What does a subpubic angle of 90 degrees indicate?

A subpubic angle of 90 degrees is an anatomical measurement that is typically indicative of a female pelvic structure. In females, the pelvic inlet is generally broader, and the subpubic angle is wider, allowing for the passage of a fetus during childbirth. A measurement around 90 degrees or greater is characteristic of female anatomy, which is adapted for reproduction.

In contrast, a male pelvic structure generally has a narrower subpubic angle, often less than 90 degrees. This anatomical difference between male and female pelves is crucial for understanding childbirth as well as variations in pelvic health. The other options, such as an infant pelvis or a non-human pelvis, do not specifically correlate with a subpubic angle of 90 degrees, as they involve different anatomical characteristics that do not align with this particular measurement in adult human anatomy.