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ABNORMALITIES OF BONY PELVIS

Derived from latin word means BasinRing of bone:Two hip boneSacro-coccygeal part of vertebral columnThe pubic part of hip bone connected by pubic Symphysis.Pelvic bone is made up of various sections:For obstetrical

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Слайд 1ABNORMALITIES OF BONY PELVIS
TEACHER NAME: IRINA KAMILOVA
STUDENT NAME: SACHIN PANDEY
GROUP

NO. 163-B- LA-1

ABNORMALITIES OF BONY PELVISTEACHER NAME: IRINA KAMILOVASTUDENT NAME: SACHIN PANDEYGROUP NO. 163-B- LA-1

Слайд 2Derived from latin word means Basin

Ring of bone:
Two hip bone
Sacro-coccygeal

part of vertebral column

The pubic part of hip bone connected

by pubic Symphysis.


Pelvic bone is made up of various sections:

For obstetrical purposes, the pelvis is divided by the pelvic brim into two parts:
The False Pelvis
The True Pelvis

Introduction

Derived from latin word means BasinRing of bone:Two hip boneSacro-coccygeal part of vertebral columnThe pubic part of

Слайд 3The False Pelvis is that portion above the pelvic brim.

It does not take part in the mechanism of delivery

and is of no obstetric interest.

Intercristal diameter [IC ~29 cm]: widest point on lateral aspect of iliac crest

Interspinous diameter [IS ~26 cm]: distance between the lateral tips of the anterior superior iliac spines

External conjugate [AP] diameter [EC ~20 cm]: distance between apex of spine of 5th lumbar vertebra and centre of the superior border of symphysis pubis.

False Pelvis

The False Pelvis is that portion above the pelvic brim. It does not take part in the

Слайд 5The True Pelvis is that portion below the pelvic brim.

It determines the size and shape of the birth canal.
Pelvic

Brim or Pelvic inlet: formed by the upper margins of pubic bones, the ilio-pectineal lines and the anterior upper margin of the sacrum.

Cavity: formed by the pubic bones, ischium, ilium, and sacrum

Outlet: diamond-shaped made up of the pubic bones, ischium, ischial tuberosities, sacrotuberous ligament, and 5th segment of sacrum

True Pelvis

The True Pelvis is that portion below the pelvic brim. It determines the size and shape of

Слайд 6Pelvic inlet
Pelvic inlet is formed from behind forward by

Sacral promontory

Anterior

margins of ala of the sacrum

Linea terminalis

Upper end of symphysis

pubis.
Pelvic inletPelvic inlet is formed from behind forward bySacral promontoryAnterior margins of ala of the sacrumLinea terminalisUpper

Слайд 8A-P diameter or anatomical conjugate Extends from middle of sacral

promontory To the upper margin of symphysis pubis.

Oblique diameter:
Sacroiliac joint

of one side to the iliopubic Eminence of other side.

Transverse diameter:
Widest of all the diameters.

Pelvic inlet

A-P diameter or anatomical conjugate Extends from middle of sacral promontory To the upper margin of symphysis

Слайд 10Pelvic cavity
Extends downwards and backwards from pelvic inlet,intervenes between inlet

and outlet.

Posterior wall of the cavity longer than anterior wall.
Boundaries

Anteriorly
By symphysis pubis and body of the
pubis with its rami

Posteriorly
Concave pelvic surface of sacrum and
coccyx.

On each side
Quadrangular area formed by pelvic surface of ilium and ischium.
Pelvic cavityExtends downwards and backwards from pelvic inlet,intervenes between inlet and outlet.Posterior wall of the cavity longer

Слайд 11Pelvic cavity
Anterior posterior diameter:
From middle of the back of symphysis

pubis to the pelvic surface of third sacral vertebrae.

Oblique diameter:
Lower

end of sacroiliac joint to the centre of
obturator membrane.

Transverse diameter:
Across the lateral bony walls of pelvic cavity.
Pelvic cavityAnterior posterior diameter:From middle of the back of symphysis pubis to the pelvic surface of third

Слайд 12.
Pelvic outlet

It is diamond shaped and wider in female.
Boundaries In

front
Lower margin of symphysis pubis
connected by arcuate pubic ligament

Behind
Tip of

the coccyx

Anterolaterally
Conjoint ischiopubic rami.

Laterally
Ischial tuberosities.

Posterolaterally
The sacrotuberous ligament.
.Pelvic outletIt is diamond shaped and wider in female.Boundaries In frontLower margin of symphysis pubisconnected by arcuate

Слайд 13Pelvic outlet ( inferior view )

Pelvic outlet ( inferior view )

Слайд 14Pelvic outlet
Anterior –posterior diameter:
from lower border of symphysis pubis to

tip of the coccyx.

