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Spondylolisthesis - Causes, Symptoms & Treatment

Spondylolisthesis is a spinal condition in which one vertebra slips forward over the one below it. It can cause back pain, nerve compression, and reduced mobility.

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Things worth knowing about "Spondylolisthesis"

Spondylolisthesis is a spinal condition in which one vertebra slips forward over the one below it. It can cause back pain, nerve compression, and reduced mobility.

What is Spondylolisthesis?

Spondylolisthesis is a spinal condition in which one vertebral body slips forward relative to the vertebra directly below it. The condition most commonly affects the lower lumbar spine, particularly the L4/L5 and L5/S1 levels. In rarer cases, it can also occur in the cervical spine.

The term derives from the Greek words spondylos (vertebra) and olisthesis (slipping). The degree of slippage is graded on a scale from I to IV using the Meyerding classification, which helps guide treatment decisions.

Causes

There are several types of spondylolisthesis, each with distinct causes:

Isthmic spondylolisthesis: Caused by a stress fracture in the vertebral arch (spondylolysis), commonly seen in young athletes involved in high-impact or hyperextension sports.
Degenerative spondylolisthesis: The most common form in adults over 50, resulting from age-related wear and tear of the intervertebral discs and facet joints.
Congenital spondylolisthesis: Due to a developmental defect in the vertebral joint processes, present from birth.
Traumatic spondylolisthesis: Caused by an acute injury, such as a fracture of the vertebral arch following an accident.
Pathological spondylolisthesis: Resulting from diseases that weaken the bone, such as osteoporosis, tumors, or infections.

Symptoms

Many people with mild spondylolisthesis have no symptoms. When symptoms do occur, they may include:

Persistent low back pain, often worsening with physical activity
Radiating pain into the buttocks, thighs, or legs (sciatica)
Numbness or tingling in the legs or feet
Muscle weakness in the lower extremities
Stiffness and limited range of motion in the spine
In severe cases: difficulty walking, or loss of bladder and bowel control (medical emergency)

Diagnosis

Diagnosis typically involves a clinical examination combined with imaging studies:

X-ray: First-line imaging, ideally taken in a standing position and in flexion/extension views to assess the degree and stability of the slippage.
MRI (Magnetic Resonance Imaging): Provides detailed visualization of soft tissues including discs, nerves, and the spinal cord; essential for evaluating nerve compression.
CT (Computed Tomography): Used to assess bony structures in detail, particularly to identify spondylolysis or fractures.

The severity is graded according to the Meyerding classification: Grade I (up to 25% slippage) through Grade IV (more than 75% slippage). Complete displacement is referred to as spondyloptosis.

Treatment

Conservative Treatment

For Grade I and II spondylolisthesis without significant neurological deficits, conservative management is usually effective:

Physical therapy: Targeted exercises to strengthen the core and back muscles and stabilize the spine
Pain management: Use of analgesics (e.g., NSAIDs such as ibuprofen) and, if needed, muscle relaxants
Heat and cold therapy for short-term pain relief
Orthopedic supports: Lumbar braces or corsets to reduce strain
Activity modification: Avoiding high-impact activities that stress the spine

Surgical Treatment

Surgery is considered when:

Conservative treatment fails to provide relief after several months
Significant or progressive neurological deficits are present
The slippage continues to worsen (higher-grade instability)
Bladder or bowel dysfunction occurs (cauda equina syndrome)

The most common surgical procedure is spinal fusion (spondylodesis), in which the affected vertebrae are stabilized using screws and rods and fused together over time. Decompression surgery may also be performed to relieve pressure on compressed nerves by widening the spinal canal.

Prognosis and Outlook

Most people with low-grade spondylolisthesis (Grade I or II) can be managed conservatively and maintain a good quality of life. Higher-grade cases or those with persistent symptoms often respond well to timely surgical intervention. Long-term follow-up and regular back-strengthening exercises are recommended to prevent progression.

References

Meyerding HW. Spondylolisthesis. Surg Gynecol Obstet. 1932;54:371-377.
Wiltse LL, Newman PH, Macnab I. Classification of spondylolysis and spondylolisthesis. Clin Orthop Relat Res. 1976;117:23-29.
Hu SS, Tribus CB, Diab M, Ghanayem AJ. Spondylolisthesis and spondylolysis. J Bone Joint Surg Am. 2008;90(3):656-671.

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