What is the sacroiliac joint?
The sacroiliac joint (ISG) is the articulated but almost immobile connection between the lower spine (sacrum = Os sacrum) and the two ilia (ilium = Os ilium). Thus, there are two iliosacral joints in the body. The bumpy joint surfaces are covered with a layer of cartilage. Strong, tight ligamentous connections allow only minimal tilting or sideways movements, but these are important for regulating the width of the pelvis – especially during childbirth. During pregnancy, therefore, the ligaments (as well as those of the symphysis = pubic symphysis) loosen due to hormonal changes to allow the passage of the baby’s head at birth.
What is the function of the sacroiliac joint?
Where is the sacroiliac joint located?
The sacroiliac joint is a part of the pelvic girdle. It connects the lower spine (more specifically, the sacrum) to the two ilia.
What problems can the sacroiliac joint cause?
In sacroiliac joint (ISG) syndrome, sufferers experience pain in the area of the joint that can also radiate down the back and into the legs. The discomfort increases during the course of the day and is particularly noticeable when lifting weights, straightening up from bending over, and standing for long periods of time.
Bekhterev’s disease (ankylosing spondylitis) is a chronic inflammatory rheumatic joint disease that usually starts in the paired sacroiliac joint. Early symptoms are nocturnal back pain.