Oblique diameter:
Between the junction of ischio-pubic ramus

of one side and middle of the sacrotuberous ligament of the opposite side.

Transverse diameter:
between the medial surfaces of the lower ends of ischial tuberosities.
Pelvic outletAnterior –posterior diameter:from lower border of symphysis pubis to tip of the coccyx.Oblique diameter:Between the junction

Слайд 16Types of pelvises
Gynaecoid
Anthrapoid
Android
Platypelloid

Types of pelvisesGynaecoidAnthrapoidAndroidPlatypelloid

Слайд 17Gynaecoid pelvis
Ideal pelvis favouring a normal delivery;
50.6% of women

Brim slightly

ovaltransversely but almost Rounded.

Sacrum curved Ischial spines not prominent

Short-cone pelvis

Obtuse

greater sciatic notch

Triangular obturator foramen

Sub-pubic arch rounded [Roman arch] angle at least 900
Gynaecoid pelvisIdeal pelvis favouring a normal delivery;50.6% of womenBrim slightly ovaltransversely but almost Rounded.Sacrum curved Ischial spines

Слайд 18Male-type pelvis favouring OP positions and apt to cause deep

transverse arrest of head; 22.4% of women.
Brim heart-shaped Sacrum curved
Ischial

spines prominent Long-cone funnel pelvis Acute greater sciatic notch Oval obturator foramen

Sub-pubic arch very narrow [Gothic arch]

Android pelvis

Male-type pelvis favouring OP positions and apt to cause deep transverse arrest of head; 22.4% of women.Brim

Слайд 19Ape-like pelvis favouring OP positions often requiring operative vaginal deliveries;

22.7% of women.


Brim AP oval
Sacrum very slightly curved Ischial spines

prominent

Long-cone funnel pelvis with straight sidewalls

Obtuse greater sciatic notch

Oval obturator foramen
Sub-pubic arch narrow

Anthrapoid pelvis

Ape-like pelvis favouring OP positions often requiring operative vaginal deliveries; 22.7% of women.Brim AP ovalSacrum very slightly

Слайд 20Platypelloid pelvis
Leads to cephalo-pelvic disproportion; 4.4% of women.
Brim oval transversely

Sacrum very slightly curved Ischial spines prominent Short-cone shallow pelvis

Acute greater sciatic notch Triangular obturator foramen Wide arch narrow
Platypelloid pelvisLeads to cephalo-pelvic disproportion; 4.4% of women.Brim oval transversely Sacrum very slightly curved Ischial spines prominent

Слайд 21Asymmetrical pelvises

Asymmetrical pelvises

Слайд 23Clinical Assessment Body build

Clinical Assessment Body build

Слайд 24Engagement defined as the point when the engaging diameter [BPD(biparietal

diameter = ~10 cm] goes past the pelvic brim.
Five fingers

= 10 cm.

Fifths palpable above symphysis pubis

Clinical Assessment foetal head as pelvimeter

Engagement defined as the point when the engaging diameter [BPD(biparietal diameter = ~10 cm] goes past the

Слайд 25In Gynaecoid & Android pelvis distance between ischial spine to

brim is ~5 cm.

In Anthropoid pelvis distance is ~7 cm

In

Platypelloid pelvis distance is ~3
cm


Station of the head in
relation to ischial spines

Clinical Assessment foetal head as pelvimeter

In Gynaecoid & Android pelvis distance between ischial spine to brim is ~5 cm.In Anthropoid pelvis distance

Слайд 26vaginal examination

vaginal examination

Слайд 27Clinical Assessment vaginal examination

Clinical Assessment vaginal examination

Слайд 28vaginal examination

vaginal examination

Слайд 29Presentation of the fetus at the time of delivery

Presentation of the fetus at the time of delivery

Слайд 30Clinical Assessment radiological examination
True AP Conjugate
Obstetric Conjugate
Mid-cavity AP Conjugate
Outlet AP

conjugate
Angle Greater Sciatic notch
Angle of inclination of pelvic brim
Angle of

inclination of sacrum
Ischial spine
Ischio-tuberous distance
Foetal head
lie, position, engagement
Clinical Assessment radiological examinationTrue AP ConjugateObstetric ConjugateMid-cavity AP ConjugateOutlet AP conjugateAngle Greater Sciatic notchAngle of inclination of

Слайд 31Thank you

Thank you

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