What Is Spondylolisthesis?
Spondylolisthesis is the anterior (anterolisthesis) or, more rarely, posterior (retrolisthesis) slippage of one vertebra in relation to the vertebra immediately below. The term derives from the Greek: "spondylos" (vertebra) and "olisthesis" (slippage).
The condition can be congenital, isthmic (pars interarticularis defect), degenerative, traumatic, or pathologic. The two most common types are isthmic spondylolisthesis — frequent in adolescents and young adults — and degenerative spondylolisthesis — predominant in women over 50.
Slippage is classified by the Meyerding system, which divides it into four grades based on the percentage of vertebral displacement over the vertebra below. Most symptomatic patients present with grade I or II (up to 50% slippage) and respond well to conservative treatment.
Vertebral Slippage
A vertebra slides forward (or backward) over the one below, potentially compressing nerve roots or causing instability.
Meyerding Classification
Grade I (0-25%), II (25-50%), III (50-75%), and IV (75-100%). Grade V = spondyloptosis (complete drop).
Two Main Types
Isthmic: pars interarticularis defect in young people. Degenerative: facet arthrosis with instability in older adults.
Epidemiology
Spondylolysis (a pars interarticularis defect, the precursor to isthmic spondylolisthesis) affects roughly 6% of the general population and is more frequent in men. In athletes who perform repetitive lumbar hyperextension — gymnasts, divers, wrestlers, and American football players — prevalence can reach 20-30%.
Degenerative spondylolisthesis is more prevalent in women (3:1 ratio), with peak incidence after age 50, predominantly affecting L4-L5. Isthmic spondylolisthesis is most common at L5-S1, accounting for 85% of isthmic cases.
TYPES OF SPONDYLOLISTHESIS
| TYPE | CAUSE | TYPICAL AGE | MOST COMMON LEVEL |
|---|---|---|---|
| Isthmic (Type II) | Defect (lysis) in the pars interarticularis | Adolescents and young adults | L5-S1 (85%) |
| Degenerative (Type III) | Facet arthrosis and instability | Over 50 years | L4-L5 (most frequent) |
| Dysplastic (Type I) | Congenital malformation of the pars or facets | Childhood and adolescence | L5-S1 |
| Traumatic (Type IV) | Acute fracture of the pars or pedicle | Any age | Variable |
| Pathologic (Type V) | Bone disease (tumor, infection, Paget) | Variable | Variable |
Pathophysiology
Understanding spondylolisthesis pathophysiology requires knowledge of the functional anatomy of the pars interarticularis and facet joints. The pars interarticularis is the region of the posterior vertebral arch between the superior and inferior articular processes — it functions as a structural "link" that maintains stability of the vertebral segment.
In isthmic spondylolisthesis, the primary mechanism is a pars interarticularis stress fracture (spondylolysis) from repetitive hyperextension. When the defect is bilateral, the vertebra loses its posterior anchor and slips anteriorly over the vertebra below. In degenerative spondylolisthesis, progressive facet arthrosis with joint remodeling allows anterior slippage without a pars defect.
Mechanisms of Pain and Déficit
Pain in spondylolisthesis arises from multiple sources: mechanical instability of the affected segment (axial pain), compression of nerve roots in the intervertebral foramen narrowed by the slippage (radicular pain), associated facet arthropathy, and reactive paraspinal muscle spasm.
In degenerative L4-L5 spondylolisthesis, the L5 nerve root is particularly vulnerable to compression in the lateral recess. Anterior slippage of L4 narrows the central canal and the foramen, potentially causing secondary spinal stenosis with neurogenic claudication — a frequent presentation in older adults.
Symptoms
Clinical presentation varies by type (isthmic versus degenerative), degree of slippage, and presence of neural compression. Many patients with low-grade spondylolisthesis are asymptomatic, with the finding discovered incidentally on imaging.
Spondylolisthesis Symptoms
- 01
Mechanical low back pain
Axial pain in the lumbar region that worsens with extension, physical activity, and prolonged standing.
- 02
Radicular pain
Radiation to the buttocks and legs along the path of the compressed root — L5 in the degenerative form (L4-L5), S1 in the isthmic form (L5-S1).
- 03
Lumbar stiffness
Limited lumbar mobility, especially extension, with a "locking" sensation.
- 04
Neurogenic claudication
In the degenerative form with secondary stenosis: leg pain on walking, relieved by sitting.
- 05
Paraspinal muscle spasm
Bilateral protective contracture of paraspinal muscles, with flattening of the lumbar lordosis.
- 06
Palpable step-off
On spinal palpation, a "step-off" can be felt at the spinous process of the affected level (especially in grades II or higher).
- 07
Tight hamstrings
Hamstring shortening is frequent, especially in adolescents with isthmic spondylolisthesis.
Diagnosis
Imaging confirms the diagnosis of spondylolisthesis, with plain lumbar spine radiography as the initial study. Magnetic resonance imaging complements the evaluation by demonstrating neural compression and the condition of the discs and facet joints.
