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Updated: Jun 24, 2026

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Electromyometrial Imaging of Uterine Contractions in Pregnant Women

Published on: May 26, 2023

Changes in symphysis pubis width during labor.

Shahnoza Rustamova¹, Mladen Predanic, Melanie Sumersille

¹Department of Obstetrics, Jamaica Hospital Medical Center and the Weill Cornell Medical College, New York, USA.

Journal of Perinatal Medicine

|March 18, 2009

Summary

Labor significantly widens the symphysis pubis (the pelvic joint) in most women. This joint widening varies greatly and is inversely correlated with maternal age in first-time mothers.

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Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse

Published on: April 17, 2019

Area of Science:

Obstetrics and Gynecology
Human Anatomy
Medical Imaging

Background:

The symphysis pubis is a key joint in the female pelvis.
Understanding symphyseal joint dynamics during labor is crucial for assessing pelvic biomechanics.

Purpose of the Study:

To quantify changes in symphysis pubis width during different stages of labor.
To investigate factors influencing symphyseal widening, such as maternal age.

Main Methods:

Serial ultrasound examinations of 32 women during labor.
Measurements of symphysis pubis width at superior and narrowest points during latent, active, and second stages.
Correlation analysis between symphyseal widening and maternal age.

Main Results:

Significant symphysis pubis widening occurred between the first and second stages of labor.
Widening was observed in 94% of women at the superior border and 59% at the narrowest point.
A wide spectrum of widening (9-139%) was recorded; inverse correlation with maternal age noted in nulliparas.

Conclusions:

Labor is associated with substantial symphysis pubis widening in the majority of women.
The degree of symphyseal widening exhibits considerable inter-individual variation.
Maternal age may influence the extent of symphyseal joint laxity during childbirth in nulliparous women.