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What Is Sacroiliac Joint Fusion?

Sacroiliac joint fusion is surgery that stabilizes the joint connecting the sacrum to the ilium by placing implants and promoting bone growth across the joint. Modern procedures are commonly performed through minimally invasive lateral, posterolateral, or posterior approaches. The goal is to reduce painful motion in a sacroiliac joint identified as a primary pain generator. Patient selection is especially important because low back and buttock pain can arise from many structures other than the sacroiliac joint.

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What Is Sacroiliac Joint Fusion?

Sacroiliac joint fusion is surgery that stabilizes the joint connecting the sacrum to the ilium by placing implants and promoting bone growth across the joint. Modern procedures are commonly performed through minimally invasive lateral, posterolateral, or posterior approaches. The goal is to reduce painful motion in a sacroiliac joint identified as a primary pain generator. Patient selection is especially important because low back and buttock pain can arise from many structures other than the sacroiliac joint.

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Why Is Sacroiliac Joint Fusion Performed?

The procedure is considered for carefully selected patients with chronic sacroiliac joint pain who have not improved sufficiently with conservative treatment. Diagnosis usually combines pain location, provocative examination maneuvers, exclusion of competing causes, and substantial temporary relief after an image-guided diagnostic sacroiliac joint injection. Current multispecialty consensus guidance describes the evidence supporting minimally invasive fusion as weak or very weak, even though several trials and cohort studies report improvement in selected patients. The decision therefore requires careful discussion of diagnostic uncertainty, expected benefit, alternatives, implant approach, and surgical risk.

How Is Sacroiliac Joint Fusion Performed?

Minimally invasive fusion is performed through small incisions using fluoroscopy, three-dimensional navigation, or other imaging to guide implant placement across or within the sacroiliac joint. Lateral transiliac techniques place one or more implants from the ilium across the joint into the sacrum. Posterior and posterolateral techniques use different implant trajectories intended to stabilize the joint and support bone growth. Bone graft or biologic material can be added depending on the implant system and surgical technique.

What Is Recovery Like After Sacroiliac Joint Fusion?

Walking begins after surgery according to pain, implant stability, and the surgeon's protocol. Some lateral procedures require temporary partial weight-bearing with crutches or a walker before progression to full weight-bearing. Physical therapy later focuses on gait, hip and core strength, mobility, and return to daily activity while avoiding excessive early stress across the fusion site. Bone integration and fusion develop over months, so improvement can continue gradually during follow-up.

What Are the Risks and Complications?

Possible complications include infection, bleeding, wound problems, persistent pain, implant loosening, implant malposition, and failure of the joint to fuse. A misplaced implant can irritate or injure nearby sacral nerve roots and can require revision surgery. Fracture, vascular injury, or other neurologic complications are uncommon but possible. Some patients do not improve despite technically successful fusion because the sacroiliac joint was not the only source of pain or because another pain generator remains.

Frequently Asked Questions About Sacroiliac Joint Fusion

How is SI joint pain confirmed before fusion?

Evaluation commonly combines characteristic pain, provocative examination tests, exclusion of other causes, and meaningful temporary pain relief after an image-guided diagnostic sacroiliac joint injection.

Is sacroiliac joint fusion always open surgery?

No. Most contemporary procedures are minimally invasive and use small incisions with imaging guidance to place implants across or within the joint.

How strong is the evidence for minimally invasive SI joint fusion?

Evidence is mixed. Several studies report meaningful improvement, while a recent multispecialty guideline rated the evidence for benefit in carefully selected patients as weak or very weak.

Can pain continue after sacroiliac joint fusion?

Yes. Persistent pain can occur from incomplete fusion, implant problems, or another spinal, hip, muscular, or pelvic pain source that remains untreated.

References

Consensus practice guidelines on sacroiliac joint complex pain from a multispecialty, international working group. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC12681192/. Date Accessed September 11, 2026.

Minimally invasive sacroiliac joint fusion for chronic sacroiliac joint pain: a systematic review. PubMed. https://pubmed.ncbi.nlm.nih.gov/35017057/. Date Accessed September 11, 2026.

Minimally invasive lateral, posterior, and posterolateral sacroiliac joint fusion for low back pain: a systematic review and meta-analysis. PubMed. https://pubmed.ncbi.nlm.nih.gov/39917851/. Date Accessed September 11, 2026.

The effect of minimally invasive sacroiliac joint fusion compared to sham operation: a double-blind randomized placebo-controlled trial. PubMed. https://pubmed.ncbi.nlm.nih.gov/38328752/. Date Accessed September 11, 2026.

Minimally Invasive SI Joint Fusion Procedures for Chronic SI Joint Pain: Systematic Review and Meta-Analysis of Safety and Efficacy. PubMed. https://pubmed.ncbi.nlm.nih.gov/37798076/. Date Accessed September 11, 2026.