In following which is the highest number of pelvis?
A. Anterior-posterior
B. Lateral
C. Oblique
D. All are equal
Correct Answer: A. Anterior-posterior
Explanation
Question:
In the following, which pelvis type is found in the highest number?
✅ Answer: Gynecoid pelvis
Explanation
There are four main types of female pelvis:
- Gynecoid pelvis – Most common (≈ 50%)
- Anthropoid pelvis – ≈ 25%
- Android pelvis – ≈ 20%
- Platypelloid pelvis – ≈ 5%
Why Gynecoid pelvis is the highest in number
- It is the typical female pelvis
- Has a rounded pelvic inlet
- Wide transverse diameter
- Well-suited for normal vaginal delivery
- Most frequently seen in women of reproductive age
Summary Table
Pelvis type Frequency Obstetric significance GynecoidHighest (~50%) Best for normal labor Anthropoid Moderate (~25%) Usually adequate Android Less (~20%) May cause difficult labor Platypelloid Least (~5%) High risk of labor problems
Conclusion
👉 Gynecoid pelvis is found in the highest number among women and is the most favorable for childbirth.
Other Options Details
These terms describe the different diameters (measurements) of the pelvis, especially important in obstetrics to assess whether vaginal delivery is possible.
A. Anterior–Posterior (AP) diameter
- Also called the conjugate diameter.
- Measured from the sacral promontory (back) to the pubic symphysis (front).
- It represents the depth of the pelvic inlet.
- Clinically very important because a reduced AP diameter can obstruct labor.
- Average obstetric conjugate: ≈10.5–11 cm.
B. Lateral diameter
- Also called the transverse diameter.
- Measured between the two widest points of the pelvic brim.
- It is usually the widest diameter of the pelvis.
- Average measurement: ≈13–13.5 cm.
- Helps determine how well the fetal head can enter the pelvis.
C. Oblique diameter
- Measured from the sacroiliac joint on one side to the iliopectineal eminence on the opposite side.
- There are two oblique diameters (right and left).
- Average measurement: ≈12–12.5 cm.
- Important because the fetal head often enters the pelvis in an oblique position.
D. All are equal
- ❌ Incorrect option
- These diameters are not equal:
- Transverse (lateral) is usually the largest
- Oblique is intermediate
- Anterior–posterior is the smallest
Summary
Diameter Relative Size Lateral (Transverse) Largest Oblique Medium Anterior–Posterior Smallest
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Writer: Vandita Singh, Lucknow (GS India Nursing Group