Types of Pelvic and Their Effect on Birth

Subject: Midwifery I (Theory)

Overview

The three most common pelvic forms are gynaecoid, plastyelloid, and anthropoid. Gynaecoid pelvis, which affects 50% of women, is the most common kind of pelvis. It is additionally known as the real female pelvis. One-third of white women and one-sixth of non-white women have android pelvis, a typical male pelvic feature that affects 20% of the population. 25% of women are anthropoid, which has an oval brim and a somewhat smaller pelvic cavity. An exit is quite large, despite the possibility of lowering some of the other dimensions. A kidney-shaped brim and 3-5 percent of cases have a platypelloid pelvis. The anteroposterior (front to back) dimension of the pelvic cavity is generally modest and narrow. Although the head often passes into the hollow with ease, it is engaged in the transverse diameter.

Gynaecoid Pelvis

  • The most typical kind of pelvis 50% of females have learned.
  • Seen as a sincere woman.
  • The inlet is oblong and somewhat rounded.
  • a big pelvic cavity and a sidewall of the pelvis that is straight.
  • Sacral curvature is good.
  • The ischium lacks discernible spines.
  • There is a wide pubic arch.
  • Obtuse greater sciatic notch
  • Both the bi-tuberous diameter and the subpubic arc are normal.
  • For obstetric outlets, it is advantageous.
  • It occurs more frequently in women with average height and build who wear shoes size 4 or larger..

Android Pelvis

  • One-third of white women and one-sixth of non-white women have a typical male pelvis.
  • A little over 20% of the time.
  • Pelvic brim with a heart shape.
  • Pelvic funnel from the top to the bottom.
  • There is a little pubic arch.
  • The ischial spine is clearly visible.
  • This type of pelvis makes childbirth challenging and increases the risk of perineal tears.
  • The cavity's funneling could slow down the labor process.
  • Biparietal diameter, which causes the head to tilt backward, is intolerable to it.

Platypelloid Pelvis

  • Present in 3-5% of instances.
  • A kidney-shaped brim.
  • Ischial spine has a rounded shape.
  • Anteroposterior (front to back) measurements of the pelvic cavity are normally shallow and occasionally narrow.
  • Very slight sacral curvature.
  • There is frequently cephalo-pelvic disproportion as a result.
  • Although the head typically slides through the hollow with ease, it is engaged in the transverse diameter.
  • In order for the biparietal diameter to pass through the brim's narrowest anterior-posterior diameter, engagement may require lateral head tilting, also referred to as asynclitism.

Anthropoid

  • 25 percent of females have it.
  • The pelvic cavity is fairly small, and the brim is elliptical.
  • Despite the enormous output, some of the other diameters may be reduced.
  • This form of pelvis is frequently found in tall women with narrow shoulders.
  • Although direct occipital anterior or direct occiput posterior is frequent, and the position chosen for the engagement may last until delivery, labor is typically uncomplicated.

References

  • Chaudhari B.D., 1996, Handbook of General anatomy, 3rd edition CBS Publisher and distributors
  • Chaudhari B.D., 1998, Human Anatomy (Vol. 1, 2, 3), 3rd edition CBS Publisher and distributors
  • Pathak T., 2057, A handbook of Anatomy and Physiology, 3rd edition, Vidhyarthi Pustak Bhandar, Bhotahiti, Kathmandu
  • Tuitui R. 2002, A textbook of Midwifery A (Antenatal), 3rd edition, Vidyarthi Pustak Bhandari (Publisher and Distributor), Bhotahity, Kathmandu
  • Tuitui R., Suwal, S.N. 2001, Human anatomy and physiology, first edition, Makalu Books and stationers, Putalisadak, Kathmandu
  • Tuladhar K., Shrestha U., Henk C., 1992, Integrated science, First Edition, HLMC
Things to remember
  • The most common types of pelvic structure are gynaecoid, android, plastyelloid, and anthropoid. Gynaecoid pelvis, which affects 50% of women, is the most common kind of pelvis. It is additionally known as the real female pelvis. It would work well as an obstetric outlet. Women of average height and build who wear a shoe size 4 or larger are more likely to experience it.
  • One-third of white women and one-sixth of non-white women have android pelvis, a typical male pelvic feature that affects 20% of the population. This kind of pelvis makes childbirth challenging and increases the risk of a perineal tear.
  • 25% of women are anthropoid, which has an oval brim and a slightly smaller pelvic cavity. An exit is quite large, despite the possibility of lowering some of the other dimensions.
  • In 3-5% of cases, the pelvis is platy-pelloid, and the brim is kidney-shaped.
  • The anteroposterior (front to back) dimension of the pelvic cavity is typically small and narrow.
  • Although the head typically slides through the hollow with ease, it is engaged in the transverse diameter.
Videos for Types of Pelvic and Their Effect on Birth
Female Bony Pelvis Types - In relation to CHILDBEARING
Questions and Answers

Different pelvic types and how they affect birth:

  • Gynaecoid pelvis:

    • Most typical pelvic type 50% of women discovered
    • A real feminine pelvis is one that
    • Rounded: Intake is slightly oval.
    • Has a spacious pelvic cavity and a straight side wall.
    • Good sacral curve
    • Ischial spines are barely noticeable.
    • Wide pubic arc
    • Greater sciatic notch, obtuse
    • Bituberous diameter is normal, and the sub-pubic arc is 90 degrees.
    • It benefits obstetric outlets.
    • It affects females of average height and build who wear shoes that are at least a size four.

  • Android pelvis:

    • 33% of white women and 16% of non-white women have the typical male pelvis.
    • Present in 20% of cases
    • Heart-shaped pelvic brim
    • Pelvic funnel descending from above
    • Slender pubic arch
    • An imposing ischial spine
    • The baby is difficult to deliver in this type of pelvis, and perineal tears are more common.
    • Flowing in a cavity could impede labor progress.
    • Because of its inability to accept biparietal diameter, the head is forced rearward.

  • Platypelloid pelvis:

    • Existing in 3-5%
    • Brim with a kidney shape
    • Sharp Ischial spine
    • Typically shallow, the pelvic cavity can also be small from the front to the back.
    • somewhat curved sacrum
    • Frequently, it causes cephalo-pelvic disproportion.
    • The head engaged in transverse diameter but often easily descended into cavity
    • To allow the biparietal diameter to pass the narrowest anterior-posterior diameter of the brim, engagement may require lateral head tilting, or asynclitism.

  • Anthropoid:

    • Available in 25% of women
    • Its pelvic chamber is fairly narrow and has an oval brim.
    • Although some of the other dimensions may be smaller, the outlet is huge.
    • This form of pelvis makes women more likely to be tall and have narrow shoulders.
    • A direct occpito anterior or direct occpito posterior is frequently a feature of labor, and the position chosen for the engagement may last until delivery.

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