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Spondylolisthesis

Forward slippage of one vertebra over another — a common source of lower back pain

ICD-10: M43.1 · lumbar condition

Spondylolisthesis occurs when one vertebra slides forward (or less commonly backward) over the one below it. It is graded I through IV based on the percentage of slip. Grade I and II slips are most common and usually managed without surgery. Grade III and IV slips — or lower-grade slips with significant nerve compression — may require surgical stabilization. The most common type in adults is degenerative spondylolisthesis, which most frequently affects the L4-L5 level.

5–6%

Spondylolisthesis affects approximately 5–6% of the adult population, with the L4–L5 and L5–S1 levels most commonly involved.

American Academy of Orthopaedic Surgeons

80%

Approximately 80% of patients with Grade I or II spondylolisthesis can be managed effectively without surgery through physical therapy and activity modification.

North American Spine Society

66%

The SPORT trial showed surgery for degenerative spondylolisthesis produced significantly greater improvement than non-operative treatment in 66% of patients at 2-year follow-up.

Weinstein JN et al., New England Journal of Medicine (2007)

Classification

Degenerative (Type III / Meyerding)

Most common type in adults

Facet joint degeneration and disc height loss allow anterior vertebral slippage without a pars defect; most commonly at L4-L5 in adults over 50; frequently associated with central or lateral recess stenosis and neurogenic claudication

Isthmic / Spondylolytic (Type II / Meyerding)

Most common in adolescents and young adults; athletes at elevated risk

A defect or stress fracture in the pars interarticularis (spondylolysis) allows forward slip of the vertebral body; most common in young athletes and at the L5-S1 level; may be asymptomatic or cause low back pain and L5 radiculopathy

Congenital / Dysplastic (Type I)

Rare; pediatric presentation

Sacral or posterior arch dysplasia allows forward slip without a pars defect; often associated with spina bifida occulta; may present with significant slip at a young age

Traumatic (Type IV)

Rare; high-energy mechanism

Acute fracture of posterior elements other than the pars (facet, pedicle, or lamina) following high-energy trauma allows acute vertebral slippage

Symptoms

  • Lower back pain, often worse with prolonged standing or walking
  • Buttock pain radiating into the legs (neurogenic claudication)
  • Numbness or tingling in one or both legs
  • Tight hamstrings (a common early sign in adolescents)
  • Visible abnormality in posture or gait in severe cases
  • Bladder or bowel dysfunction in severe, high-grade slips

Causes & Risk Factors

  • Degenerative — wear to the facet joints allowing forward slip (most common in adults over 50)
  • Isthmic — stress fracture of the pars interarticularis (common in young athletes)
  • Traumatic — acute injury causing vertebral displacement
  • Pathological — bone disease (e.g., osteoporosis, tumor) weakening the posterior arch
  • Iatrogenic — post-surgical instability following laminectomy

Imaging Findings

Imaging studies are commonly used to identify findings associated with this condition. Results vary by individual; a qualified spine specialist interprets findings in the context of a full clinical evaluation.

MRI

  • Sagittal T2 sequences show forward displacement of one vertebral body relative to the one below; foraminal stenosis and nerve root impingement are well-characterised on coronal oblique views
  • Disc degeneration at the spondylolisthetic level is typically advanced; MRI evaluates associated disc herniation, canal narrowing, and nerve root compression
  • For isthmic spondylolisthesis, the pars interarticularis defect (spondylolysis) may be visible on MRI but CT or SPECT is more sensitive for acute lesions
  • Dynamic instability (increased slip on standing vs. supine MRI) may change surgical planning — results vary by individual and require specialist interpretation

CT Scan

  • CT is the gold standard for identifying pars interarticularis defects (spondylolysis) — the collar sign on oblique reconstructions is a hallmark of isthmic disease
  • Bony canal and foraminal dimensions, osteophyte morphology, and facet joint degeneration are best quantified on CT
  • CT myelogram is useful for surgical planning when MRI is contraindicated

X-Ray

  • Standing lateral radiograph is the standard for grading slip percentage (Meyerding I-V); a standing film reflects the true functional displacement better than supine MRI
  • Flexion-extension lateral views quantify dynamic instability — a slip increase >3-4 mm indicates segmental instability relevant to fusion planning
  • Oblique views (Scotty dog silhouette) can identify pars defects, though CT is more sensitive and specific

Who Is Commonly Affected

The following patterns are commonly associated with this condition based on published population studies. Individual presentation varies; these figures are informational only.

