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Chiropractic Glossary

What Is The Sacroiliac Joint?

Chiropractic Care & Spinal Health ·
Quick Answer

The sacroiliac joint, often called the SI joint, is where the sacrum meets the ilium of the pelvis on each side of the lower back. These two strong, low-motion joints help transfer weight between the upper body and the legs.

Why Sacroiliac Joint Matters for Your Spinal Health

The SI joints are built for stability rather than large movement, relying on tough ligaments to hold them firmly while still allowing small, important shifts during walking and bending. When one joint becomes too stiff or too loose, it can produce sharp or aching pain in the lower back, buttock, or hip. Car accidents and falls can sprain these ligaments, making the SI joint a key area chiropractors check during recovery from a crash.

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Conditions & Symptoms Related to Sacroiliac Joint

Dysfunction in the sacroiliac joint can lead to symptoms such as:

  • Pain on one side of the lower back or buttock
  • Discomfort when climbing stairs or rolling over in bed
  • A sense of the pelvis catching or locking
  • Pain that may extend into the hip or back of the thigh

SI joint pain is often felt low and to one side, which helps distinguish it from other back problems.

Common Misconceptions About Sacroiliac Joint

One misconception is that all lower-back pain comes from a disc. The SI joint is a frequently overlooked source of pain that sits below the spine itself.

Another is that the SI joint does not move at all. It actually allows small but meaningful motion, and losing that motion can cause discomfort.

How Chiropractors Evaluate & Treat Sacroiliac Joint

To evaluate and care for the sacroiliac joint, a chiropractor may use:

  • Orthopedic tests that stress the SI joint to locate pain
  • Adjustments or mobilization to restore balanced joint motion
  • Soft-tissue therapy for the surrounding hip and back muscles
  • Recommendations for supportive stretches and core stability

Targeted care aims to settle the joint, ease one-sided pain, and improve pelvic stability.

When to See a Chiropractor About Sacroiliac Joint

Why Chiropractic Care After an Accident
Evidence-Based Treatment
Over 100 studies support chiropractic effectiveness for back pain, with patients reporting 73% satisfaction rates compared to 17% for medical care.
Drug-Free Approach
Chiropractic care offers a natural alternative to pain medication, reducing reliance on opioids and their associated side effects and risks.
Whole-Body Wellness
Chiropractic care addresses the root cause of health issues rather than just the symptoms, supporting long-term recovery after an accident.

See a chiropractor if you have one-sided lower-back or buttock pain that flares with stairs, standing, or shifting positions.

Seek evaluation after a car accident or fall, since impact can sprain the SI joint ligaments.

Arrowhead Clinic helps accident victims recover at chiropractic clinics across Georgia, including Atlanta, Savannah, and Brunswick — with same-day appointments at a walk-in chiropractor near you.

Key Takeaways

  • The SI joint connects the sacrum to the pelvis on each side
  • It is built for stability and allows only small motion
  • It transfers weight between the upper body and legs
  • Dysfunction often causes one-sided lower-back or buttock pain
  • Chiropractors use specific tests and adjustments to treat it
  • Crash and fall impacts can sprain the SI joint ligaments

Frequently Asked Questions

Where is the sacroiliac joint located?
There are two SI joints, one on each side of the lower back, where the triangular sacrum meets the pelvic bones.
What does SI joint pain feel like?
It is usually a one-sided ache or sharp pain in the lower back or buttock that can worsen with stairs, standing, or rolling in bed.
Can a chiropractor treat the SI joint?
Yes. Chiropractors use specific tests and gentle adjustments to restore normal motion and reduce SI joint pain.