In Causes of Back Dimples, it was determined that these 'Dimples of Venus' are created by
The linked article in the answer to my original question says nothing more other than the fact that dimples of venus are normal dimples (not medically significant).
The sacroiliac joints move together as a single unit. From the back it is common to see a pair of dimples on the buttock near the base of the spine. These are sometimes called the “dimples of Venus” and they are a landmark for the top portion of the sacroiliac joints.
Posterior superior iliac spine (PSIS) marked in red
Ligaments of the PSIS
Cooperstein & Hickey (2016) has an image of ligaments connected to the PSIS, but unless I am mistaken, the image doesn't seem to have the ligament(s) involved with the dimples of venus.
It seems from the description in Kumar, et al. (2014) that the "dimples of venus ligament(s)" are connected to the skin, and seeing that ligaments are fibrous connective tissues that normally connect bones to other bones, I am intrigued to know more. What is the name of these "dimple of venus ligaments" and what is their purpose?
Cooperstein, R., & Hickey, M. (2016). The reliability of palpating the posterior superior iliac spine: a systematic review. The Journal of the Canadian Chiropractic Association, 60(1), 36.
Kumar, A., Kanojia, R. K., & Saili, A. (2014). Skin dimples. International journal of dermatology, 53(7), 789-797. DOI: 10.1111/ijd.12376