Peak Age Range

Isthmic spondylolisthesis: most commonly identified in adolescent athletes and young adults (ages 10-25); degenerative spondylolisthesis: predominates in adults over 50

Gender Distribution

Isthmic: more common in males (male-to-female ratio approximately 2:1); degenerative: more common in females (female-to-male ratio approximately 3:1 over age 50)

Estimated Prevalence

Radiographic lumbar spondylolisthesis found in approximately 6-11% of adults in population imaging studies; prevalence increases with age from under 5% before age 50 to 20-30% in adults over 70; based on published population studies, individual presentation varies

Treatment Options

Conservative

  • Physical therapy focused on core stabilization and lumbar extension exercises
  • Activity modification — avoiding high-impact and hyperextension activities
  • Anti-inflammatory medications and epidural steroid injections
  • Bracing in selected cases, especially for isthmic spondylolisthesis in adolescents
  • Weight management to reduce mechanical loading

Surgical

  • Posterior lumbar interbody fusion (PLIF) or TLIF — most common surgical approach
  • Posterolateral fusion with pedicle screw fixation
  • Minimally invasive MIS-TLIF for reduced recovery time
  • Reduction of high-grade slips combined with fusion (specialized cases)

Treatment Pathway

1

Conservative Care

Physical therapy focusing on lumbar stabilization, core strengthening, and reduction of shear forces across the slip level. Activity modification and bracing may be used in the acute phase, particularly for isthmic spondylolisthesis in young athletes.

  • Lumbar stabilization and core strengthening program
  • Activity restriction or bracing (acute isthmic spondylolysis in adolescents)
  • NSAIDs for symptom management
2

Interventional Management (if needed)

Epidural steroid injections for radicular leg pain from concurrent stenosis or nerve root compression. Diagnostic medial branch blocks if facet-related axial pain is suspected.

  • Epidural steroid injection for radiculopathy
  • Medial branch block if facetogenic pain is the primary generator
3

Surgical Stabilization

Decompression with posterolateral fusion is the standard surgical approach for symptomatic degenerative spondylolisthesis with neurological symptoms failing conservative care. Reduction of the slip is performed selectively based on severity and surgeon preference.

  • Posterolateral instrumented fusion with or without decompression (PLIF / TLIF / PLF)
  • Minimally invasive TLIF for appropriate candidates
  • Pars repair (for active young patients with isthmic spondylolysis and preserved disc height)

Conservative Care — What to Expect Without Surgery

Grade I and II spondylolisthesis without neurologic symptoms commonly responds to conservative care. Structured physical therapy focusing on core and spinal stabilization is the primary non-surgical intervention, with strong evidence for functional improvement in patients without significant nerve compression.

NASS Clinical Guidelines — Degenerative Lumbar Spondylolisthesis

Conservative Treatment Options

Physical Therapy (Stabilization)(6–12 weeks)

Lumbar stabilization exercises are the cornerstone of conservative spondylolisthesis care — they reduce pain and improve function in mild-to-moderate slips.

Activity Modification(Ongoing)

Avoiding hyperextension activities (gymnastics, high-impact sports) that stress the pars interarticularis.

NSAIDs(2–4 weeks)

Short-course anti-inflammatories for acute pain flares.

Epidural or Facet Injections(Up to 3 per year)

For spondylolisthesis with associated radiculopathy or facet pain, targeted injections can provide meaningful relief.

When Is Surgery Typically Considered?

