LLIF Surgery in Miami
What Is Lateral Lumbar Interbody Fusion (LLIF)?
Lateral lumbar interbody fusion is a technique used to access the lumbar disc space through an incision in the patient’s side. The approach can be done through the psoas muscle or anterior to it.
The damaged disc is removed and replaced with an interbody implant containing bone-graft material. The implant may restore disc height, improve alignment, and create additional space around compressed nerves through indirect decompression. Screws, rods, or other supplemental fixation may also be used.
How Is LLIF Performed?
The procedure is performed under general anesthesia with the patient typically positioned on one side. The surgeon reaches the lumbar disc through a small lateral incision, using imaging and often neuromonitoring to help identify the appropriate pathway and protect nearby nerves.
Disc material is removed, the endplates are prepared, and an implant containing bone-graft material is placed into the disc space. Supplemental screws or rods may be placed during the same operation or through a separate approach when additional stability is needed. Not every lumbar level can be safely reached from the side, and patient anatomy may make another approach more appropriate.
Who May Be a Candidate?
Candidates may include selected patients with disc collapse, foraminal stenosis, degenerative scoliosis, adjacent-segment degeneration, spondylolisthesis, or certain spinal-alignment problems. The approach may be considered when restoring disc height or alignment could relieve symptoms and improve stability.
Candidacy depends on the spinal level, vascular and nerve anatomy, prior abdominal or retroperitoneal surgery, bone quality, alignment, and the location of nerve compression. The lowest lumbar level, L5–S1, is generally not approached using a standard transpsoas LLIF technique.
Potential Benefits
The lateral approach can provide access to a broad portion of the disc space without dissecting the posterior spinal muscles. A relatively wide implant may help restore disc height and support alignment. In selected patients, restoring disc height can enlarge the nerve openings through indirect decompression. Direct decompression may still be necessary when nerve compression is severe, fixed, or caused by material that cannot be adequately addressed indirectly.
Recovery
Patients are generally encouraged to begin walking soon after surgery. Temporary thigh discomfort, numbness, or hip-flexor weakness can occur and often improves with time, although persistent symptoms are possible. Activity is gradually advanced while fusion develops over several months.
FAQs
Q: Are LLIF, ATP (anterior to psoas) and transpoas the same procedure?
A: They all use a lateral approach to the lumbar disc space. LLIF is a broader category that may include several lateral techniques.
Q: Can every lumbar level be treated laterally?
A: No. Access depends on the ribs, pelvis, blood vessels, nerves, and other anatomical structures. L5–S1 usually requires a different approach.
Q: Does LLIF directly remove pressure from the nerves?
A: LLIF may provide indirect decompression by restoring disc height and enlarging the nerve openings. Some patients also require direct removal of tissue pressing on the nerves.
Q: Will additional screws be necessary?
A: Supplemental fixation is frequently used to support alignment and fusion. Whether it is required depends on spinal stability, bone quality, deformity, and the level being treated.