Subsequently, one may also ask, what muscles attach to the posterior superior iliac spine?
The posterior superior iliac spine serves for the attachment of the oblique portion of the posterior sacroiliac ligaments and the multifidus.
Also Know, what causes PSIS pain? One of the most common causes of problems at the sacroiliac joint is a trauma. The force from these kind of injuries can strain the ligaments around the joint. Tearing of these ligaments leads to too much motion in the joint and over time it will lead to degenerative arthritis.
Subsequently, one may also ask, where is PSIS located?
The posterior superior iliac spine (PSIS) is located on the back, just above the buttock. It can usually be seen and felt under the indents just above the buttock.
What muscles attach to Sacrum?
The piriformis muscle, attaching onto the pelvic surface (S2-S4), is one of the major muscles on the sacrum. The iliacus and coccygeus also attach to the pelvic surface superolaterally and inferolaterally respectively.