Reasonable

• SIJ pain changes gait
• SIJ ligament irritation changes motor patterns
• pelvic loading strategies matter
• rehab can improve function

Understanding the Sacroiliac Joint (SIJ): Movement, Pain, and Where Chiropractic Care Can Help

The sacroiliac joint (SIJ) is one of the most discussed—and often misunderstood—areas in musculoskeletal care. Some people are told the SIJ barely moves and “can’t be the problem,” while others are told their pelvis is dramatically “out of alignment” and needs constant correction.

The truth sits somewhere in the middle.

Modern research supports that the SIJ is a real source of pain, it does move, and it plays an important role in load transfer, stability, posture, and gait. At the same time, the idea that tiny positional faults can always be precisely identified by touch alone is much less strongly supported. (Although a highly skilled clinician should be able to see and feel this like our highly skilled practitioners are able to.)

Understanding that balance helps patients make better decisions about treatment—and helps clinicians focus on what matters most: improving pain, function, and quality of life.

Does the SIJ Actually Move?

Yes—absolutely.

The SIJ allows small but important movements known as nutation and counternutation.

Nutation

Nutation occurs when the top of the sacrum moves slightly forward and downward relative to the pelvis.

Counternutation

Counternutation is the opposite movement, where the top of the sacrum moves slightly backward and upward.

These movements are small—usually only a few degrees and a few millimeters—but they are essential for:

• walking and gait mechanics
• transferring force between the spine and legs
• standing balance and postural control
• bending, lifting, and rotational movements
• pregnancy and childbirth adaptations

The SIJ is primarily a stability joint, not a large movement joint. Its role is less about flexibility and more about efficient force transfer.

Is the SIJ Highly Innervated?

Yes.

The SIJ and its surrounding ligaments contain a significant nerve supply, including nociceptors (pain receptors) and mechanoreceptors (load and movement sensors).

This means the SIJ can contribute to:

• local low back pain
• gluteal pain
• referral into the hip or groin
• altered gait patterns
• protective muscle guarding
• feelings of pelvic instability

This is one reason SIJ dysfunction can feel so significant, even though the actual movement of the joint is small.

What Modern Evidence Challenges

Where modern research becomes more cautious is in the idea of “perfect alignment.”

Statements like:

• “your pelvis is out by 5 mm”
• “your sacrum is rotated and stuck”
• “one leg is shorter because your SI joint slipped”

are often far harder to prove reliably than many people realize.

Research shows that palpating tiny SIJ positional differences between practitioners can be inconsistent. In other words, the joint does move—but detecting precise micro-faults manually is not always straightforward.

Pain is often better explained by:

• irritation of ligaments and joint structures
• altered load transfer
• muscle guarding and compensation
• poor movement patterns
• sensitization of the nervous system
• reduced stability and control

rather than a simple “bone out of place” model.

So Where Does Chiropractic Help?

This is where good chiropractic care can be highly valuable.

The goal should not be chasing perfect alignment—it should be restoring comfort, movement confidence, and functional stability.

A modern chiropractic approach may help through:

Improving Joint Tolerance

Gentle mobilization or manipulation may help reduce pain sensitivity, improve movement tolerance, and restore confidence in movement.

Reducing Protective Muscle Guarding

Pain often causes the surrounding muscles to tighten and overprotect the area. Treatment can help reduce this guarding and improve comfort.

Supporting Better Load Transfer

Assessment of gait, pelvic control, hip function, and lumbar mechanics can identify why the SIJ is becoming overloaded in the first place.

Exercise and Rehabilitation

Strengthening the glutes, trunk, hips, and lumbopelvic stabilizers often creates longer-term improvement than passive treatment alone.

Patient Education

Helping patients understand that pain does not always mean damage—and that small joint movements are normal—can reduce fear and improve outcomes.

Chiropractic Should Be About Function, Not Fear

The best chiropractic care does not create dependency.

It should not leave patients believing they are constantly “out” or fragile.

Instead, it should help people understand:

• their body is adaptable
• movement is safe
• pain can improve
• stability can be trained
• recovery is possible

Treatment should empower, not alarm.

Final Thoughts

The SIJ is real.

It moves.

It is well innervated.

It can absolutely be a meaningful contributor to pain and altered movement.

But it is not best understood as a joint that is constantly slipping out of place.

Modern evidence supports a more practical model: pain, load transfer, movement patterns, and nervous system sensitivity matter more than chasing tiny alignment faults.

Chiropractic can be incredibly helpful when it focuses on restoring function, reducing pain, and improving resilience—not simply “putting things back in place.”

That is where the real value lies, so if you are sick of putting up with pain and want to see if your pain in originating in the Sacroiliac Joints, or if your posture may need a bit of help getting “right” we may be able to help you get back on the right track. Located in Sydney’s northern suburbs of Artarmon and Turramurra get in touch to book your initial appointment.