Lumbar Disc Replacement Surgery New York City | Dr. Zeeshan Sardar

Dr. Zeeshan Sardar, MD, MSc, F.R.C.S.C
Director, Quality & Patient Safety (QPS) – Och Spine Hospital
Medical Director, Spine Unit – Och Spine Hospital
Co-Chief of Spinal Deformity Surgery • NewYork-Presbyterian / Columbia University
Och Spine Hospital • New York, NY

For most of the history of modern spine surgery, lumbar fusion was the only surgical option for patients with symptomatic lumbar disc disease. Fusion reliably addresses the painful, degenerated disc — but it does so by eliminating motion at the treated level entirely. The adjacent discs above and below must then absorb mechanical loads they were never designed to carry alone, accelerating their degeneration and increasing the likelihood of future problems at those levels.

Lumbar disc replacement — also called lumbar total disc replacement (TDR) or lumbar arthroplasty — offers a motion-preserving alternative. The degenerated disc is removed and replaced with an artificial implant that replicates the disc’s function, decompressing the nerve or relieving discogenic pain while preserving movement at the treated level.

Dr. Sardar completed a dedicated fellowship in artificial disc replacement at the Texas Back Institute — one of the founding centers for lumbar disc replacement technology in North America, where the procedure was among the first performed in the United States as part of the FDA approval trial for the Charité disc. This background gives him a clinical and technical foundation for lumbar disc replacement that most spine surgeons, even experienced ones, do not have. He evaluates every patient individually and recommends fusion or disc replacement based solely on what best fits that patient’s anatomy, pathology, and goals.

WHAT IS LUMBAR DISC REPLACEMENT?

Lumbar disc replacement is a procedure in which a degenerated lumbar disc is surgically removed and replaced with an artificial disc implant. Like lumbar fusion, it is performed through an anterior (abdominal) approach — through the front of the body rather than the back — allowing complete removal of the disc and decompression of the affected nerve roots or relief of discogenic pain. Unlike fusion, the disc space is not packed with bone graft and locked in place. Instead, an implant is placed that allows continued motion at the treated level.

Modern lumbar disc replacement implants are FDA-approved and engineered to replicate the normal biomechanics of a healthy lumbar disc, including both motion and load transfer. They are made from materials proven in joint replacement surgery — typically cobalt-chrome alloy with a polyethylene bearing surface.

The FDA-approved lumbar disc replacement systems currently in use include the Prodisc-L (Centinel Spine), Charité (DePuy), activL (Aesculap), and the Maverick (Medtronic), among others. These devices use different bearing designs — mobile-core versus fixed-core configurations — and differ in their footprint, height options, and approach requirements. The selection of the appropriate device for a specific patient is part of the preoperative planning process.

CONDITIONS TREATED

Lumbar disc replacement is used to treat symptomatic lumbar disc disease at one or two levels that has not responded to conservative management. Appropriate indications include:

  • Degenerative disc disease (DDD) — disc degeneration causing chronic lower back pain that is clearly disc-related (discogenic pain), confirmed by imaging and clinical evaluation
  • Lumbar disc herniation with radiculopathy — a herniated lumbar disc causing nerve root compression with leg pain, numbness, or weakness; disc replacement addresses both the source of pain and the nerve compression while preserving motion
  • Recurrent disc herniation — in selected patients who have had a prior discectomy and have re-herniated at the same level, disc replacement may offer a definitive solution while preserving motion

Not every patient with lumbar disc disease is a candidate. The selection criteria are specific, and imaging review is essential before recommending disc replacement over fusion.

LUMBAR DISC REPLACEMENT VS. FUSION

Both procedures remove the degenerated disc through an anterior approach and achieve equivalent rates of pain relief for appropriately selected patients. The fundamental difference lies in what happens to the treated level — and to the adjacent levels — over the years that follow.

Lumbar Fusion (ALIF / TLIF)

  • Disc removed, space filled with bone graft or cage
  • Treated level becomes permanently immobile
  • Adjacent levels absorb increased mechanical stress
  • Risk of adjacent segment disease over years to decades
  • Higher rates of reoperation at adjacent levels long-term
  • Appropriate for instability, deformity, spondylolisthesis, multilevel disease

Lumbar Disc Replacement (TDR)

  • Disc removed, replaced with motion-preserving implant
  • Treated level retains flexion, extension, and rotation
  • Normal biomechanical load distribution maintained
  • Reduced stress on adjacent levels
  • Lower rates of adjacent segment reoperation in clinical trials
  • Appropriate for selected patients without instability, significant facet arthritis, or deformity

WHO IS A CANDIDATE?

