Before revision: diameter, the maximal opening in the bony pelvis (pelvic outlet), then there is no reason to perform an episiotomy, asan episiotomy will not increase the diameter of the opening of the birth canal any further i.e.
After revision: diameter, the maximal opening in the bony pelvis (pelvic outlet), then there is no reason to perform an episiotomy, as an episiotomy will not increase the diameter of the opening of the birth canal any further i.e.