SI Joint Dysfunction: Why Your Hip and Back Pain May Not Be Coming From Your Disc
Updated: Sep 3
Have you been dealing with stubborn lower back or hip pain that just won't seem to go away? When your back hurts, it is easy to assume that a damaged spinal disc is the culprit. In fact, most people searching for answers automatically point their finger at their spine. However, the true source of that deep, aching pain is a completely different structure called the sacroiliac (SI) joint.
Because this small but important joint sits right in the middle of everything, problems here are frequently misdiagnosed as standard disc issues, hip problems, or even classic sciatica. This mix-up leaves many people trying treatments that target the wrong spot, never getting real, lasting relief.
At Groth Pain and Spine, we focus on identifying the true pain generator. Recognizing SI joint dysfunction can be an important step toward effective treatment and long-term improvement.
What Is the SI Joint?
The sacroiliac (SI) joints are located on both sides of the lower back where the sacrum meets the iliac bones of the pelvis. These joints absorb and transfer forces between the upper body and legs. They provide stability during movement and have very limited but important motion.
Because the SI joint plays a major role in weight transfer, even small dysfunctions can result in considerable pain and disability.
What Is SI Joint Dysfunction?
SI Joint Dysfunction occurs when the joint becomes inflamed, hypermobile (too loose), hypomobile (too stiff), or degenerative due to arthritis or prior injury.
This dysfunction can lead to localized pain as well as referred pain patterns that mimic other conditions.
Common Symptoms of SI Joint Pain
Pain in the lower back, just off midline
Buttock pain (often one-sided)
Pain radiating into the groin or upper thigh
Pain that worsens with standing or walking
Discomfort when transitioning from sitting to standing
Pain when climbing stairs or turning in bed
Unlike disc-related radiculopathy, SI joint pain does not follow a clear nerve root pattern.
Why Is SI Joint Pain Often Misdiagnosed?
Misdiagnosis commonly happens because:
MRI and CT scans may appear normal
Symptoms overlap with lumbar disc disease
Pain can mimic hip joint pathology
Physical exam findings can be subtle
Patients are often treated for lumbar disc herniation or facet joint arthritis before the SI joint is considered.
Schedule Your SI Joint Evaluation in Long Island - Call 631-543-1440 |
How Pain Management Doctors Diagnose SI Joint Dysfunction
Accurate diagnosis requires a combination of clinical evaluation and targeted testing.
1. Detailed History
Pain management doctors evaluate several clinical factors before choosing the treatment plan.
Location and quality of pain
Whether pain is unilateral or bilateral
Activity-related triggers
Prior spine or hip treatments
Response to previous injections
2. Physical Examination
It includes:
SI joint provocative tests
Palpation over the posterior superior iliac spine
Gait and pelvic alignment assessment
Hip range of motion testing
No single test can confirm SI joint dysfunction, but several positive test results together can strongly suggest it.
3. Imaging Studies
Imaging usually includes:
X-rays of the pelvis and lumbar spine
MRI of the lumbar spine to rule out disc pathology
Hip imaging when appropriate
Importantly, imaging is often normal in SI joint dysfunction, which is why clinical evaluation is important.
4. Diagnostic SI Joint Injections
The best way to pinpoint the problem is with a specialized diagnostic injection. A doctor uses a live, high-tech X-ray machine to carefully guide a tiny needle directly into the joint. Then, they inject a small amount of numbing medicine.
If your daily pain vanishes or drops significantly right after the joint gets numbed, it suggests that the SI joint is the primary source of pain.
What Are the Treatment Options for SI Joint Dysfunction?
Conservative Treatments
These are the basic treatments, including:
Physical therapy focused on pelvic stabilization
Core strengthening
Activity modification
Anti-inflammatory medications when appropriate
SI belts for external stabilization
These measures may help mild cases or be used alongside interventional treatments.
Corticosteroid injections into the SI joint can reduce inflammation and provide temporary relief.
They are commonly used for SI joint arthritis, acute flare-ups of chronic dysfunction, and diagnostic and therapeutic purposes.
