Uterine Contractility and Endometriosis

Altered uterine contractility bridges endometriosis, infertility, and reproductive physiology.

Key Points

Highlights:

• Uterine contractility is a dynamic, cycle-dependent physiological process with key roles in sperm transport, implantation, and menstruation.
• Dysregulated uterine peristalsis is increasingly linked to endometriosis, infertility, and reproductive dysfunction.

Importance:

• Understanding uterine contractility shifts endometriosis from a lesion-centered model toward a functional and systems-level disorder.
• Contractility patterns may represent a missing link between normal physiology and disease development.

What's Done Here?

• This is a  narrative review synthesizing current evidence on uterine contractility across the menstrual cycle.
• Study integrates imaging (ultrasound, MRI), physiological studies, and clinical observations.
• It also explores associations between altered contractility, infertility, and endometriosis.

Key Findings:

• Uterine peristalsis varies across the menstrual cycle, with hormonally regulated direction and intensity.
• Dysregulated uterine peristalsis may alter menstrual reflux dynamics and promote ectopic implantation.
• Abnormal peristaltic patterns are observed in patients with endometriosis and infertility.
• Imaging techniques allow in vivo assessment of uterine contractility, though standardization remains limited.
• Dysregulated uterine peristalsis represents a pathophysiological shift that may alter menstrual reflux dynamics and contribute to ectopic implantation.

Strengths and Limitations:

• Strengths are: integrative synthesis of physiology, imaging, and clinical data; conceptual framework linking uterine function to endometriosis and infertility.
• Limitations are: narrative (non-systematic) design; heterogeneity in measurement techniques; limited standardization and lack of prospective validation of contractility-based biomarkers.

From the Editor-in-Chief – EndoNews

"This review revisits a fundamental yet underappreciated aspect of human reproduction: uterine contractility. Traditionally regarded as secondary, uterine peristalsis is now understood as a tightly regulated, cycle-dependent process with direct implications for fertility and disease.

Positioning this phenomenon within a physiology–pathophysiology continuum, the authors link normal reproductive dynamics to disease development. By integrating imaging, experimental, and clinical data, they redefine uterine activity as a functional interface between normal biology and pathological states such as endometriosis. This perspective challenges the prevailing lesion-centered paradigm and introduces a systems-level framework for understanding disease.

Dysregulated contractile patterns may alter menstrual reflux dynamics and thereby contribute to ectopic implantation. At the same time, heterogeneity in measurement techniques and the absence of standardized assessment limit the translation of these observations into clinical practice.

Importantly, this work underscores that reproductive disorders cannot be fully explained by static anatomical findings alone. Dynamic uterine activity likely plays a role not only in symptom generation but also in disease progression.

Future progress will depend on standardized imaging protocols, quantitative assessment tools, and meaningful correlation with clinical outcomes. Such integration may enable the transition from descriptive observation to clinically actionable biomarkers.

The emerging message is clear: uterine contractility is not peripheral, but a central determinant of reproductive health—and, when dysregulated, of disease."

Lay Summary

Uterine contractility—the rhythmic movement of the uterus—is increasingly recognized as a key physiological process that extends beyond menstruation to influence fertility and reproductive health.

A recent review from Dr. Nicoli, from Bari, Italy, highlights how these coordinated contractions, which vary across the menstrual cycle, play essential roles in sperm transport, embryo implantation, and menstrual flow.

Importantly, emerging evidence suggests that altered uterine contractility may contribute to the development of endometriosis.

Abnormal peristaltic activity may reflect an underlying pathophysiological process that alters menstrual reflux and enables the spread of endometrial cells beyond the uterine cavity.

Advances in imaging techniques, including ultrasound and magnetic resonance imaging, now allow in vivo assessment of uterine contractility, although standardization remains limited.

The authors emphasize that integrating contractility patterns into clinical evaluation may improve understanding of infertility and endometriosis.

Published in Reproductive Medicine Online, this review proposes that uterine contractility should be considered not merely a physiological phenomenon, but a potential diagnostic and mechanistic axis in reproductive medicine.

Research Source: https://pubmed.ncbi.nlm.nih.gov/41687169/