Anatomy of the Bony Pelvis: A Study in Android Structure

1. ANATOMY OF THE
BONY PELVIS: A
STUDY IN ANDROID
STRUCTURE
Lateefa Al Dakhyel FRCSC, FACOG
Assistant professor & consultant
Obstetric & gynecology department
Collage of medicine
King Saud University

2. There are some differences in the structure
of female pelvis in human.
They have significant effects on labor and
difficulty in child-birth.
We shall discuss Caldwell-Moloy
classification of female pelvis and discuss
the causes and effects of the “Android”
pelvic stucture.

3. Pelvic shapes
►Caldwell-Moloy classification
-A line drawn through the greatest diameter of the inlet divides it to ant. &
post.

4. •Gynaecoid pelvis:
1.It is the commonest type (60%)
2.Inlet is slightly oval or round (TD~APD)
3.Sacrum is wide with average concavity and inclination.
4.ischial spines not prominent (transverse diameter is = >10cm)
5.Sacro-sciatic notch is wide.
6. wide pubic arch

5. •Anthropoid pelvis:
1.It makes 30% of white & ~ 50% of nonwhite women.
2.All anteroposterior diameters are more than transverse diameters
(Oval anteroposteriorly)
3.Ischial spines mostly prominent.
4.Sacrum is long and narrow.
5.Sacro-sciatic notch is wide.
6.Subpubic angle is narrow.

6. • Android pelvis :
1.It is~ 12% of white & ~8% 0f nonwhite women.
2.Inlet is triangular or heart-shaped with anterior narrow
apex.
3.Side walls are converging (funnel pelvis) with projecting
ischial spines.
4.Sacro-sciatic notch is narrow.
5.Subpubic angle is narrow <90o.
6.The extreme android pelvis have poor prognosis for
vaginal delivery.

7. •Platypelloid pelvis :
1.It is a flat female type, it is rarest ~3% of women only.
2.All anteroposterior diameters are short.
3.All transverse diameters are long (oval transverse)
4.Sacro-sciatic notch is narrow.
5.Subpubic angle is wide.
6.The sacrum usually is well curved and rotated backward.

8. Clinical estimation of pelvic size

9. Among these pelvic structure:
Gynaecoid structure is most suitable for
vaginal labor
Anthropoid and Platypelloid structures have
lower risks of complexity during labor.
Android structure may cause difficulties
during child birth and often subjected to
prolonged painful labor.
The reason behind the complexity of labor is
Android pelvis has narrower opening at the
bottom to let the baby slide through.

10. Detecting Android Pelvis
You can easily detect a patient’s Android
pelvis from x-raying her waist. You should
find a heart-shape or triangular pelvic cavity
instead of a circle or oval and narrower
bottom towards birth canal.
X-raying pelvic girdle is somewhat risky
and advised to be avoid unless necessary.
You can diagnose android pelvis by
examining the patient’s features.

11. Detecting Android Pelvis (Cont.)
According to Caldwell-Moloy, android pelvis
is a result of lack of secondary sexual
development. Subject should be fully
sexually functional and fertile but she will
show some sign of less feminine attributes.
Detecting android pelvis is necessary for
taking precautions if subject is willing to
give birth vaginally

12. Detecting Android Pelvis (Cont.)
Lower Sex Drive
Subject may or may not have lower attraction for
sexual activity
Less Feminine Body
Subject should have smaller breasts, stronger
body structure and fatty stomach
Harder Vaginal Wall
Subject should have harder and smaller vaginal
interior like teenage girls

13. Causes of Android Pelvis
•There is no definite cause of android pelvic structure.
Some women tend to have this pelvic structure. It is
more common in Asian women
•Android pelvis is a result of lack of changes during
puberty. A woman with android pelvis shows the
physical attributes of teenage girl or premature woman
•It can be a result of premature puberty. Girls who
experience menstrual cycles earlier age can have
android pelvis. It is because their puberty starts before
their body is totally ready for the abrupt changes.
Therefore, their physical changes may remain limited to
the essential changes needed for reproductive functions

14. Android pelvis: Narrow Pelvic
Canal
•The structure of upper pelvis is normal or circular,
therefore no problem during pregnancy. Can bear fully
healthy baby
•The opening of the pelvic canal is narrow. May require
extra effort to give birth causing painful prolonged labor
•Once the head of the baby is out of pelvis and reaches
vagina, the rest is normal. But she has slightly higher
risk to get vaginal walls damaged as her walls have less
elasticity than most other women.

