The most common type of pelvis in females is:

Appeared in: AIIMS BHOPAL NO- 2018( Shift-2nd)

Explanation

The Gynaecoid pelvis is the most prevalent type in females, occurring in approximately 50% of women.
It is considered the classic 'female' pelvis and is the most favorable for vaginal childbirth.
Key features include a rounded or slightly oval inlet, straight pelvic sidewalls, and a wide subpubic arch (around 90 degrees), providing ample space for the fetal head.

Option A: This is the least common type, found in only about 5% of women. It is a flat pelvis with a wide transverse diameter but a short anteroposterior diameter, which is unfavorable for vaginal delivery.
Option B: This type is found in about 25% of women. It has a long anteroposterior diameter. While it often allows for vaginal delivery, it is not the most common overall type.
Option C: This is the typical 'male' pelvis, found in about 20% of women. It has a heart-shaped or triangular inlet and a narrow subpubic arch, which can lead to difficult labor (dystocia).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Caldwell-Moloy classification of female pelvic types and their prevalence as background academic context rather than a clinical decision trigger.
Understanding pelvic types is crucial for nurses and midwives to anticipate potential labor difficulties. A non-gynaecoid pelvis can increase the risk of cephalopelvic disproportion (CPD), labor dystocia, and the need for operative delivery.
During labor, assessing the progress of fetal descent and rotation provides clues about the pelvic architecture and its adequacy for vaginal birth.
What if? If a woman is known to have an Android or Platypelloid pelvis, the nurse should be prepared for a potentially longer labor, monitor for signs of fetal distress and lack of progress, and anticipate a higher likelihood of requiring a cesarean section.

How to Approach the Question

This is a factual recall question from obstetrics.
Identify the core concept: types of female pelves and their frequency.
Recall the Caldwell-Moloy classification, which categorizes pelves into four main types.
Remember the approximate prevalence of each type: Gynaecoid (approximately 50%), Anthropoid (approximately 25%), Android (approximately 20%), and Platypelloid (approximately 5%).
Select the option with the highest prevalence, which is Gynaecoid.

Concept Tested & Keywords

Concept Tested: Caldwell-Moloy classification of female pelvic types and their prevalence.
Stem keywords: most common, type of pelvis, females
Lead-in keywords: most common

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E6 Obstetrics Williams p. 16-33

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 38-46

Practise the full AIIMS BHOPAL NO- 2018( Shift-2nd)

Attempt every question from this paper in a timed mock, then review the full solution for each one.