Female pelvis Flashcards
Difference between true and false pelvis
False is above pelvic brim and forms part of abdominal cavity
Components of true pelvis
Inlet(pelvic brim)
Cavity
Outlet
Diameters of the inlet
Transverse diameter(13.5cm) is wider than AP(11cm)
Diameters of cavity
AP same as transverse. 12cm
Significance of ischial spine
Assess descent of baby
Landmark for anaesthetic block
Diameter and shape of outlet
AP 13.5 wider than the transverse diameter 11cm
Diamond
Types of pelvis according to Caldwell Moloy Swenson
Gynecoid
Android
Anthropoid
Platypelloid
Difference between gynecoid and anthropoid pelvis
Transverse diameter wider than anterioposterior diameter in gynecoid
Define diagonal conjugate
The distance from the sacral promontory to the lower margin of the the pubic symphysis
Define true or obstetric conjugate
Distance from sacral promontory to the back of the symphysis pubis. Measured indirectly by subtracting 1.5cm from diagonal conjugate.
What’s the optimum diagonal conjugate for vaginal delivery
Greater than 11.5cm
Xtics of inadequate cavity
Prominent ischial spine
Side walls are felt to converge
Concavity of sacrum is hollow
What diameter is used to estimate adequacy of pelvic outlet
Intertuberous diameter
When is intertuberous distance deemed adequate
Closed fist fit between tuberosity
When is sub pubic arch deemed adequate
90 degrees
