Which one of the following is NOT a described type of female bony pelvis?

Appeared in: JIPMER Nursing Officer-2017

Explanation

Obstetroid is not a recognized type in the Caldwell-Moloy classification of the female bony pelvis.
This classification system, crucial for obstetrics, identifies four primary pelvic shapes: Gynecoid, Android, Anthropoid, and Platypelloid.
The term 'Obstetroid' is fictitious in this context and does not describe a pelvic shape.

Option A: The Android pelvis is a recognized type in the Caldwell-Moloy classification. It is characterized by a heart-shaped inlet and is typical of the male pelvis.
Option B: The Gynecoid pelvis is the classic and most common female pelvic type, with a round inlet. It is considered the most favorable for vaginal delivery and is a key part of the classification.
Option D: The Anthropoid pelvis is a recognized type, characterized by a long, oval-shaped inlet (anteroposteriorly). It is the second most common type and often favors an occiput-posterior fetal position during labor.

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 as background academic context rather than a clinical decision trigger.
Understanding pelvic types is crucial in obstetrics for anticipating the course of labor and potential difficulties.
A non-gynecoid pelvis, such as Android or Platypelloid, increases the risk of labor dystocia (difficult labor), cephalopelvic disproportion (CPD), and the need for operative delivery (forceps, vacuum, or cesarean section).
Nurses assess the pelvis during prenatal care and labor to help predict the likelihood of a successful vaginal birth and to prepare for potential interventions.

How to Approach the Question

First, identify the negative keyword 'NOT' in the question stem. This indicates you are looking for the option that does not fit with the others.
Next, recall the standard classification system for female pelvic shapes, which is the Caldwell-Moloy classification.
List the four main types from memory: Gynecoid, Android, Anthropoid, and Platypelloid.
Compare your recalled list to the options provided in the question: Android, Gynecoid, Obstetroid, Anthropoid.
Identify 'Obstetroid' as the term that is not part of the standard classification, making it the correct answer.

Concept Tested & Keywords

Concept Tested: Caldwell-Moloy classification of female pelvic types
Stem keywords: female bony pelvis, type
Lead-in keywords: NOT
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: The question uses negative framing ('NOT') to ask for the option that is an exception.

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E6 Obstetrics Williams p. 16-33

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

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