Lumbar Spinal Fusion
Surgery to permanently stabilize the lumbar spine by joining two or more vertebrae
Lumbar spinal fusion is a surgical procedure that permanently joins two or more vertebrae in the lower back, eliminating motion between them. It is used to treat conditions where spinal instability, severe disc degeneration, or spondylolisthesis is causing disabling pain or neurological problems. There are several approaches — PLIF (posterior lumbar interbody fusion), TLIF (transforaminal lumbar interbody fusion), and ALIF (anterior lumbar interbody fusion) — each with specific indications. Fusion is often combined with laminectomy or discectomy to simultaneously decompress nerves.
Who Is a Candidate?
- Spondylolisthesis (vertebral slippage) causing back and/or leg pain with instability
- Severe degenerative disc disease causing disabling axial back pain unresponsive to conservative care
- Recurrent disc herniation at the same level requiring additional surgery
- Lumbar spinal stenosis with coexisting spinal instability
- Lumbar deformity (degenerative scoliosis) causing nerve compression or balance problems
- Fracture or tumor requiring spinal stabilization
What to Expect
1Before Surgery
Pre-operative evaluation includes MRI, CT scan, and standing X-rays to assess alignment and instability. Stopping smoking is strongly encouraged as it significantly impairs bone fusion. Pre-operative physical therapy (prehabilitation) can improve outcomes. Blood thinners and NSAIDs are stopped before surgery. General anesthesia is required; hospital stay is typically 2–4 days.
2The Procedure
In TLIF (the most common approach), the surgeon makes an incision in the back and removes the disc between the affected vertebrae. A bone graft or synthetic cage filled with bone material is placed in the disc space to restore height and allow fusion. Pedicle screws and rods are inserted into the vertebrae above and below to hold them in position while the bone heals. For ALIF, an incision is made in the abdomen to access the disc from the front. The procedure typically takes 2–4 hours for a single level.
3Recovery
Walking begins the day after surgery. Most patients are discharged in 2–4 days. Light activity resumes in 4–6 weeks; desk work in 6–8 weeks; physical labor in 3–6 months. A back brace is often worn for 6–12 weeks. Physical therapy begins at 6–8 weeks. Fusion is confirmed by CT scan at 6–12 months. Full recovery can take 6–18 months.
Typical Outcomes
Outcomes for lumbar fusion depend heavily on the indication. For spondylolisthesis, fusion provides excellent pain relief and stability in 80–90% of patients. For degenerative disc disease (axial back pain), outcomes are more variable — fusion improves quality of life in well-selected patients but is less predictable than for structural instability. Success is strongly influenced by smoking cessation, pre-operative functional status, and patient selection.
Risks & Considerations
- Non-fusion (pseudarthrosis) — occurs in 5–20% of cases, more common in smokers, osteoporosis, or multilevel procedures
- Adjacent segment disease — degeneration at levels above/below the fusion
- Hardware failure — screw or rod breakage (rare)
- Infection — 1–2% for posterior approaches
- Nerve injury or dural tear
- Blood clots (DVT/PE) — reduced with early ambulation and blood thinners
- Retrograde ejaculation (specific risk of ALIF approach in men)
Frequently Asked Questions
What is the difference between PLIF, TLIF, and ALIF?
All three are lumbar interbody fusion techniques — they place a spacer in the disc space to restore height and facilitate fusion. PLIF accesses the disc from directly behind the spine; TLIF approaches at an angle from the side, requiring less nerve retraction (lower nerve injury risk); ALIF approaches from the front of the body, providing excellent disc space access and lordosis restoration but requiring general surgical and vascular assistance. TLIF is currently the most commonly performed interbody fusion approach.
How long does it take for lumbar fusion to fully heal?
Bone fusion is a biological process that takes a minimum of 3 months and often 6–12 months to complete. CT scan at 6–12 months is typically used to confirm solid fusion. Most patients feel substantially better at 3–6 months even before fusion is radiographically confirmed. Full return to unrestricted activity generally takes 6–12 months.
Can I avoid lumbar fusion with a different surgery?
Fusion is not the only option for all conditions. Laminectomy alone may be appropriate for stenosis without instability. Microdiscectomy addresses disc herniations without fusion. Lumbar disc replacement (arthroplasty) is an option for selected younger patients with isolated disc disease and no significant facet arthritis. Whether fusion is necessary depends on whether spinal instability is a component of your condition.
Does lumbar fusion increase my risk of problems at other levels?
Yes — this is called adjacent segment disease. When one level is fused, the adjacent levels must bear more stress during movement. Studies show approximately 25–30% of patients develop symptomatic adjacent segment disease within 10 years, though not all require additional surgery. Minimizing the number of fused levels and maintaining core strength may reduce adjacent segment stress.
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Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with any questions you may have regarding a medical condition or surgical procedure. Last reviewed March 2026. CPT: 22612.