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What Is Extreme Lateral Interbody Fusion?

Extreme lateral interbody fusion is a lumbar fusion procedure that reaches the spine through the patient's side and passes through the psoas muscle to access the disc space. It is commonly abbreviated XLIF and belongs to the family of lateral transpsoas interbody-fusion techniques. The surgeon removes the diseased disc and places a large interbody cage with bone-graft material between adjacent vertebral bodies. The procedure can restore disc height and alignment and can produce indirect decompression by enlarging the space available for compressed nerves.

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What Is Extreme Lateral Interbody Fusion?

Extreme lateral interbody fusion is a lumbar fusion procedure that reaches the spine through the patient's side and passes through the psoas muscle to access the disc space. It is commonly abbreviated XLIF and belongs to the family of lateral transpsoas interbody-fusion techniques. The surgeon removes the diseased disc and places a large interbody cage with bone-graft material between adjacent vertebral bodies. The procedure can restore disc height and alignment and can produce indirect decompression by enlarging the space available for compressed nerves.

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Why Is Extreme Lateral Interbody Fusion Performed?

XLIF is used for selected patients with degenerative disc disease, spondylolisthesis, adult spinal deformity, foraminal stenosis, or instability that requires interbody fusion. It can be useful when correction of disc height or spinal alignment is needed without a traditional anterior abdominal exposure or extensive posterior muscle dissection. The technique is generally used for lumbar levels that can be reached safely from the side, while L5-S1 is usually difficult to access because of the iliac crest and surrounding anatomy. Patient selection depends on spinal level, deformity, nerve compression, psoas and vascular anatomy, bone quality, and the need for direct versus indirect decompression.

How Is Extreme Lateral Interbody Fusion Performed?

The patient is positioned on the side, and imaging is used to identify the target disc level. The surgeon makes a small flank incision and dilates a working corridor through the psoas muscle while neuromonitoring helps identify nearby lumbar plexus nerves. The disc is removed, the endplates are prepared, and a wide interbody cage containing graft material is placed across the disc space. Supplemental screws and rods are often added from the back or side to improve stability while fusion develops.

What Is Recovery Like After Extreme Lateral Interbody Fusion?

Walking usually begins soon after surgery as pain and neurologic status allow. Temporary thigh soreness, numbness, or hip-flexor weakness can occur because the approach passes through the psoas muscle near the lumbar plexus. Bending, heavy lifting, twisting, and high-impact exercise are limited while the fusion begins to heal. Follow-up imaging is used over the following months to assess cage position, alignment, hardware, and development of solid fusion.

What Are the Risks and Complications?

Neurologic complications are a major consideration because the lumbar plexus runs within the psoas muscle used for the surgical corridor. Patients can develop temporary or persistent anterior-thigh pain, numbness, hip-flexor weakness, or injury to femoral or other lumbar plexus nerves. Other risks include infection, bleeding, bowel or vascular injury, cage subsidence, malposition, pseudarthrosis, and failure of indirect decompression. Some patients require additional posterior decompression or revision surgery when symptoms persist or the fusion construct fails.

Frequently Asked Questions About Extreme Lateral Interbody Fusion

What does XLIF stand for?

XLIF stands for extreme lateral interbody fusion, a lumbar fusion technique that reaches the disc through a lateral transpsoas approach.

Why can thigh numbness occur after XLIF?

The surgical corridor passes through the psoas muscle near the lumbar plexus, so temporary irritation of sensory or motor nerves can cause thigh symptoms.

Can XLIF be performed at L5-S1?

Usually not through a standard transpsoas route because the iliac crest and regional anatomy often block safe lateral access to the L5-S1 disc space.

Does XLIF always require screws?

Not always, but supplemental fixation with screws or other implants is commonly added when greater stability is needed for the planned fusion.

References

The lateral transpsoas approach to the lumbar and thoracic spine: A review. PubMed. https://pubmed.ncbi.nlm.nih.gov/22905326/. Date Accessed September 11, 2026.

Extreme lateral interbody fusion (XLIF): how I do it. PubMed. https://pubmed.ncbi.nlm.nih.gov/25358971/. Date Accessed September 11, 2026.

Extreme lateral interbody fusion. Indication, surgical technique, outcomes and specific complications. PubMed. https://pubmed.ncbi.nlm.nih.gov/25586505/. Date Accessed September 11, 2026.

Review of Risks and Complications of Extreme Lateral Interbody Fusion (XLIF). PubMed. https://pubmed.ncbi.nlm.nih.gov/31893138/. Date Accessed September 11, 2026.

Neuromonitoring in Lateral Approaches for Lumbar Interbody Fusion: A Systematic Review. PubMed. https://pubmed.ncbi.nlm.nih.gov/36243359/. Date Accessed September 11, 2026.