What is obstetric conjugate?
Pelvic inlet: The obstetrical conjugate is the distance between the sacral promontory and the inner pubic arch; it should measure 11.5 cm or more. The diagonal conjugate is the distance from the undersurface of the pubic arch to sacral promontory; it is 2 cm longer than the obstetrical conjugate.
How is the obstetric conjugate determined?
The obstetric conjugate: Measured from the sacral promontory to the point bulging the most on the back of the symphysis pubis, located about 1 cm below its upper border. It measures 10.5 cm on average; it is the lesser anteroposterior diameter.
What is true or gynecological conjugate?
In obstetrics, the distance between the midline superior point of the sacrum and the upper margin of the symphysis pubis. It is the anteroposterior diameter of the pelvic inlet, estimated by subtracting 1.5 to 2 cm from the measurement of the diagonal conjugate. Synonym: conjugata vera.
Can obstetric conjugate be measured clinically?
The pelvic inlet can be evaluated clinically for its anteroposterior diameter. The obstetric conjugate can be estimated from the diagonal conjugate, which is obtained during clinical examination (seeFigure 8-3).
What is obstructive conjugate?
n. The shortest pelvic diameter through which the fetal head must pass during birth, measured from the promontory of the sacrum to a point a few millimeters from the top of the pubic symphysis.
What is the best pelvic type for delivery?
Gynecoid. The gynecoid pelvis is thought to be the most favorable pelvis type for a vaginal birth. This is because the wide, open shape give the baby plenty of room during delivery.
Which pelvis is best for delivery?
How do you calculate conjugate Vera?
In obstetrics, the distance between the midline superior point of the sacrum and the upper margin of the symphysis pubis. It is the anteroposterior diameter of the pelvic inlet, estimated by subtracting 1.5 to 2 cm from the measurement of the diagonal conjugate.
What is the true conjugate?
Description. The true conjugate (anatomical onjugate, anteroposterior diameter) extends from the sacrovertebral angle (promontorium) to the pubic symphysis; Average measurement in female: about 110 mm.
What is external conjugate?
The distance in a straight line between the depression under the last spinous process of the lumbar vertebrae and the upper edge of the pubic symphysis.
How do you find the true conjugate?
In order to find the true conjugate one has to subtract 1.5—2 cm from the diagonal conjugate depending on the circumference of the radiocarpal articulation: if the circumference makes 15 cm — 1.5 cm, if it makes 16 cm and more — 2 cm.