APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The SI joint is a diarthrodial synovial joint. It is surrounded by a fibrous capsule containing a joint space filled with synovial fluid between the articular surfaces.

Detailed explanation-2: -The sacroiliac joints link the pelvis and lower spine. These two joints are made up of the bony structure above the tailbone, known as the sacrum, and the top part of the pelvis, known as the ilium. The sacroiliac joints support the weight of the upper body when standing.

Detailed explanation-3: -Nearly all of the anterior aspect of the sacroiliac joint is true synovial joint except for the uppermost anterior part which is syndesmotic. Additional extra-articular ligament support is provided by the anterior sacroiliac ligament (arrow), sacrospinous ligament (arrowhead), and sacrotuberous ligament (asterisk).

Detailed explanation-4: -The sacroiliac (SI) joint is located in the pelvis. It links the iliac bone (pelvis) to the sacrum (lowest part of the spine above the tailbone). This joint transfers weight and forces between your upper body and legs. It is an essential component for energy transfer between the legs and the torso.