Radiofrequency Ablation of SI Joint Lateral Branches
For patients with confirmed SI joint pain, radiofrequency ablation can target the lateral branch nerves that transmit pain from the joint.
Its Benefits
Longer-lasting relief compared to injections
Improved ability to stand and walk
Reduced reliance on medications
Minimally invasive outpatient procedure
It may be appropriate and can provide excellent long-term pain relief when:
Pain has persisted for more than 6 months despite conservative care
The patient has had significant but temporary relief from diagnostic SI joint injections
Radiofrequency ablation and injections provide only short-term or incomplete relief
SI joint dysfunction is clearly confirmed as the primary pain generator
The patient has difficulty walking, standing, or performing daily activities
SI Joint Pain vs Disc Pain: Main Differences
SI Joint Pain
Located off midline in the lower back or buttock
Worse with standing, walking, and stairs
No clear nerve root radiation pattern
Often unilateral
Disc-Related Pain
May radiate down the leg in a dermatomal pattern
It's often associated with nerve symptoms (numbness, tingling, weakness)
It can worsen with sitting or flexion
When to See a Pain Management Specialist?
You should consider evaluation if:
Low back or buttock pain persists beyond 6-8 weeks
MRI does not clearly explain symptoms
Prior spine treatments have failed
Pain is limiting walking or daily function
There is suspicion of SI joint involvement
Early diagnosis can prevent prolonged ineffective treatment targeting the wrong structure.
Get Personalized Pain Care in Long Island - Call 631-543-1440 |
Common Questions About SI Joint Pain
Why does my hip hurt on one side when my lumbar MRI shows everything is normal?
It is incredibly common to have severe hip and lower back pain even when your lower back scans look perfectly clean. A standard lumbar MRI looks specifically at your spine and spinal discs, completely missing the sacroiliac joints located further down.
When you have SI joint dysfunction, this pelvic joint gets irritated and spreads pain sideways into your buttock and hip. Because the nerve pathways in your lower body overlap, your brain gets confused and makes you feel a hip problem even though the true trouble spot is hidden right in your pelvic joint.
Can SI joint pain radiate down into the leg like sciatica?
Yes, it can, which is exactly why it gets misdiagnosed so often. While true sciatica comes from a compressed nerve in your lower spine, an inflamed pelvic joint can trigger “referred pain” that travels down into your groin, upper thigh, and occasionally past the knee.
The major difference is that SI-related leg discomfort usually feels like a deep, dull ache rather than the sharp, electric zaps or numbness that you get with a classic spinal nerve issue.
How long does it take for SI joint injections to start working?
When you receive diagnostic or therapeutic SI joint injections, the timeline happens in two distinct parts. The numbing medicine in the injection works instantly, giving you a few hours of relief to help your SI joint specialist confirm the diagnosis.
Once that numbing medicine wears off, you might feel a tiny bit of temporary soreness. The actual steroid medication takes about 2 to 7 days to fully kick in, calm the deep inflammation, and deliver the long-lasting sacroiliac joint pain relief you are waiting for.
Takeaway
SI joint dysfunction is common. It's an overlooked cause of low back, hip, and buttock pain. Because symptoms often overlap with disc and hip conditions, accurate diagnosis is most important for effective treatment.
If your symptoms have not improved with previous treatments, it may be time to have your SI joint evaluated.
Find the Real Cause of Your Pain at Groth Pain and Spine
If ongoing back or hip pain is affecting your daily life, the team at Groth Pain and Spine can help.
At Groth Pain and Spine, we have over 20 years of experience in pain management on Long Island. Led by Dr. Timothy Groth, our SI joint specialists use detailed clinical evaluation and image-guided diagnostic injections to identify SI joint pain and then provide targeted treatments.
Our clinics are available at multiple convenient locations in Long Island, so you can easily reach out to us. We also accept most major insurance plans, Workers’ compensation, and no-fault coverage. We make sure our patients don’t have to worry about anything when they are under our treatment.
Call us at 631-543-1440 to book your immediate appointment in Long Island.
Comments