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SI Joint Anatomy/Body Parts
Updated March 2026

Sacroiliac Joint (SI Joint)

Definition

The joint connecting the sacrum to the ilium of the pelvis on each side, which transmits forces between the upper body and lower extremities. SI joint dysfunction is a recognized pain generator in workers' compensation cases and may be evaluated with diagnostic injections and treated with physical therapy, injections, or fusion.

Related Terms

Frequently Asked Questions

What is a Sacroiliac Joint (SI Joint)?

The joint connecting the sacrum to the ilium of the pelvis on each side, which transmits forces between the upper body and lower extremities. SI joint dysfunction is a recognized pain generator in workers' compensation cases and may be evaluated with diagnostic injections and treated with physical therapy, injections, or fusion.

How is sacroiliac joint evaluated in a workers' compensation exam?

Sacroiliac Joint is assessed during the physical examination portion of a QME or AME evaluation. The examining physician documents range of motion, functional limitations, and any objective findings related to sacroiliac joint to support their impairment rating.