15. Android Pelvis: Lower Sex Drive
•The lack of secondary sexual development which
causes Android pelvis, is also responsible for reduced
sex drive in women
•Subject shows no problem in sexual activities or
enjoying sex, but she may feel less attracted to sex in
normal cases
•Difficult to excite for sex, but once excited she enjoys
the intercourse normally

16. Android Pelvis: Harder Interior of
Vaginal Wall
•During puberty normally vagina goes through a lot of
changes and becomes very soft. According to Caldwell-
Moloy android subject’s vagina does not go through
many of the normal changes and remain harder
•There are both pros and cons of hard vagina. Hard
vagina does not mature and remains like teenage girl’s
for most of the life. Subject remains sexually active up to
older ages than normal as her vagina remains young
•Men like teenage-girl-like vagina because harder vaginal
wall squeezes penis during sex which triggers more
nerve endings. Therefore men feel more pleasure and
stimulation in their penis during coitus

17. Android Pelvis: Harder Interior of
Vaginal Wall (Cont.)
•Although men receive more pleasure, they struggle to
satisfy women with hard vagina. With more stimulation
from rigid vaginal walls men reach orgasm very quickly
and often cannot have coitus for long enough to satisfy
female partner. This may frustrate women and upset
men, as they cannot fulfill their instinct of dominating
their women during sex by satisfying them with
prolonged coitus
•Harder vagina has higher risk of tissue damage during
child birth

18. Android Pelvis: Less Feminine Body
Structure
•According to Caldwell-Moloy, subject having android
•pelvis tends to have less feminine body structure
•Subject with high probability does have smaller breasts,
stronger body structure, fatty stomach, higher RBC and
deeper breath
•Subject may show athletic skills and symptoms of high
blood pressure in later period of life
•Smaller breast is caused by lack of fatty tissue in chest
region, there is enough milk gland to produce enough
milk for baby

19. Android Pelvis: Challenging Sex-life
•Subject shows lower libido. Her partner should be
sensible. She will enjoy sex if initiated with care
•Intercourse may be imbalanced, as her teenage-girl-like
vagina provides supreme pleasure to her man, but due
to this extra sensation her man is more likely to finish
earlier than she needs to be satisfied
•Her partner should learn what makes her happy and
how to please her during coitus and apply those skills
carefully. He must resist his male instinct of rough coitus
to establish domination. In stead he should keep calm
and make love very slowly to fulfill her desire. This may
need some will power but can be achieved by practice

20. Android Pelvis: In Popular Culture
•Most of the sculptures of ancient Greece have body
structures of that of android pelvic women. Greeks did
not care about the satisfying the women and as these
women offered more pleasing coitus for man physically,
they were selected to represent Greek goddesses
•Girls with smaller breasts were called lotus women in
ancient India and were considered to give birth male
children. In India, it was thought that labor pain is harder
for male children. As android pelvic women had often
difficulties during labor, they were supposed to mother
desirable male children. For this reason they were
ranked high in ancient Indian culture

21. Android Pelvis: In Popular Cultures
(Contd.)
•The art and sculptures of ancient Romans feature
women with more feminine structure and Android pelvic
women were categorized as the worst kind. Because
Roman culture shaped the males as warriors and
according to their documents they liked to dominate
their ladies completely. The process of coitus included
torture and punishments with very rough venereal acts.
Women with rigid vaginas were hard to dominate as
intercourse with them does not last longer. Therefore,
they were not liked by Romans

22. Android Pelvis: Further Study
You can read about all four pelvis type and their causes,
effects and consequences in detail in the classification of
female bony pelvis by Caldwell-Moloy
You shall find necessary contents to understand the
structure of bony pelvis, pelvic muscles and ligaments in
detail in Grey’s Anatomy

23. END OF
PRESENTATION
Thank You