Lumbar disc replacement is appropriate for a carefully selected subset of patients with lumbar disc disease. Ideal candidates generally meet the following criteria:

  • Symptomatic disc disease at one or two levels (L3–S1) causing back pain, leg pain, or both
  • Failure of at least 6 weeks of appropriate conservative treatment (physical therapy, medications, injections) — except in cases of progressive neurological deficit
  • Preserved lumbar lordosis at the affected level — disc replacement is not appropriate in patients with kyphosis at the treated segment
  • No significant facet joint arthritis at the affected level — the facet joints must be functional to allow safe motion after disc replacement
  • No instability or spondylolisthesis at the affected level
  • No significant osteoporosis — adequate bone quality is required for implant fixation
  • Skeletally mature (growth complete)
  • No prior major abdominal surgery that would preclude the anterior approach (evaluated on a case-by-case basis)

Patients who do not meet these criteria — due to spondylolisthesis, significant facet arthritis, osteoporosis, multilevel degeneration, or deformity — are excellent candidates for lumbar fusion, which remains a highly effective procedure. Dr. Sardar will review your imaging carefully and give you a frank recommendation based on your specific anatomy.

THE EVIDENCE

Lumbar disc replacement is FDA-approved and supported by prospective randomized controlled trial data comparing it directly to lumbar fusion. Key findings from published clinical trials include:

  • Equivalent pain relief and functional outcomes — lumbar disc replacement achieves similar rates of back and leg pain improvement to lumbar fusion in appropriately selected patients
  • Lower adjacent segment reoperation rates — multiple trials have demonstrated statistically significant reductions in subsequent surgery at adjacent levels in patients treated with disc replacement versus fusion at 5–10 year follow-up
  • Preserved range of motion — functional motion is maintained at the treated level on long-term follow-up imaging in the majority of patients
  • Comparable safety profile — the complication rate of lumbar disc replacement is comparable to anterior lumbar fusion in trial data
  • High patient satisfaction — patient-reported outcomes at long-term follow-up are consistently favorable

L4–L5 VS. L5–S1: DOES THE LEVEL MATTER?

The two most common levels for lumbar disc replacement are L4–L5 and L5–S1, and they are not interchangeable. The level of disease directly affects the approach, the implant selection, and the candidacy assessment.

L4–L5

L4–L5 is generally considered a favorable level for disc replacement. Facet arthritis at L4–L5 can be more pronounced, however, particularly in older patients, making careful evaluation of facet health at this level especially important before recommending disc replacement over fusion.

L5–S1

L5–S1 is the most common level for degenerative disc disease and is also the most common level for lumbar disc replacement. Access is straightforward because the vessel bifurcation typically occurs above this level, giving good access to the disc. L5–S1 is often a better-preserved facet joint compared to L4–L5, making it the more frequently appropriate level for disc replacement. The main consideration at L5–S1 is that the natural lordosis at this level is significant — the implant must be matched to restore appropriate segmental lordosis, or the mechanical benefit of the device is compromised.

In patients with disease at both L4–L5 and L5–S1, two-level disc replacement may be considered in carefully selected cases, discussed in the section below.

TWO-LEVEL LUMBAR DISC REPLACEMENT

Single-level lumbar disc replacement is the standard and most well-studied configuration. Two-level lumbar disc replacement — replacing both L4–L5 and L5–S1 simultaneously — is FDA-approved and performed in appropriately selected patients, though with more demanding candidacy criteria than single-level surgery.

For a patient to be considered for two-level lumbar disc replacement, both levels must independently meet the candidacy criteria: symptomatic disease at each level, preserved facet joint health at each level, no instability or deformity, and adequate anterior access through a single approach window. A patient who qualifies at one level but not the other is not a candidate for two-level disc replacement — the second level would typically be fused instead.

Long-term data on two-level lumbar disc replacement are less extensive than for single-level, but published outcomes are favorable in appropriately selected patients. The procedure adds complexity to the access surgery but does not fundamentally change the recovery trajectory.

