Sacroiliac joint, but there are also a few ligaments that connect the two bones.
I think the sacrum and coxal bone are joined at the sacroiliac joint.
The joint between the sacrum and the hip bone is the sacroiliac joint. It is also known as the SI joint. They form the articular surfaces.
The sacrum is the composite bone that articulates with the hip bone laterally at the sacroiliac joint. The sacrum is a large, triangular bone at the base of the spine formed from the fusion of several vertebrae.
sacrum
The SI joint, also known as the sacroiliac joint, is located in the pelvis. It connects the sacrum (the triangular bone at the base of the spine) to the ilium (the large, wing-shaped bone in the pelvis).
The auricular surface of the sacrum articulates with the ilium of the pelvis to form the sacroiliac joint. This joint is a weight-bearing joint that plays a crucial role in transmitting forces between the spine and the lower limbs during activities like walking and running.
The ilium is a large, blade-shaped bone in the pelvis. "Iliac" typically refers to structures or conditions related to the ilium or iliac bone, such as the iliac crest or iliac artery. So, they are related anatomical terms, with ilium being the bone itself and iliac referring to aspects of the ilium bone.
The sacrum articulates with the ilium bones of the pelvis to form the sacroiliac joints.
Ilium - you have one either side of your midline. The continue from the sacrum at the back to the pubis at the front. The uppermost part is called the iliac crest. You can normally feel the Anterior Superior Iliac spine as your front "hip bone" and the Posterior Superior Iliac spine as your rear "hip bone" - they are different parts of the same continuous bone.
The iliac bone is one of the three bones that make up the os coxae (hip bone) in the human pelvis. It is located on each side of the pelvis and is commonly known as the "hip bone." The iliac bone helps support the weight of the body and serves as an attachment point for various muscles.
The pelvis is made up of three bones; the ilium, the ischium, and the pubic bone. Attached to the back of the pelvis is the sacrum/coccyx which are two bones made of multiple vertebrae that are fused together. Also connected to the pelvic bone is the head of the femur (thigh bone) which sits in the acetabulum of the pelvis and creates the acetabulofemoral joint also known as the hip joint.
You are probably asking about the sacrum, which is 6 bones that fuse together as a child matures. This is not an arthropoidal joint like the knee or elbow that rotates around. There are strips of super-slick tissue on the hip bone that allow the sacrum to shift slightly. These can become damaged or worn, and cause considerable pain.