetry in predicting delivery outcomes.
• To assess the effectiveness of pelvimetry in managing labor complications and fetal presentations.

Main Methods:

• Retrospective analysis of 142 single vertex pregnancies with radiographic pelvimetry.
• Comparison of cesarean section rates and vaginal delivery success in relation to pelvic size and fetal presentation.

Main Results:

• Cesarean section rate was 40% for adequate pelves selected for imaging.
• Vaginal delivery was achieved in 27% with labor arrest and 22% with floating vertex presentation in small pelves.
• Vaginally delivered infants from small pelves were significantly smaller than those delivered via cesarean section.

Conclusions:

• Roentgenographic pelvimetry demonstrated limited clinical usefulness in managing single pregnancies.
• Pelvic measurements, particularly the AP diameter of the inlet, showed differences between vaginal and cesarean deliveries in small pelves.