THE HYBRID CONSTRUCT: DISC REPLACEMENT ADJACENT TO PRIOR FUSION

One of the most clinically important — and least widely discussed — applications of lumbar disc replacement is the hybrid construct: placing a disc replacement at a level immediately adjacent to a prior lumbar fusion.

Adjacent segment disease — the development of new, symptomatic disc degeneration at the level above or below a prior fusion — is a well-documented consequence of lumbar fusion surgery. When it occurs, the adjacent level has traditionally been fused as well, extending the construct and compounding the motion loss. In carefully selected patients, however, disc replacement at the adjacent level is a viable alternative: it addresses the new symptomatic level while preserving motion, avoiding the cascade of extending the fusion construct by one more level.

Candidacy for a hybrid construct requires the same evaluation as any other disc replacement candidate — the adjacent level must have preserved facet health, no instability, and adequate bone quality. Scar tissue from the prior posterior surgery at the adjacent level must also be assessed. When these criteria are met, the hybrid construct is a well-described technique with favorable published outcomes at mid-term follow-up, and it represents exactly the kind of individualized decision-making that lumbar disc replacement expertise enables.

IF YOU WERE TOLD YOU DON’T QUALIFY — WHAT THAT MEANS AND WHAT TO DO

A significant number of patients who inquire about lumbar disc replacement have already been told by another surgeon that they are not a candidate. Understanding what that means — and whether it is definitively true — is worth a careful look.

The most common legitimate reasons a patient does not qualify for lumbar disc replacement:

  • Significant facet joint arthritis at the affected level — this is real and non-negotiable. A disc replacement preserves motion, but if the facet joints are arthritic, that motion will be painful rather than beneficial. Fusion is the appropriate treatment in this scenario.
  • Spondylolisthesis or instability — a disc replacement does not stabilize the spine. If there is a slip, fusion is needed.
  • Osteoporosis — the implant requires adequate bone quality to achieve secure fixation. Low bone density is a contraindication, though this may be amenable to preoperative treatment in selected cases.
  • Deformity or significant malalignment — patients with significant scoliosis, kyphosis, or global sagittal imbalance are not candidates. The mechanics of a disc replacement depend on a well-aligned spine.
  • Disease at more than two levels — multilevel disease affecting three or more levels makes disc replacement inappropriate at all affected levels.

However, patients are sometimes told they don’t qualify for reasons that deserve a second look — either because the surgeon performing the evaluation is less experienced with disc replacement (and therefore applies more conservative exclusion criteria), or because the imaging review was not sufficiently detailed. A second opinion from a surgeon with specific disc replacement fellowship training and high case volume is entirely appropriate when you have been told you don’t qualify and want to confirm that conclusion.

THE PROCEDURE

Lumbar disc replacement is performed under general anesthesia through an anterior (abdominal) incision. Because the lumbar spine sits in front of the spinal canal, approaching from the front provides direct, unobstructed access to the disc space without disturbing the posterior muscles or neural structures. The steps of the procedure are as follows:

  • A vascular surgeon or access surgeon assists with carefully exposing the front of the lumbar spine
  • The degenerated disc is completely removed and any bone spurs compressing the nerve roots are cleared
  • The disc space is prepared to precise dimensions using specialized instruments to ensure optimal implant fit and positioning
  • The artificial disc implant is inserted and seated within the disc space; intraoperative fluoroscopy confirms correct positioning
  • The abdomen is closed in layers; the incision is typically small and heals well

Intraoperative neuromonitoring is used throughout the procedure. Dr. Sardar works with an experienced vascular surgery team for the anterior access, ensuring the procedure is performed safely and efficiently.

WHAT TO EXPECT: RECOVERY

Recovery from lumbar disc replacement is generally comparable to recovery from anterior lumbar fusion — and in some respects faster, since there is no fusion to protect during the healing period.

  • Hospital stay: Most patients go home samde day or after one to two overnight stays.
  • Return to light activity and desk work: Typically 2–4 weeks.
  • Return to physical work or exercise: Usually 6–8 weeks, guided by Dr. Sardar’s post-operative protocol.
  • Driving: Typically cleared within 2–4 weeks once off narcotic pain medication and comfortable.
  • Motion: Unlike fusion, there is no waiting period for bone to heal before motion is allowed — the implant is stable from the time of insertion.
  • Long-term activity: Most patients return to full activity, including exercise and sport, once healed. Specific restrictions depend on the patient’s individual circumstances and are reviewed at each post-operative visit.

