ANATOMY

Detailed explanation-1: -The sacrum forms the posterior pelvic wall and strengthens and stabilizes the pelvis. Joined at the very end of the sacrum are two to four tiny, partially fused vertebrae known as the coccyx or “tail bone". The coccyx provides slight support for the pelvic organs but actually is a bone of little use.

Detailed explanation-2: -The sacrum is a large flat bone in the lower part of the spine, forming the rear section of the pelvis in humans. The coccyx, also known as the tailbone, is the very end of the spine, located right below the sacrum. Both are triangular and are composed of multiple vertebrae fused into a single bone.

Detailed explanation-3: -What is the tailbone/coccyx? Your coccyx is made up of three to five fused vertebrae (bones). It lies beneath the sacrum, a bone structure at the base of your spine. Several tendons, muscles and ligaments connect to it.

Detailed explanation-4: -The coccyx can become injured by a sudden fall, childbirth, excessive flexing when sitting, a partial dislocation, or a bony spur. Obesity increases the risk of pain because it places more stress on the tailbone. Pain also can develop for no known reason.

Detailed explanation-5: -The sacroiliac joint connects the spine to the pelvis. Without it, you wouldn’t be able to stand or walk. As the name suggests, the sacroiliac joint sits between the sacrum and the iliac bones of the lower back, in the area where the spine meets the pelvis.