Question

What does intertuberous diameter measure? When is it considered adequate?

a) Measures the distance between the ischial tuberosities; considered adequate if ≥10 cm
b) Measures the distance between the sacral promontory and the symphysis pubis; considered adequate if ≥10 cm
c) Measures the distance between the anterior superior iliac spines; considered adequate if ≥10 cm
d) Measures the distance between the sacral promontory and the anterior superior iliac spines; considered adequate if ≥25 cm

Answer 1

The intertuberous diameter measures the distance between the ischial tuberosities and is considered adequate for childbirth if it is 10 cm or more.

Step-by-step explanation:

The intertuberous diameter measures the distance between the ischial tuberosities, which are large, roughened protuberances that form the posteroinferior portion of the hip bone and serve as weight-bearing regions when sitting. The ischial tuberosities are separated laterally by this diameter, and it is an important measurement in obstetrics as it relates to the pelvic outlet size which must be adequate for childbirth. The intertuberous diameter is considered adequate if it is ≥10 cm, as it suggests there is enough space for the passage of a fetus during vaginal delivery. Thus, the correct answer is (a) Measures the distance between the ischial tuberosities; considered adequate if ≥10 cm.