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Related Experiment Videos

Pudendal nerve stretch during vaginal birth: a 3D computer simulation.

Kuo-Cheng Lien1, Daniel M Morgan, John O L Delancey

  • 1Department of Mechanical Engineering, University of Michigan, Ann Arbor 48109-2125, USA. kclien@umich.edu

American Journal of Obstetrics and Gynecology
|May 20, 2005
PubMed
Summary

During vaginal delivery, pudendal nerve branches, particularly those to the anal sphincter, experience significant stretching beyond the threshold for permanent nerve damage. Perineal descent directly impacts this nerve strain.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Obstetrics

Background:

  • The pudendal nerve is crucial for pelvic floor function.
  • Vaginal delivery can subject the pudendal nerve to mechanical stress.
  • Understanding nerve strain during delivery is vital for preventing injury.

Purpose of the Study:

  • To quantify the strain on pudendal nerve branches during simulated vaginal delivery using a 3D model.
  • To assess the impact of perineal descent on nerve strain.

Main Methods:

  • Dissection of pudendal nerve branches in female cadavers.
  • 3D digitization of nerve courses.
  • Importing data into a 3D pelvic floor model.
  • Simulating fetal head descent and calculating nerve strain.

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Main Results:

  • The inferior rectal branch experienced up to 35% strain.
  • The anal sphincter branch reached 33% strain, exceeding the 15% damage threshold.
  • Posterior labia and urethral sphincter branches showed 15% and 13% strain, respectively.
  • Proximal nerve fixation points resulted in greater strain.

Conclusions:

  • Nerves innervating the anal sphincter are stretched beyond the critical damage threshold during vaginal delivery.
  • The extent of perineal descent is a key factor influencing pudendal nerve strain.
  • These findings highlight potential mechanisms for nerve injury during childbirth.