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What TLIF Accomplishes — and the Anatomy That Requires It

Transforaminal lumbar interbody fusion is a posterior lumbar fusion technique that accesses the disc space from a posterolateral angle — through the foramen, on one side — to place an interbody cage packed with bone graft into the cleared disc space. Pedicle screws and rods secure the segment. The combined construct stabilizes the level, allows the disc space to fuse, and decompresses the nerve roots as part of the same procedure. The anatomical indication for TLIF is segmental instability — a level that is not simply arthritic or painful but is actively moving in ways that are pathological and causing nerve compression or progressive deformity. The most common diagnosis is degenerative spondylolisthesis: a forward slippage of one vertebra on the next, driven by facet joint degeneration and disc space collapse, that produces canal narrowing and nerve root compression that cannot be adequately or durably addressed by decompression alone.

Other indications include isthmic spondylolisthesis, recurrent disc herniation at a previously operated level, and degenerative disc disease with confirmed segmental instability on dynamic imaging. What TLIF does not accomplish is the elimination of all back pain, the prevention of adjacent-level degeneration over a long enough timeline, or the restoration of the spine to a pre-degenerative state. We are precise about this with every Mullica Hill patient because the patients who recover best from fusion are those who understood exactly what they were agreeing to before they went to the operating room.

Who Is a TLIF Candidate at Mullica Hill — and What the Evaluation Involves

The typical Mullica Hill patient for whom we consider TLIF has been managing lumbar spine disease for a meaningful period — often through the Inspira care network — with conservative measures: physical therapy, epidural injections, anti-inflammatory medications. When those measures are no longer providing adequate relief and the imaging demonstrates structural instability at a specific level, the conversation about fusion becomes relevant.

Evaluation for TLIF includes standard MRI to characterize disc and facet pathology, standing lumbar radiographs to assess alignment and measure spondylolisthesis grade, and in selected patients, dynamic flexion-extension X-rays to confirm instability. We are looking for the specific level where the structural problem is concentrated — because targeted fusion of that level is the correct treatment, while fusion of levels that are not unstable is not indicated and adds physiological burden without clinical benefit.

For patients with medical complexity — conditions common in this age group including cardiovascular disease, diabetes, and obesity — the Inspira network's capacity for coordinated perioperative management is practically valuable. Pre-operative medical optimization, intraoperative anesthesia management, and post-operative hospitalist or specialist availability are all factors in a procedure of this magnitude.

Recovery, Rehabilitation, and What Fusion Means Long-Term

TLIF is performed at Inspira Medical Center Mullica Hill and requires an inpatient stay of one to two nights in most cases. Early mobilization — standing and walking the day of or the day after surgery — is a priority, as prolonged immobility after lumbar fusion is associated with worse outcomes. Physical therapy begins in the hospital and continues as an outpatient program, with Inspira rehabilitation services available for patients who prefer to keep their recovery within the same network. The fusion itself — the biological process by which the bone graft consolidates and the segment becomes solid — takes three to six months for early structural maturity and up to twelve to eighteen months for complete consolidation. Patients feel substantially better within weeks of surgery as the instability and nerve compression are resolved, but the structural healing continues well past that point. Activity restrictions are graduated based on fusion maturity and clinical progress. Long-term, fused segments are permanent. The treated level does not move. Adjacent levels above and below the fusion do bear an increased load, and over years, some patients develop adjacent segment disease — degeneration at the levels next to the fusion. This is a known and accepted consideration, and we discuss it as part of the pre-operative conversation so that patients are making a fully informed decision about the trade-offs of lumbar fusion.

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Your Surgical Team at POA Mullica Hill

Rahul V. Shah

Dr. Rahul V. Shah, MD, FAAOS

Board-Certified Orthopaedic Spine Surgeon  |  Fellowship-Trained, UCSF  |  Chief Resident, Yale

Dr. Shah is precise about TLIF indication because the precision matters. His UCSF training emphasized that lumbar fusion produces excellent outcomes in the right patients — and less predictable outcomes when it is applied to patients whose primary problem is not segmental instability. At Mullica Hill, his approach is to identify the specific structural problem at the specific level that is responsible for the patient's symptoms, confirm it on imaging, and then have a direct conversation about what fusion will accomplish and what the patient's life looks like on the other side of it. That clarity — about indication, about expectation, about what surgery is and is not going to fix — is the foundation of how he practices.

