An imaginary line joining both dimples of Venus passes over the spinous process of the second sacral vertebra.

[2] The term "dimples of Venus", while informal, is a historically accepted name within the medical profession for the superficial topography of the sacroiliac joints.

These indentations are created by a short ligament stretching between the posterior superior iliac spine and the skin.

Another use of the term "dimples of Venus" in surgical anatomy refers to two symmetrical indentations on the posterior aspect of the sacrum, which also contain a venous channel.

They are used as a landmark for finding the superior articular facets of the sacrum as a guide to place sacral pedicle screws in spine surgery.