🏥Diagnostic Workup of Spondylolisthesis
Fonte: Scoliosis Research Society and NASS Guidelines
Clinical Examination
- 1.Palpation of the step-off at the spinous process
- 2.Pain on lumbar extension — single-leg extension test (Stork test)
- 3.Segmental neurologic assessment: strength, sensation, and reflexes L4-S1
- 4.Lasegue test for associated radiculopathy
- 5.Assessment of hamstring shortening
- 6.Gait: observe lumbar hyperlordosis or posterior pelvic tilt
Imaging Studies
- 1.Lateral radiograph of the lumbar spine: identifies the slippage and allows Meyerding classification
- 2.Oblique radiograph: visualizes the pars interarticularis ("Scottie dog" sign) — a pars defect appears as a collar around the neck
- 3.Dynamic radiographs (flexion-extension): assess instability (translation > 4 mm is significant)
- 4.Lumbar MRI: assesses neural compression, discs, facets, and rules out other causes
- 5.CT with sagittal reconstruction: best assessment of the pars defect
DIFFERENTIAL DIAGNOSIS
Differential Diagnosis
Lumbar Disc Herniation
- Acute unilateral radicular pain
- Positive Lasegue
- No palpable spinal step-off
Diagnostic Tests
- Lumbar MRI
- Segmental neurologic examination
Degenerative Spinal Stenosis
Read more →- Neurogenic claudication
- May coexist with listhesis
- No mandatory instability
Diagnostic Tests
- Lumbar MRI
- Dynamic radiographs
Lumbar Facet Pain
Read more →- Axial pain with extension
- No slippage on radiograph
- No radiculopathy
Diagnostic Tests
- Lateral radiograph
- Medial branch block
Sacroiliitis
Read more →- Pain over the sacroiliac joint
- Positive SIJ provocation tests
- No slippage
Diagnostic Tests
- Gaenslen test, FABER
- Intra-articular SIJ block
Insufficiency Vertebral Fracture
- Acute pain after minimal trauma
- Patient with osteoporosis
- Pain on percussion of the spinous process
Diagnostic Tests
- Radiograph
- MRI with marrow edema
Treatments
Treatment of spondylolisthesis is predominantly conservative for grades I and II without progressive neurologic déficit. Surgery is reserved for cases with significant instability, progression of slippage, neurologic déficit, or failure of adequate conservative treatment.
The cornerstone of conservative treatment is strengthening the core and lumbar spine stabilizing muscles, combined with activity modification, pain control, and progressive functional rehabilitation.
TREATMENT OPTIONS FOR SPONDYLOLISTHESIS
| TREATMENT | INDICATION | EVIDENCE | CONSIDERATIONS |
|---|---|---|---|
| Lumbar stabilization exercises | Grades I and II, first-line treatment | Strong | Strengthening of core, deep flexors, and gluteals |
| Lumbar orthosis (brace) | Acute spondylolysis in adolescents | Moderate | Temporary use (3-6 months) to allow pars healing |
| Analgesic medication | Symptomatic control | Moderate | NSAIDs, gabapentinoids for the neuropathic component |
| Acupuncture and laser therapy | Chronic pain, associated muscle spasm | Limited specifically for spondylolisthesis — evidence is moderate in general chronic low back pain, but extrapolation to a specific structural condition requires caution | Adjunct to the exercise program |
| Epidural injection | Refractory radiculopathy or claudication | Moderate | Temporary relief to facilitate rehabilitation |
| Vertebral fusion (arthrodesis) | Grades III-IV, instability, neurologic déficit | Strong | With decompression when associated stenosis is present |
| Isolated decompression | Stenosis with stable listhesis | Moderate | Risk of destabilization — select carefully |
Approach to Low-Grade Spondylolisthesis
Phase 1
0-4 weeksActivity Modification and Analgesia
Avoid excessive lumbar extension, analgesic medication, begin gentle flexion exercises. Acupuncture to control acute pain and muscle spasm.
Phase 2
4-12 weeksStabilization Program
Progressive strengthening exercises for the core, deep flexors (multifidus, transverse abdominis), gluteals, and hamstrings.
Phase 3
3-6 monthsFunctional Return
Progression to functional and sports activities with proper technique. Follow-up radiograph to assess stability.
Maintenance
Long termMaintenance Program
Regular strengthening exercises, weight control, periodic clinical and radiographic follow-up.
Acupuncture and Laser Therapy
Medical acupuncture plays an important adjunctive role in the conservative treatment of spondylolisthesis, helping to control axial and radicular pain, reduce reactive paraspinal muscle spasm, and facilitate the therapeutic exercise program.
Proposed mechanisms include segmental modulation of nociception at the slippage level, possible release of central and peripheral endogenous opioids, relaxation of paraspinal and gluteal muscles in protective spasm, and improved local microcirculation — hypotheses derived from the general acupuncture literature on low back pain; specific evidence for spondylolisthesis is limited.
