pubiotomy

[pyōō′bē-ŏtə-mē]
n.
  1. Surgical severance of the pubic bone a few centimeters lateral to the symphysis, especially to increase the capacity of a contracted pelvis sufficiently to permit the passage of a fetus during childbirth.pelviotomy
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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Historical Examples of pubiotomy