Anterior Lumbar Interbody Fusion (ALIF) approaches the lumbar spine from the front of the abdomen, allowing placement of a large interbody cage that restores disc height, corrects sagittal alignment, and achieves high fusion rates. It is a powerful technique for treating degenerative disc disease, spondylolisthesis, and adjacent segment disease at the L4–L5 and L5–S1 levels.
What Is ALIF?
ALIF is performed through an incision in the lower abdomen, in collaboration with a vascular or general surgeon who provides safe access to the front of the lumbar spine. Unlike posterior approaches (TLIF, PLIF), the approach avoids the back muscles entirely — there is no retraction of the paraspinal musculature, which significantly reduces post-operative back muscle pain and allows excellent visibility of the disc space.
The entire disc is removed and a large lordotic cage — much bigger than what can be placed from the back — is filled with bone graft and implanted between the vertebrae. The larger footprint of the ALIF cage covers more of the vertebral endplate, providing superior mechanical support and a greater surface area for fusion. ALIF also allows precise restoration of lumbar lordosis, which is critical for maintaining proper spinal balance and reducing the risk of adjacent segment problems.
ALIF is frequently combined with posterior percutaneous pedicle screw fixation in the same surgical session, providing a 360-degree construct with excellent immediate stability. At L5–S1 in particular, ALIF is often the preferred interbody technique due to the favorable anatomy and the large cage size achievable from this approach.
Are You a Candidate?
- Patients with single or two-level lumbar degenerative disc disease at L4–L5 or L5–S1 causing disabling back and/or leg pain
- Patients with spondylolisthesis requiring reduction and stabilization at L5–S1
- Patients with adjacent segment disease above or below a prior posterior fusion
- Patients requiring significant lordosis correction for sagittal balance restoration
- Patients who have previously had posterior surgery and would benefit from an anterior approach to avoid scar tissue
- Patients who have failed conservative treatment including physical therapy, medications, and injections
What to Expect
Pre-operative: CT imaging is reviewed to assess vascular anatomy (the aorta and vena cava are immediately anterior to the spine). MRI confirms disc-level pathology. A vascular or general surgery colleague is involved in pre-operative planning.
Day of surgery: The procedure takes 2–4 hours depending on levels. An incision is made in the lower abdomen or flank. After cage placement, percutaneous posterior screws may be placed in the same session. Hospital stay is typically 1–2 nights.
First 4 weeks: Patients are walking immediately. Abdominal soreness is expected for 2–3 weeks. Activity restrictions include no heavy lifting, bending, or twisting. Rare risks specific to the anterior approach include retrograde ejaculation and vascular injury — both are discussed in detail at the pre-operative consultation.
3–6 months: Most patients return to desk work within 2–4 weeks. Serial X-rays confirm fusion progression. Physical therapy begins at 6–8 weeks. High fusion rates at L5–S1 (95%+) make ALIF one of the most reliable lumbar fusion techniques.
Why Choose Dr. Chavarria for Your ALIF in Reno?
- No retraction of back muscles — less post-operative muscle pain
- Largest cage placement of any lumbar interbody technique — maximizes fusion surface area
- Superior lordosis correction — restores lumbar curve and spinal balance
- Very high fusion rates, particularly at L5–S1
- Avoids posterior scar tissue in revision cases
- Can be combined with posterior fixation for a 360-degree construct in a single surgery