Incidence of gynecoid pelvis in females is about?

Appeared in: JIPMER Pondicherry NO - 2022

Explanation

The gynecoid pelvis is the most prevalent type among females, with an incidence of approximately 50%.
It is often referred to as the 'true female pelvis' because its structure is anatomically ideal for childbirth.
Key features include a rounded or slightly oval inlet, straight pelvic sidewalls, and a wide subpubic arch (greater than 90 degrees), which provide ample space for the fetal head to navigate the birth canal.

Option A: This figure is excessively high. No single pelvic type accounts for such a large majority of the female population.
Option B: This is incorrect because it implies that all females have a gynecoid pelvis, which is not true. The Caldwell-Moloy classification identifies four distinct types.
Option C: This value overestimates the prevalence of the gynecoid pelvis. While it is the most common type, it does not occur in 70% of females.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Caldwell-Moloy classification and incidence of female pelvic types as background academic context rather than a clinical decision trigger.
Assessment of the maternal pelvis is a key component of antenatal care and labor management. It helps the nurse or midwife to anticipate the course of labor and identify potential risks for dystocia (difficult labor).
A non-gynecoid pelvis, particularly the android and platypelloid types, is a significant risk factor for cephalopelvic disproportion (CPD), which may necessitate operative vaginal delivery or a Cesarean section.
During labor, slow progress or failure of the fetal head to descend despite adequate contractions should prompt the nurse to consider the possibility of an unfavorable pelvic shape.

How to Approach the Question

Recognize that this is a factual recall question from the subject of Obstetrics and Gynecology.
Identify the core concept: the incidence of the 'gynecoid pelvis'.
Recall the Caldwell-Moloy classification system, which categorizes the female pelvis into four types: Gynecoid, Android, Anthropoid, and Platypelloid.
Remember the approximate prevalence for each type. The gynecoid pelvis is the most common, classic female pelvis.
Recall that the gynecoid type is present in about half, or 50%, of the female population.
Compare this fact with the given options and select the one that matches (50%).

Concept Tested & Keywords

Concept Tested: Caldwell-Moloy classification and incidence of female pelvic types.
Stem keywords: Incidence, gynecoid pelvis, females
Lead-in keywords: about

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

E6 Obstetrics Williams p. 16-33

Practise the full JIPMER Pondicherry NO - 2022

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