Low-level laser therapy complements acupuncture with a local anti-inflammatory effect on periarticular structures, modulation of nociceptive and neuropathic pain, and potential stimulation of tissue repair. In acute spondylolysis in adolescents, laser therapy may help modulate the inflammatory process at the site of the lysis.
For more information on the specific use of acupuncture in this condition, see our detailed article on acupuncture for lumbar spondylolisthesis.
Prognosis
Prognosis is generally favorable for grades I and II. Most patients with low-grade spondylolisthesis improve with conservative treatment and maintain satisfactory long-term function.
Slippage progression is uncommon in adults with low-grade isthmic spondylolisthesis. In the degenerative form, progression tends to be slow (1-2 mm per decade) and stabilizes as facet arthrosis worsens and "locks" the segment.
Fusion surgery (arthrodesis) offers consistent results for cases that fail conservative treatment, with satisfaction rates of 70-85%. In adolescents with acute spondylolysis, conservative treatment with bracing heals the defect in up to 80% of cases when started early.
Myths and Facts
Myth vs. Fact
Spondylolisthesis means the vertebra will "fall" and cause paralysis.
Most spondylolistheses are low-grade (I or II) and remain stable throughout life. Progression to severe grades is rare in adults. Paralysis is extremely uncommon, even in high grades.
People with spondylolisthesis cannot exercise.
Exercise is the cornerstone of conservative treatment. Core strengthening, swimming, and cycling are safe and beneficial. Only sports with excessive lumbar hyperextension should be adapted or avoided during the symptomatic phase.
Surgery is inevitable for people with spondylolisthesis.
70-85% of patients with grades I and II respond well to conservative treatment. Surgery is reserved for high grades, significant instability, progressive neurologic déficit, or failure of adequate conservative treatment.
If the radiograph shows spondylolisthesis, that is the cause of my pain.
Many patients with radiographic spondylolisthesis are completely asymptomatic. Clinical-radiologic correlation is essential — the listhesis may be an incidental finding, and the pain may have another origin.
When to Seek Medical Help
Frequently Asked Questions about Spondylolisthesis
Spondylolisthesis is the slippage of one vertebra over the one below. The two most common types are: isthmic — caused by a pars interarticularis defect (stress fracture), frequent in adolescents and young adults and predominating at L5-S1; and degenerative — caused by facet arthrosis and progressive instability, more common in women over 50 at L4-L5. The Meyerding classification grades slippage from I (0-25%) to IV (75-100%).
Diagnosis is confirmed by a lateral radiograph of the lumbar spine, which demonstrates the slippage and allows Meyerding classification. The oblique radiograph visualizes the pars interarticularis ("Scottie dog" image). Dynamic radiographs in flexion and extension assess instability (translation greater than 4 mm is significant). Magnetic resonance imaging complements the evaluation by demonstrating neural compression, the condition of the discs, and the facets.
No. Most patients with grades I and II (up to 50% slippage) respond well to conservative treatment: lumbar stabilization exercises, core strengthening, medication, and acupuncture. Surgery is indicated for grades III-IV with instability, progressive neurologic déficit, cauda equina syndrome, or failure of adequate conservative treatment after 3-6 months. In adolescents with acute spondylolysis, bracing for 3-6 months allows healing in 80% of cases.
Acupuncture acts as adjunctive treatment to control axial and radicular pain, reduce paraspinal muscle spasm, and facilitate the exercise program. Electroacupuncture at paraspinal points of the affected segment promotes endorphinergic analgesia and muscle relaxation. Laser therapy complements this with a local anti-inflammatory effect. The combination lets patients progress more rapidly in the stabilization program, which is the cornerstone of treatment.
Core stabilization exercises are the cornerstone of treatment: plank, bird-dog (without excessive extension), dead bug, and transverse abdominis activation are safe and effective. Lumbar flexion exercises (knees to chest) are well tolerated. Swimming, cycling, and walking on flat ground are safe aerobic activities. Avoid lumbar hyperextension, jumps with axial impact, and weight lifting with poor technique.
In adults with low-grade isthmic spondylolisthesis, progression is rare and generally less than 5% per decade. In the degenerative form, progression tends to be slow and self-limited, since facet arthrosis itself "stabilizes" the segment over time. In adolescents during the growth phase, radiographic monitoring is more important, since there is greater risk of progression. Regular muscle strengthening is the best preventive strategy.
An initial cycle of 8 to 12 sessions, 1-2 times per week, is recommended. The main benefit is facilitating the exercise program: controlling pain allows earlier progression of stabilization exercises. Biweekly or monthly maintenance sessions may be indicated for patients with recurrent chronic pain. The medical acupuncturist evaluates individual response and adjusts the plan based on clinical course.
Related Reading
Deepen your knowledge with related articles