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Updated: Jan 17, 2026

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Risk Factors for and Repair of Obstetric Anal Sphincter Injuries.

W Thomas Gregory1, Alyssa R Hersh, Sara B Cichowski

  • 1Department of Obstetrics & Gynecology, Oregon Health & Science University, Portland, Oregon.

Obstetrics and Gynecology
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Summary

Obstetric anal sphincter injuries (OASIS) affect up to 4% of vaginal births, potentially causing anal incontinence and impacting quality of life. Proper surgical repair and follow-up are crucial for managing OASIS and its long-term effects.

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Area of Science:

  • Obstetrics and Gynecology
  • Surgical Repair
  • Patient Quality of Life

Background:

  • Obstetric anal sphincter injuries (OASIS) occur in up to 4% of vaginal deliveries.
  • These injuries can lead to significant long-term consequences, primarily anal incontinence, drastically affecting a patient's quality of life.

Purpose of the Study:

  • To review the risk factors, repair techniques, and management of obstetric anal sphincter injuries.
  • To discuss the implications for future pregnancies and delivery modes.

Main Methods:

  • Review of risk factors contributing to difficult vaginal birth and operative vaginal delivery.
  • Emphasis on anatomical understanding and layer-by-layer surgical reconstruction for successful repair.
  • Importance of close patient follow-up for early complication detection.

Main Results:

  • Operative vaginal delivery, particularly forceps-assisted, is a key risk factor for OASIS.
  • Successful repair hinges on precise anatomical knowledge and meticulous surgical technique.
  • Post-injury follow-up aids in early identification of complications.

Conclusions:

  • Effective management of OASIS requires understanding risk factors, skilled surgical repair, and diligent follow-up.
  • Future pregnancy discussions must weigh cesarean delivery risks against potential benefits for preventing recurrent injury and incontinence.