Medical Notes: Face to Pubis delivery : What are the risk factors for it?
Which type of pelvis is associated with an increased incidence of face-to-pubis delivery?
a. Gynecoid pelvis
b. Anthropoid pelvis ✅ (Correct Answer)
c. Android pelvis
d. Platypelloid pelvis
Answer: b. Anthropoid pelvis
Solution:
Face-to-pubis delivery is most commonly associated with the Anthropoid pelvis.
Types of Pelvis:
1. Gynecoid Pelvis
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Normal female pelvis
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Most common type
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Transverse diameter > Anteroposterior (AP) diameter
2. Anthropoid Pelvis
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AP diameter > Transverse diameter
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Face-to-pubis delivery is common
3. Android Pelvis
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Male-type or wedge-shaped pelvis
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All diameters reduced
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Delayed engagement
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Deep transverse arrest
4. Platypelloid Pelvis
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Flat pelvis type
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Transverse diameter > AP diameter
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Least common type
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Shortest diameter of pelvic inlet = Obstetric conjugate
Additional Important Points:
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Most important diameter during labor: Interspinal diameter (of the pelvic outlet)
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Shortest diameter of the fetal skull: Bimastoid diameter
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Largest diameter of the fetal skull: Mento-vertical diameter