  • FAAOS — Fellow, American Academy of Orthopaedic Surgeons
  • Spine Surgery Fellowship — University of California, San Francisco
  • Chief Resident — Yale University Orthopaedic Surgery
  • Faculty — Rowan University Medical School

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Joseph R. Zerbo male in white lab coat

Dr. Joseph R. Zerbo, DO

Board-Certified Orthopaedic Spine Surgeon  |  NASS Member  |  35+ Years in Southern NJ

Dr. Zerbo has watched lumbar fusion evolve over more than three decades of practice. His NASS membership gives him ongoing access to the research base on fusion outcomes, adjacent segment considerations, and patient selection, and his D.O. training gives him a whole-person framework for thinking about what fusion means to a patient's life over a long horizon. For Mullica Hill patients considering TLIF after years of managing their spine through the Inspira system, he brings both the technical expertise to perform the surgery well and the long-term perspective to have an honest conversation about what choosing fusion means for everything that comes after.

  • AOBOS Board-Certified — American Osteopathic Board of Orthopaedic Surgeons
  • NASS Member — North American Spine Society (since 1999)
  • Chief Resident — Kennedy Memorial Hospital / UMDNJ
  • Founder — Zerbo Spine, PA

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TLIF FAQs

I've had multiple epidural injections and physical therapy over several years — does that mean TLIF is the right next step?

Will TLIF eliminate my back pain entirely?

What is my recovery at home after TLIF?

What is adjacent segment disease and should it change my decision about fusion?

I've had multiple epidural injections and physical therapy over several years — does that mean TLIF is the right next step?

Having exhausted conservative measures is one part of the indication for fusion — but not the only part. The other part is demonstrating structural instability at a specific level on imaging. Some patients who have been through years of conservative management have a mobile, unstable segment on imaging that clearly requires stabilization; others have diffuse degenerative disease without concentrated instability. The evaluation at our Mullica Hill office is designed to determine which situation applies to you, so that a recommendation for TLIF is based on the anatomy, not just the treatment history.

Will TLIF eliminate my back pain entirely?

TLIF is designed to eliminate the instability that is causing structural nerve compression and the pain associated with an abnormally moving segment. Most patients experience significant back and leg pain improvement after TLIF. However, chronic back pain that has been present for years often has components that are not solely attributable to the unstable segment — deconditioning, sensitization of the pain pathway, muscular dysfunction. TLIF addresses the structural problem; the other components of chronic pain are addressed through rehabilitation and activity restoration. We are direct about this distinction with every patient.

What is my recovery at home after TLIF?

Most patients are discharged one to two days after surgery and return home with activity restrictions. For the first six weeks, lifting is limited and prolonged sitting is restricted. Physical therapy — available through Inspira's rehabilitation services if you prefer — begins within a few weeks and focuses on core strengthening and graduated activity restoration. By three months, most patients have returned to light activity; more demanding activity is evaluated based on imaging evidence of fusion progress and clinical symptoms.

What is adjacent segment disease and should it change my decision about fusion?

Adjacent segment disease refers to the accelerated degeneration that can develop at the spinal levels immediately above and below a fusion over the years following surgery. Because the fused level no longer moves, the neighboring levels absorb more motion and load, which can accelerate their own degenerative progression. This is a real consideration and one we discuss openly. Whether it changes the decision depends on the patient's specific anatomy, age, and activity expectations. For patients with severe instability and functional disability, the benefits of fusion outweigh the long-term adjacent segment risk — but that is a conversation that should happen before the operation, not after.

Premier Orthopaedic Associates Mullica Hill - Inspira Hospital

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(856) 690-1616

Location Address

698 Mullica Hill Road, Suite 150
Mullica Hill, NJ 08062

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MON — FRI: 8:30AM - 5PM

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