Salk et al reported measurements indicative of a gynecoid pelvis. The gynaecoid and anthropoid pelvis are favorable for vaginal delivery. The authors are from Cumhuriyet University and Sivas State Hospital in Turkey.
Measurements are made on a nonpregnant female using CT of the pelvis
At pelvic inlet:
(1) obstetric conjugate > 10.5 cm
(2) transverse diameter > 13 cm
(3) posterior sagittal diameter > 4.5 cm
In midpelvis, greatest diameter:
(1) anterior posterior diameter > 12.5 cm
(2) transverse diameter > 12.5 cm
(3) posterior sagittal diameter > 4.5 cm
In midpelvis, plane of least diameter:
(1) anteroposterior diameter > 12.5 cm
(2) interspinous diameter > 10.5 cm
(3) posterior sagittal diameter > 4.5 cm
At pelvic outlet:
(1) anteroposterior diameter > 11 cm
(2) intertuberous diameter > 11 cm
(3) posterior sagittal diameter > 4 cm
Figure 2 shows landmarks for making measurements on imaging studies.
