Examination Of The Pelvis Flashcards
Bones of the pelvis
Sacrum
Coccyx
Two innominate bones (right and left)
Functions of the pelvis
Bear weight of upper body
Contain and protect the pelvic organs
Child bearing function
Joints of the pelvis
Sacroiliac synchindroses
Pubic symphysis
What separates true and false pelvis?
Linea terminalis
What are the boundaries of a false pelvis?
L: iliac fossa
A: abdominal wall
P: lumbar vertebra (L4-L5)
What are the boundaries of the true pelvis?
L: ischial bones, sacrosciatic notch, ligaments
A: pubic bones
P: sacrum
What are the boundaries of the true pelvis? 2.0
Above: sacral promontory and alae of sacrum, linea terminalis, upper margins of pubic bones
Below: pelvic inlet
Distance b/w sacral promontory and tip of sacrum
10cm
Distance b/w anterior curvature of sacrum
12cm
What is the clinical importance of the biischial distance
Smallest diameter of pelvic cavity wherein the biparietal diameter of baby will pass through
Clinical correlation of sacrum
Clinical pelvimetry
Relaxation of pelvis starts when?
Starts: first half of pregnancy, increases the last 3 months
Returns to normal after delivery
Sacroiliac joint mobility is caused by?
Upward gliding of sacroiliac joint
Dorsal lithotomy position increases/decreases diameter by
Increases, 1.5-2
McRoberts maneuver
Shoulder dystocia; pelvis tilts, pubic symphysis more horizontal –> shoulder delivery
Modified squatting position
Increase interspinous diameter
Increase pelvic outlet diameter
Hasten 2nd stage of labor
Planes and diameters of pelvis
Plane of pelvic inlet - superior strait
Plane of midpelvis - least pelvic dimensions
Plane of pelvic outler - inferior strait
Plane of greatest pelvic dimension - no obstetrical significance
Boundaries of pelvic inlet
L: linea terminalis
A: horizontal pubic rami of pubic symphysis
P: sacrum alae and promontory
