Ligament Anatomy
The ligament complex around the SI joint contributes heavily to both stability and pain generation.
Anatomy
Where the sacroiliac joint sits and why it matters.
The sacroiliac joints sit where the sacrum meets the iliac bones. They transfer force from the upper body into the pelvis and legs while helping maintain stability.
Typical Pain Distribution
Symptoms often appear in the buttock, pelvis, groin, posterior thigh, and sometimes lower leg.
Structure
Sacrum
The sacrum forms the triangular base of the spine and acts as the central bridge between the lumbar spine and the pelvis.
Structure
Iliac Bones
The iliac portions of the pelvis create the broad, weight-bearing surfaces that meet the sacrum at the SI joints.
Clinical Relevance
Ligaments And Stability
Much of SI joint stability comes from surrounding ligaments, which is why pain can arise from both the joint surfaces and the supporting tissues.