Female Pelvis Diameters



Antero posterior:
Anatomical conjugate/true conjugate/conjuagate vera: It is the distance between the mid point of the sacral promontory to the inner margin of the upper border of symphysis pubis. It measures 11 cm.
Obstetric conjugate: it is the distance between the midpoint of sacral promontory to prominent  bony projection in the midline on the inner surface of the symphysis-pubis. It measures  10 cm
Diagonal conjugate: it is the distance between the lower border of symphysis pubis to the midpoint of sacral promontory. It measures 12 cm
Transverse diameter: It is the distance between the two farthest points on the pelvic brim over the ilio pectineal lines. It measures 13 cm
Oblique diameters:
There are two oblique diameters- right and left. Each one extends from one sacro iliac joint to the opposite ilio pubic eminence and measures about 12 cm. (right or left denotes the  sacro iliac joint from which it starts)
Cavity is the segment of the pelvis bounded by the inlet and below by plane of least pelvic dimensions.
Antero- posterior: It measures from the midpoint of the posterior surface of the symphysis pubis
to the junction of 2nd or 3rd  sacral vertebrae. It measures about 12 cm
Transverse/ oblique diameter:
It cannot be precisely measured as the points lie over the soft tissues covering the sacro sciatic notches and obturator foramina.

Obstetrical outlet : It is the segment of pelvis bounded above by the plane of least pelvic dimensions and below by the anatomical outlet.
Transverse: (Bispinous) it is the distance between the tip of two ischial spines. It measures
10.5 cm
Antero posterior: It extends from the inferior border of the symphysis pubis to the tip of sacrum. It measures 11 cm.
Posterior sagital: it is the distance between the tip of the sacrum and midpoint of the bispinous    diameter, 5 cm.
Anatomical outlet : Known as bony outlet.. It is bounded in front by the lower border of the symphysis pubis; laterally by the ischiopubic rami, ischial tuberositv and sacro spinous ligament and posteriorly by the tip of coccyx.
It is diamond shaped
Antero posterior diameter: extends from the lower border of symphysis pubis to the tip of coccyx. It measure 13 cm
 Transverse ( inter tuberous ) : It measure between the inner borders of ischial tuberosities. It is 11 cm  .
Oblique diameter : it is said to be between the obturator foramen and the sacro spinous ligament. It  is 12cm

Anterior –Posterior
(in cms)
(in cms)
(in cms)
Inlet (brim)

Types of pelvis:

The gynaecoid pelvis
The android pelvis
The anthropoid pelvis

The platypelloid pelvis



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notes.nursium.com: Female Pelvis Diameters
Female Pelvis Diameters
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