Pelvic girdle: adaptation for childbirth & clinical Flashcards Preview

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Flashcards in Pelvic girdle: adaptation for childbirth & clinical Deck (26)
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what do the majority of women have? (type of pelvis)

The majority of women have a gynaecoid pelvis


which type of pelvis do male have?

android pelvis


what is main difference between gynaecoid pelvis (F) and android pelvis (male)?

The slight differences in their structures creates a greater pelvic outlet, adapted to aid the process of childbirth


structure of gynaecoid pelvis?

A wider and broader structure, lighter in weight


shape of pelvic inlet of gynaecoid pelvis?



shape of pelvic inlet of android pelvis?



significance of ischial spine in gynaecoid pelvis?

Less prominent ischial spines, allowing for a greater bispinous diameter


sub-pubic arch in gynaecoid pelvis?

A greater angled sub-pubic arch, more than 80-90 degrees


significance of sacrum in gynaecoid pelvis (compared to android pelvis)?

A sacrum which is shorter, more curved and with a less pronounced sacral promontory


other features of gynaecoid pelvis adapted for childbirth aside from bony adaptations?

the sacrotuberous and sacrospinous ligaments can stretch under the influence of progesterone and increase the size of the pelvic outlet further


what does the foetus pass through during childbirth?

The lesser pelvis is the bony canal through which the foetus has to pass during childbirth


what requires to be measured to determine the childbearing capacity of the mother

determine the diameter of the lesser pelvis (bony canal) - the childbearing capacity of the mother


how can the diameter of the lesser pelvis (bony canal) be determined?

The diameter can be determined by a pelvic examination or radiographically


which 2 measurements are of significance when determining the diameter of the lesser pelvis (bony canal)?

Obstetric Conjugate
Diagonal Conjugate


what is significant about obstetric conjugate in childbirth?

used to determine the narrowest fixed distance that the foetus would have to negotiate


how do you measure for the obstetric conjugate?

the minimum antero-posterior diameter of the pelvic inlet is measured


which distance is the obstetric conjugate?

This distance is between the sacral promontory and the midpoint of the pubic symphysis (where the pubic bone is thickest) and is known as the obstetric conjugate (or true conjugate)


can the obstetric conjugate be measured? why?

However, this measurement cannot be taken clinically, due to the presence of the bladder


what is the diagonal conjugate?

the alternative, measuring from the inferior border of the pubic symphysis to the sacral promontory


how can the diagonal conjugate be measured?

can be measured manually via the vagina


how do you measure the diagonal conjugate?

To do this you use the tip of your middle finger to measure the sacral promontory and then using the other hand to mark the level of the inferior margin of the pubic symphysis on the examining hand. You then use the distance between the index finger and the pubic symphysis to measure the obstetric conjugate


what is the ideal measurement of the diagonal conjugate?

ideally 11cm or greater


in addition to measuring the diagonal conjugate, what is carried out?

a mid-pelvis check is carried out


how do you carry out a mid-pelvis check?

the clinician is testing for straight side walls and measuring the bispinous diameter


what is the narrowest part of the pelvic canal?

mid-pelvis check:
bispinous diameter


how can the width of the subpubic angle at the pelvic outlet be determined?

by the distance between the ischial tuberosities