Sacroiliac

Sacroiliac joint

The sacroiliac joint or SI joint is the joint in the bony pelvis between the sacrum and the ilium of the pelvis, which are joined by strong ligaments. In humans, the sacrum supports the spine and is supported in turn by an ilium on each side. The joint is a strong, weight bearing synovial joint with irregular elevations and depressions that produce interlocking of the two bones.

Anatomy

The sacroiliac joint is a true diarthrodial joint that joins the sacrum to the pelvis. The articular surfaces are covered with a thin layer of hyaline cartilage, which is thicker on the sacral side. The joint space is filled with a highly viscous, clear or pale yellow joint fluid.

Function

The sacroiliac joint serves as a shock absorber between the upper body and the pelvis and lower limbs. It functions as a buffer to limit the transmission of forces from the lower limbs to the spine.

Clinical significance

Dysfunction in the sacroiliac joint, either too much movement (hyper mobility) or too little movement (hypo mobility), can cause various forms of sacroiliac joint dysfunction also termed sacroiliac joint syndrome, sacroiliac joint disorder, sacroiliac joint disease, sacroiliac joint syndrome or sacroiliitis.

See also

• Sacroiliac joint dysfunction
• Sacroiliitis
• Ankylosing spondylitis

References

Sacroiliac Resources
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