FREQUENTLY ASKED QUESTIONS

How is lumbar disc replacement different from cervical disc replacement?

The concept is the same — replace a degenerated disc with a motion-preserving implant — but the surgical approach and anatomy are different. Cervical disc replacement is performed through a small incision on the front of the neck. Lumbar disc replacement is performed through an abdominal incision, with assistance from a vascular surgeon to safely move the major blood vessels and access the lumbar spine. The candidacy criteria also differ, reflecting the different biomechanics and disease patterns of the cervical and lumbar spine.

Will the artificial disc wear out?

Modern lumbar disc implants are engineered for long-term durability, using materials proven in hip and knee replacement surgery. Long-term clinical trial data do not demonstrate significant wear-related failure at 10-year follow-up in the majority of patients. The implants are designed to last decades under normal physiological loading.

Can I have an MRI after lumbar disc replacement?

Yes. All FDA-approved lumbar disc replacement implants currently in use are MRI-compatible. There may be some imaging artifact near the implant, but MRI of the lumbar spine and adjacent levels can be safely performed after surgery.

What if I’ve already had lumbar surgery at that level?

Prior posterior surgery (such as a microdiscectomy or laminectomy) at the same level does not automatically exclude a patient from lumbar disc replacement, but it does require careful evaluation. Significant scar tissue near the nerve roots or disc space can affect the safety and feasibility of disc replacement. Dr. Sardar will review your prior operative records and imaging to determine whether disc replacement or fusion is the more appropriate option.

Is it better to replace the disc at L4–L5 or L5–S1?

Both levels are appropriate for disc replacement in well-selected patients. L5–S1 is the most common level for lumbar disc replacement and typically has straightforward vascular access. L4–L5 requires slightly more complex access, but is equally well-established. The decision is based on where your symptoms originate and which level meets candidacy criteria on imaging.

I was told I don’t qualify for disc replacement. Should I get a second opinion?

Yes, if you want to confirm that conclusion. The candidacy criteria for lumbar disc replacement are specific, and a surgeon with dedicated fellowship training and high case volume may assess the same imaging differently than a general spine surgeon who encounters this procedure infrequently.

Is lumbar disc replacement covered by insurance?

Coverage varies by insurer and plan. Lumbar disc replacement is FDA-approved and is covered by many major insurers for appropriately documented indications. Dr. Sardar’s team will work with you to obtain pre-authorization and clarify your coverage before scheduling surgery.

WHY CHOOSE DR. SARDAR FOR LUMBAR DISC REPLACEMENT

Lumbar disc replacement is a technically demanding procedure that requires specific fellowship training, an experienced anterior access team, and the clinical judgment to select the right patients. It is not a procedure that should be performed by surgeons who encounter it infrequently.

Dr. Sardar completed a dedicated fellowship in artificial disc replacement at the Texas Back Institute — one of the founding centers for this technology in North America, where the Charité disc was among the first placed in the United States during the FDA approval trial. His fellowship training, combined with additional programs in orthopedic and neurosurgical spine surgery and complex spinal deformity, gives him a uniquely comprehensive technical foundation for both cervical and lumbar disc replacement that most spine surgeons do not have from residency and general fellowship training alone.

He performs lumbar disc replacement as part of a broader motion-preserving spine surgery practice and is equally expert in lumbar fusion — meaning he recommends disc replacement only when it is genuinely the best option for that individual patient, never as a preference.

He operates at the Och Spine Hospital at NewYork-Presbyterian, where intraoperative neuromonitoring, advanced imaging, and an experienced vascular surgery team are available as standard for all anterior lumbar procedures.

Patients travel from across the United States and internationally to see Dr. Sardar for lumbar disc replacement. Telemedicine consultations are available for patients in NY, NJ, CT, FL, PA, MO, CA, and TX. International patients can contact NewYork-Presbyterian Global Services at +1-212-746-9100.

This page is for educational purposes only and does not constitute individualized medical advice. Please consult a qualified spine specialist to discuss your specific condition and treatment options.

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