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

Appeared in: NCL (MP) Nursing Officer - 2019

Explanation

Obstetroid is not a term used in the Caldwell-Moloy classification of pelvic types.
The four recognized types are Gynecoid, Android, Anthropoid, and Platypelloid.
This classification system is based on the shape of the pelvic inlet, which influences the process of labor and delivery.

Option A: This is incorrect because the Android pelvis, characterized by a heart-shaped inlet, is one of the four main types described by Caldwell and Moloy.
Option B: This is incorrect because the Gynecoid pelvis, with its round inlet, is the most common and classic female pelvic type, considered most favorable for childbirth.
Option D: This is incorrect because the Anthropoid pelvis, featuring an oval-shaped inlet with a long anteroposterior diameter, is another one of the four recognized types.

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 bony pelvis types as background academic context rather than a clinical decision trigger.
Assessing the pelvic type helps the obstetric team anticipate the course of labor, predict potential difficulties (dystocia), and plan for management, including the potential need for operative delivery (forceps, vacuum, or Cesarean section).
For example, a platypelloid pelvis can delay fetal head engagement, requiring specific maternal positioning to facilitate descent.
What if? If a patient has an Android pelvis, the nurse should be extra vigilant for signs of labor arrest, such as failure of the fetal head to descend or rotate, and be prepared to assist with interventions.

How to Approach the Question

First, identify the core subject of the question, which is the classification of female bony pelvis types.
Note the negative keyword 'not'. This means you are looking for the option that does not belong to the group.
Recall the standard classification system for the female pelvis (Caldwell-Moloy).
The four types are Gynecoid, Android, Anthropoid, and Platypelloid.
Compare the options provided against this known classification.
Eliminate the options that are part of the classification (Android, Gynecoid, Anthropoid) to find the one that is not ('Obstetroid').

Concept Tested & Keywords

Concept Tested: Caldwell-Moloy classification of female bony pelvis 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: Question asks for the option that is NOT a described type.

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

E6 Obstetrics Williams p. 16-32

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