Is Sacroiliac Joint Disorder Causing Your Back Pain?
Low-back pain does not always come from the lumbar spine itself.
One possible source is the sacroiliac joint, usually shortened to the SI joint. These joints sit where the sacrum at the bottom of the spine meets the pelvis. They transfer load between the upper body and the legs and are supported by strong ligaments and surrounding muscles.
When the SI joint becomes irritated or stops tolerating load well, the pain can feel a lot like ordinary low-back pain.
Where SI Joint Pain Is Usually Felt
SI joint pain is often felt more on one side than directly in the center of the low back.
Common areas include:
- The upper buttock
- The area just below the belt line
- The side of the hip
- The groin
- The back of the thigh
Some people describe pain when getting out of a car, rolling over in bed, standing from a chair, climbing stairs, or spending a long time on one leg.
The problem is that several other conditions can produce similar symptoms. Lumbar disc problems, hip conditions, muscle strains, nerve irritation, and inflammatory disorders can all overlap with SI joint pain.
That is why location alone is not enough for a diagnosis.
What Can Irritate the SI Joint?
The SI joint is built for stability, but it still moves slightly as you walk, bend, and transfer force through the pelvis.
Symptoms may develop after:
- A fall onto one side
- A car accident
- Repetitive lifting or twisting
- A sudden increase in yard work or exercise
- Pregnancy or the postpartum period
- Differences in strength or movement between the hips
- Previous injury affecting how you walk
- Repetitive sports that load one side more than the other
Sometimes there is no single dramatic event. Symptoms may build gradually as the body compensates around another limitation.
How Is SI Joint Dysfunction Evaluated?
A useful evaluation starts with history.
A clinician may ask where the pain is located, what activities trigger it, whether symptoms travel down the leg, and whether there is numbness, tingling, weakness, fever, trauma, or bowel or bladder changes.
The physical examination may look at the lumbar spine, pelvis, hips, gait, strength, flexibility, and neurological function.
There are also specific SI joint provocation tests. Rather than relying on one test, clinicians often use a group of tests to see whether several different movements reproduce the familiar pain.
Imaging is not always needed to diagnose mechanical SI joint dysfunction. X-rays, MRI, or other tests may be used when the history suggests another condition needs to be ruled out.
What Does Treatment Look Like?
Conservative care is often the first step for mechanical SI joint dysfunction.
Treatment may include a combination of:
- Activity modification
- Pelvic and core stabilization exercises
- Hip strengthening
- Mobility work for tight surrounding muscles
- Manipulative therapy when appropriate
- Gradual return to normal activity
The goal is not simply to “put the joint back in place.” The SI joint is held together by strong structures and does not routinely slip in and out.
A better goal is to improve how the pelvis, spine, and hips share load and to reduce irritation while strength and movement control improve.
Why the Hips and Core Matter
The pelvis sits between the spine and the legs. If hip muscles are weak, stiff, or poorly coordinated, more stress may be transferred through the pelvis.
Gluteal strength is especially important because the gluteal muscles help control the pelvis while walking, climbing stairs, running, and standing on one leg.
Core muscles also help the trunk and pelvis work together.
That does not mean everyone with SI pain needs the same exercise program. Someone with too much stiffness may need a different approach from someone with instability or hypermobility.
When Symptoms May Be Coming From Somewhere Else
Several signs should prompt a broader medical evaluation.
Seek prompt care if back or pelvic pain is accompanied by:
- New leg weakness
- Numbness in the groin or saddle area
- Loss of bowel or bladder control
- Fever or unexplained illness
- Significant trauma
- Unexplained weight loss
- Severe night pain
- A history of cancer
- Inability to bear weight
These symptoms are not typical of ordinary mechanical SI joint irritation.
How Homberg Chiropractic Can Help
At Homberg Chiropractic & Wellness, low-back pain is evaluated as part of a connected system.
If the SI joint appears to be involved, the exam may also assess lumbar motion, hip function, leg strength, walking mechanics, and other areas that can influence pelvic load.
Care may include chiropractic treatment, functional rehabilitation, extremity work, and specific exercises based on the findings.
The goal is to help you understand why the area is irritated and what can be changed so the problem is less likely to keep returning.
If you have been calling your symptoms “low-back pain” but the pain consistently sits off to one side near the buttock or pelvis, an evaluation can help determine whether the SI joint is actually part of the problem.
Medical Disclaimer: This article is for educational purposes only and does not replace an in-person evaluation, diagnosis, or treatment plan from a licensed healthcare professional. If you have severe, worsening, or urgent symptoms, seek appropriate medical care.