5&6. Oestology Of The Pelvis

Question 1

What bones make up the pelvic girdle

Answer 1

Hip bones

Sacrum

Question 2

What do the hip bones articulate with & what is each joint called

Answer 2

Sacrum: sacroiliac joint

Each other: public symphysis

Question 3

What are the differences between the genecoid (female) & android (male) pelvis

Answer 3

Male:
Thick & heavy
Greater pelvis deep
Lesser pelvis narrow & deep
Pelvic inlet heart shaped & narrow
Pelvic outlet smaller
Pubic arch narrow, supra pubic angle 80 degrees
Obturator foramen oval
Acetabulum small
Greater static notch almost 90 degrees

Question 4

What are the bony landmarks of the pelvic inlet

Answer 4

Promontory & ala of sacrum posteriorly

Right & left linda terminalis anteriorly

Question 5

What 3 parameters of the pelvic inlet are assessed clinically

Answer 5

anatomic conjugate:
From sacral promontory to superior border of pubic symphysis

Obstetric conjugate:
From sacral promontory to midpoint of pubic symphysis (min diameter of canal)

Diagonal conjugate:
From sacral promontory to inferior border of public symphysis

Question 6

What are the bony landmarks of the pelvic outlet

Answer 6

Pubic arch anteriorly
Ischial tuberosities laterally
Inferior margin of sacrotuberous ligament posterolaterally
Tip of coccyx posteriorly

Question 7

Describe the spaces of the greater (false) & lesser (true) pelvis
Why are they significant

Answer 7

Greater:
No obstetric significance
Superior to pelvic inlet
Occupied by abdominal viscera

Lesser:
Major obs & gynae significance
Includes
Bony canal - solid, immovable, btw pelvic inlet & outlet
Pelvic surfaces of hip bones, sacrum, coccyx

Question 8

Describe the areas of the female bony pelvis that are assessed clinically

Answer 8

Pelvic inlet: 
Anteroposterior diameter (obstetric & diagonal conjugate)

Mid-pelvis:
Straight side walls, bispinosus diameter

Pelvic outlet:
Infrapubic angle
Distance btw ischial tuberosities

Question 9

Describe a ‘good’ pelvis for childbirth

Answer 9

Round inlet
Straight side walls
Ischial spines not too prominent
Well rounded greater siatic notch
Well curved sacrum 
Sub pubic arch >90 degrees

Question 10

What are the 2 main ligaments of the pelvis

Answer 10

Sacrospinosus

Sacrotuberous

Question 11

What 3 bones make up the pelvis

Answer 11

Ilium
Ischium
Pubis