What does diagonal conjugate mean?
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. Pelvic outlet: The pelvic outlet is the distance between the ischial tuberosities and the pubic arch.
Why is diagonal conjugate important?
The diagonal conjugate, which usually measures 12.5 cm or greater, indicates the anteroposterior diameter of the pelvic inlet. The diagonal conjugate is the most useful measurement for estimating pelvic size because a misfit with the fetal head occurs if it is too small.
How is diagonal conjugate measured?
The anteroposterior (or “conjugate”) diameter is the distance between the pubic symphysis and the sacral promontory. The diagonal conjugate: Measured between the sacral promontory and the lower edge of the pubic symphysis, measuring an average of 12.5.
What is obstetrical conjugate?
The distance between the sacral promontory and a point slightly below the upper inner margin of the symphysis pubis; the shortest diameter to which the fetal head must accommodate to descend successfully through the pelvic inlet.
What is external conjugate?
n. 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.
What is the importance of obstetric conjugate?
The obstetric conjugate represents the actual space available to the fetus and extends from the middle of the sacral promontory to the closest point on the convex posterior surface of the symphysis pubis.
Where is the pelvic brim?
The pelvic brim is defined by a line formed by the upper margin of the pubic symphysis anteriorly, and the pectineal line of the pubis, the arcuate line of the ilium, and the sacral promontory (the anterior margin of the superior sacrum) posteriorly.
What makes the pelvic brim?
How common is CPD?
Cephalopelvic disproportion is rare. According to the American College of Nurse-Midwives (ACNM), CPD occurs in 1 out of 250 pregnancies. If you have been diagnosed with CPD, it does not mean that you will have this problem in future deliveries.