SI Joint Pain Treatment: 80% Get Relief With Minimally Invasive Surgery
If you've been told there's nothing more that can be done for your chronic low back pain, new research from 2026 offers hope. A groundbreaking procedure targeting the sacroiliac (SI) joint is helping patients regain their quality of life when traditional treatments fall short.
What Is the Sacroiliac Joint?
The sacroiliac joint connects your spine's base (the sacrum) to your pelvis. As one of your body's largest weight-bearing joints, it transfers force from your upper body into your legs during everyday activities like standing, walking, and lifting. When this joint becomes inflamed or unstable, it can cause significant pain in the lower back, hips, or buttocks that sometimes radiates down the legs.
Here's the challenge: SI joint pain closely mimics conditions affecting the spine or hips, making accurate diagnosis difficult. Research indicates that up to 15% to 30% of people with chronic low back pain actually have pain originating from the SI joint. Many individuals live with symptoms for years—or even undergo unnecessary procedures—before the SI joint is correctly identified as the source.
Why Is SI Joint Pain So Often Missed?
According to Dr. Grant W. Mallory, a neurosurgeon at Mayo Clinic Health System, "Because back pain can come from many sources, finding the true cause is essential before considering surgery." The diagnostic process typically begins with imaging to rule out other causes like infection or tumors. However, imaging alone isn't sufficient. A physical exam that stresses the joint, followed by a diagnostic injection into the SI joint, helps confirm whether it's truly responsible for the pain. If an injection significantly reduces your pain, it confirms the SI joint as the culprit.
Conservative Treatments Come First
Surgery isn't the first step for SI joint pain. Most people begin with conservative treatments including:
- Anti-inflammatory medications
- Physical therapy to strengthen supporting muscles
- Therapeutic injections that can provide temporary relief lasting weeks or months
These approaches aim to reduce inflammation, improve joint stability, and relieve pain without surgery. However, when pain persists beyond six months despite nonsurgical care, patients may be candidates for more definitive treatment.
The Breakthrough: Minimally Invasive SI Joint Fusion
Modern SI joint surgery has evolved dramatically. Today's minimally invasive technique involves a small incision near the hip where surgeons place implants across the joint to stabilize it. These relatively small implants resemble screws with specialized surfaces designed to encourage bone growth. Over time, bone grows across the joint, creating lasting stability and reducing painful movement.
The procedure typically takes less than an hour, and some patients can return home the same day. Most people have activity restrictions for about six weeks after surgery. Pain relief may be noticeable early, particularly when excessive joint motion was the cause, while arthritis-related pain may improve more gradually.
What the Latest Research Shows
A landmark 2026 study published in La Radiologia Medica evaluated CT-guided SI joint injections in 80 patients with chronic sacroiliitis. The findings were remarkable:
- Pain scores (NRS) improved from 6.86 at baseline to 2.26 at six months—a 67% reduction
- Disability scores (ODI) decreased from 37.28 to 5.68 over the same period
- All procedures were technically successful with zero complications
- Both inflammatory and degenerative cases showed significant improvement
- Age and BMI did not significantly affect outcomes
The study authors concluded that "CT-guided SIJ injection is a safe and effective intervention for sacroiliitis, yielding sustained pain relief and functional improvement across diverse patient profiles."
The STACI Study: Surgeons vs. Pain Management Physicians
Another major 2026 study published in PM&R examined whether interventional pain management physicians could achieve results comparable to surgeons when performing lateral SI joint fusion. The prospective, multicenter trial at 15 U.S. sites included 112 patients.
Key findings at six months:
- Mean SI joint pain decreased by 5.2 points (91% had at least a 2-point improvement)
- Oswestry Disability Index improved by 25.8 points
- No serious or device-related adverse events occurred
- Results matched outcomes from surgeon-performed randomized trials
The study demonstrated that "clinically significant improvements in pain and disability are commensurate with results from surgeon-performed randomized trials and published literature."
Who Makes a Good Candidate?
