Answer:
Sacroiliac joint is the slightly movable articulation between the sacrum and posterior portion of the ilium.
Step-by-step explanation:
Sacroiliac joint is also known as SKJ, and is a hip socket that lies on the bones of the pelvis. It is connected by strong ligaments and is one of the very strong joint that supports the weight of upper body.
Sacrum is the element that supports the spine in human body. This sacrum is further supported by the ilium on both sides.