Surgical fusion is typically considered for symptomatic Grade II or higher slips with neurologic compromise, or when conservative care has failed to control pain over 3–6 months with documented functional impairment.

Red Flags — Seek Urgent Care

  • Progressive leg weakness or bowel/bladder changes — seek same-day evaluation
  • High-grade slip (Grade III+) with new neurologic symptoms — seek urgent surgical evaluation
Should you get a second opinion? Which specialist treats this?

When to see a spine specialist

See a spine specialist if low back pain is persistent, especially if it radiates into the legs or is accompanied by weakness. Athletes with low back pain lasting more than 2 weeks that doesn't improve should be evaluated for isthmic spondylolisthesis.

Specialists Who Treat Spondylolisthesis

Dr. Jesuel Padro-guzman

New York, NY

Dr. Nora Cubillos

San Antonio, TX

Dr. Ben Strickland

Los Angeles, CA

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Prognosis

The following factors are commonly associated with recovery outcomes for this condition based on published literature. Individual outcomes vary and depend on many clinical factors.

Prognosis Factors

Favorable

  • Low-grade slip (Meyerding Grade I–II: <50% translation) with stable radiographic measurements over time
  • Absence of significant neurological deficit before surgical intervention
  • Young age and good bone quality supporting solid arthrodesis
  • Isthmic spondylolisthesis with preserved disc height is more amenable to motion-preserving or repair approaches

Unfavorable

  • High-grade slip (Meyerding Grade III–IV: >50% translation) with significant sagittal imbalance
  • Multilevel degenerative disease requiring extensive fusion, increasing adjacent-segment stress
  • Medical comorbidities — osteoporosis, diabetes, obesity — that increase fusion failure risk
  • Progressive neurological deficit indicating evolving cord or cauda equina compromise

Questions to Ask Your Doctor

Bring these questions to your next appointment about spondylolisthesis.

  1. 1

    Is my spondylolisthesis degenerative, isthmic (pars fracture), or another type — and does the underlying cause change which treatments are most likely to help?

  2. 2

    What grade is my slip (I through V on the Meyerding scale) — and at what grade does surgery typically become the recommended approach?

  3. 3

    Which of my symptoms — back pain, leg pain, or neurological symptoms — is most likely driven by the spondylolisthesis versus other degenerative changes at the same level?

  4. 4

    If surgery is recommended, would a decompression alone be sufficient, or would stabilisation (fusion) also be needed given my slip degree and instability?

  5. 5

    Are there activity modifications — such as avoiding hyperextension movements — that are well-supported by evidence for my type of spondylolisthesis?

Research Evidence

18 studies reviewed · sorted by Spine.co trust score

Researchers found associations between these studies and this condition — this is not a diagnosis or treatment recommendation. Spine.co trust scores reflect methodological quality only. Always consult a qualified spine specialist.

Frequently Asked Questions

Can spondylolisthesis get worse over time?

Low-grade slips (Grade I and II) often remain stable for years. However, especially in degenerative spondylolisthesis, the slip can slowly progress over decades. Regular monitoring with periodic X-rays helps track progression. Rapid progression or worsening neurological symptoms warrant more urgent evaluation.

Is spondylolisthesis the same as spondylolysis?

No, though they are related. Spondylolysis is a stress fracture of the pars interarticularis — a small bone bridge connecting the upper and lower joints of a vertebra. It does not involve vertebral slippage. When this fracture causes the vertebra to slide forward, that is called isthmic spondylolisthesis.

What percentage of people with spondylolisthesis need surgery?

The majority — roughly 80% — of patients with spondylolisthesis (especially Grade I and II) can be managed effectively without surgery. Surgery is considered when conservative care fails after 3–6 months, when there is neurological deficit (weakness or bowel/bladder changes), or when the slip is high-grade (III or IV).

Related Procedures

Lumbar Spinal FusionLaminectomy

Related Conditions

Lumbar Spinal StenosisDegenerative Disc DiseaseChronic Back Pain

This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider for diagnosis and treatment decisions. ICD-10: M43.1.