Not everyone with SI joint pain needs surgery. According to Mayo Clinic experts, candidates for SI joint fusion typically meet these criteria:
- Confirmed SI joint pain through diagnostic injection
- Pain lasting longer than six months
- Failed conservative treatments (medications, physical therapy, injections)
- No widespread inflammatory arthritis
- No serious medical issues making anesthesia unsafe
- Non-smoker or willing to quit (smoking interferes with bone healing)
Long-Term Outcomes: What to Expect
By six months post-surgery, approximately 80% of patients report improved quality of life and pain reduction. Studies show these improvements can last for years. A 2025 multicenter study published in Orthopedic Reviews followed 258 patients for an average of 1.75 years and found:
- Mean pain reduction of 6.01 points from baseline
- No serious adverse events reported
- Sustained functional improvement throughout the follow-up period
The research affirms that "posterior SI joint fusion constitutes an effective and enduring treatment option for patients suffering from SI joint dysfunction unresponsive to conservative care."
Beyond Fusion: Other Minimally Invasive Options
Not all patients need fusion. A 2026 systematic review in Acta Neurochirurgica evaluated full-endoscopic sacroiliac joint denervation, a novel technique that increases the surface area for nerve ablation. The review of six studies encompassing 169 patients found:
- Significant pain reduction from baseline (4.85 points)
- Improved disability scores (17.30 points on ODI)
- Mean follow-up of 18 months
- No complications reported
This minimally invasive approach "demonstrates favorable short- to mid-term clinical outcomes and a low reported complication rate."
The Importance of Accurate Diagnosis
Getting the right diagnosis matters more than ever. Dr. Mallory emphasizes, "If you've been told nothing can be done for chronic low back pain, don't lose hope. For some people, SI joint pain may be the cause, and effective treatments, including surgery, are available."
The key is working with specialists who understand SI joint dysfunction and can perform proper diagnostic testing. This may include:
- Comprehensive physical examination with provocation tests
- Imaging studies (X-ray, MRI) to assess joint structure
- Diagnostic injections to confirm pain source
- Evaluation by a pain management specialist or orthopedic surgeon
Living With SI Joint Pain: Red Flags to Watch For
If you experience any of the following, seek medical evaluation promptly:
- Pain that interferes with sleep or daily activities
- Numbness, tingling, or weakness in the legs
- Loss of bowel or bladder control
- Pain following trauma or injury
- Symptoms worsening despite conservative treatment
The Bottom Line
Chronic low back pain doesn't have to be a life sentence. For the 15-30% of patients whose pain originates from the sacroiliac joint, modern minimally invasive treatments offer real hope. With success rates around 80% and procedures that can be completed in under an hour, SI joint fusion has become a viable option when conservative measures fail.
The key is accurate diagnosis and working with experienced specialists who can guide you through the full spectrum of treatment options—from injections to minimally invasive surgery—tailored to your specific condition.
References
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Balbaa MF, Barile A, El Shafei MM, et al. CT-guided sacroiliac joint injection for chronic sacroiliitis: outcomes and predictors in a retrospective cohort study. La Radiologia Medica. 2026;131(3):456-467. Published March 11, 2026. DOI: 10.1007/s11547-026-02191-3
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Weisbein J, Davis T, Beall D, et al. Minimally invasive sacroiliac joint fusion: Primary endpoint results from the prospective, multicenter STACI study. PM&R. 2026;Online ahead of print. Published January 30, 2026. DOI: 10.1002/pmrj.70095
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Gottlieb J. Mayo Clinic Q&A: Can surgery alleviate sacroiliac joint pain and issues? Mayo Clinic News Network. Published February 25, 2026. https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-qa-can-surgery-alleviate-sacroliac-joint-pain-and-issues/
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Halalmeh DR, Ansari YZ, Jader A, et al. Efficacy and safety of full-endoscopic sacroiliac joint denervation for the treatment of chronic low back pain: a systematic review. Acta Neurochirurgica. 2026;168(1):48. Published February 25, 2026. DOI: 10.1007/s00701-026-06807-5
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Bovinet C, Antony A, Azeem N, et al. Minimally invasive posterior SI joint fusion with a novel cortical allograft: Real-world, long-term outcomes from a large, multisite US cohort. Orthopedic Reviews. 2025;17:381-390. Published August 14, 2025. DOI: 10.2147/ORR.S538286
Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider for diagnosis and treatment of chronic pain conditions. Individual results may vary, and what works for one patient may not be appropriate for another. If you experience severe or worsening symptoms, seek immediate medical attention.