Related Experiment Video
Updated: Mar 19, 2026

Surgical Techniques to Optimize Ovarian Reserve during Laparoscopic Cystectomy for Ovarian Endometrioma
Published on: January 22, 2022
Association between pregnancy and adnexal torsion: A population-based, matched case-control study
Jin-Sung Yuk1, Ji-Yeon Shin, Won I Park
1Department of Obstetrics and Gynaecology, School of Medicine, Eulji University, Daejeon Department of Obstetrics and Gynaecology, MizMedi Hospital, Seoul Department of Preventive Medicine, School of Medicine, Eulji University, Daejeon, Korea Department of Obstetrics and Gynecology, Hankang Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Republic of Korea Department of Obstetrics and Gynecology, Gyeongsang National University Changwon Hospital, Gyeongsang National University, School of Medicine, Changwon, Republic of Korea.
Pregnancy significantly reduces the risk of adnexal torsion (AT), a condition involving ovary twisting. This study found pregnancy to be a negative risk factor for AT, suggesting protective mechanisms at play.
Area of Science:
- Reproductive Medicine
- Gynecologic Surgery
- Epidemiology
Background:
- Adnexal torsion (AT) is a gynecologic emergency.
- The impact of pregnancy on AT risk is not fully understood.
Purpose of the Study:
- To investigate the association between pregnancy and adnexal torsion (AT).
Main Methods:
- Matched case-control study utilizing Korean Health Insurance Review and Assessment Service-National Inpatients Sample (HIRA-NIS) data (2009-2011).
- 545 AT cases were matched 1:4 with 2180 controls based on age and claim year.
- Statistical analysis adjusted for covariates.
Main Results:
- Pregnancy was associated with a significantly lower rate of AT (adjusted odds ratio 0.314, P <0.01).
- Ovarian hyperstimulation syndrome was linked to a higher AT rate (adjusted odds ratio 20.091, P <0.01).
Conclusions:
- Pregnancy acts as a negative risk factor for adnexal torsion.
- Further research is required to understand the underlying mechanisms of this protective effect.
Related Concept Videos
Appendicitis-I: Introduction
Etiology: Appendicitis can arise from various causes, primarily rooted in the obstruction of the appendix lumen. Factors contributing to this obstruction include fecal accumulation, lymphoid hyperplasia and, in...
Ovarian Cycle
Oogenesis
Nondisjunction
Teratogenicity
Torsion of Noncircular Members

