Spondylolisthesis
A condition in which one vertebra slips forward over the one below it, which can cause lower back pain and, when nerves are compressed, leg symptoms.
Quick Answer
Spondylolisthesis is a condition in which one vertebra slips forward relative to the vertebra below it. It most often occurs in the lower back and can result from a stress fracture in younger people or from age-related degeneration in older adults. Many cases cause only mild symptoms, but a significant slip can produce lower back pain and compress nerves, leading to leg pain, numbness, or weakness. Treatment ranges from conservative care to decompression and fusion.
Key Takeaways
- Spondylolisthesis is forward slippage of one vertebra over the one below it.
- Common types are isthmic (from a stress fracture) and degenerative (from age-related change).
- It often causes lower back pain and can compress nerves to cause leg symptoms.
- Many patients are managed successfully without surgery.
- When a slip causes nerve compression or instability, decompression with fusion may be recommended.
AT A GLANCE
| What it is | Forward slippage of one vertebra over another |
|---|---|
| Common types | Isthmic (stress fracture) and degenerative (age-related) |
| Most common level | L4-L5 (degenerative) and L5-S1 (isthmic) |
| Typical symptoms | Lower back pain, sometimes with leg pain or numbness |
| First-line treatment | Physical therapy, activity modification, medication |
| Surgical option | Decompression with fusion for instability or nerve compression |
Symptoms
Many people with mild spondylolisthesis have little or no pain. When symptoms occur, the most common is lower back pain that may worsen with activity, standing, or bending backward, and improve with rest. Some patients notice tight hamstrings or a change in posture. Pain is often related to the instability of the slipped segment.
When the slip narrows the space around the nerves, it can cause leg symptoms similar to sciatica or stenosis, including pain, numbness, tingling, or weakness in the legs, sometimes brought on by walking or standing. The combination of back pain and leg symptoms often reflects both the instability and the associated nerve compression.
Common Warning Signs
- Lower back pain worse with standing or bending backward
- Pain relieved by rest or sitting
- Tight hamstrings or a change in posture or gait
- Leg pain, numbness, or tingling
- Back pain that worsens gradually over time
When to Seek Care Promptly
- Progressive leg weakness
- Numbness in the groin or saddle area
- Loss of bladder or bowel control
- Rapidly worsening leg pain
- A significant increase in slippage on imaging
Diagnosis
Diagnosis begins with a history and examination, followed by X-rays, which show the slippage and allow it to be graded by severity. Flexion and extension X-rays, taken while bending forward and backward, can reveal whether the slipped segment is unstable and moves abnormally.
MRI is used to evaluate the nerves and any associated compression, particularly when leg symptoms are present. CT can provide detailed images of a stress fracture in isthmic spondylolisthesis. Together these studies define the type, severity, and stability of the slip and whether nerves are involved.
Treatment
Most patients with spondylolisthesis are treated without surgery, especially when the slip is mild and stable. Physical therapy that strengthens the core and stabilizing muscles, activity modification, and anti-inflammatory medication typically improve symptoms. Injections may help when there is nerve-related leg pain.
Surgery is considered when there is significant nerve compression causing leg symptoms that do not respond to conservative care, when the slip is unstable or progressing, or when back pain is disabling and clearly related to the unstable segment. The usual procedure combines a decompression to relieve the nerves with a fusion to stabilize the slipped level. Robotic navigation may be used to place instrumentation precisely.
At Atlantic Brain and Spine, spondylolisthesis cases are reviewed through the spine board so that the decision between conservative care and decompression with fusion reflects combined surgical expertise and the specific features of the slip.
The Diagnosis-to-Treatment Pathway
1. Clinical evaluation
History and exam assess back pain and any leg symptoms.
2. X-ray and stability views
Standing and flexion-extension X-rays grade the slip and check for instability.
3. MRI
Imaging evaluates the nerves and any compression when leg symptoms are present.
4. Conservative care
Core-focused therapy, activity modification, and medication are tried first.
5. Targeted injection
Injections may relieve nerve-related leg pain and aid rehabilitation.
6. Surgical review
Instability, progression, or refractory nerve compression prompts spine board review.
7. Decompression and fusion
The nerves are relieved and the unstable segment is stabilized.
Frequently Asked Questions
Spondylolysis is a stress fracture in a small part of a vertebra, without slippage. Spondylolisthesis is when a vertebra actually slips forward over the one below. Spondylolysis can lead to isthmic spondylolisthesis if the fracture allows the vertebra to slip.
It varies widely. Many mild, stable slips cause little trouble and are managed conservatively. A significant or unstable slip that compresses nerves can cause disabling back and leg symptoms and may need surgery. The severity, stability, and nerve involvement determine how serious it is.
Often, yes. Physical therapy focused on core stabilization, activity modification, and medication help many patients, particularly with mild, stable slips. Surgery is considered for instability, progression, or nerve compression that does not respond to conservative care.
Some slips remain stable for years, while others gradually progress, particularly degenerative ones. Flexion and extension X-rays help assess whether a slip is unstable. Progressive slippage or worsening symptoms are reasons to consider surgical stabilization.
The typical operation combines a decompression, to relieve pressure on the nerves, with a fusion, to stabilize the slipped segment. Screws and an interbody device hold the level in position while it fuses. Robotic navigation may be used for precise placement, and minimally invasive techniques can reduce muscle disruption.
Usually, yes. Most people can remain active with guidance, and core-strengthening exercise is often part of treatment. Your care team can advise which activities to modify based on the type and stability of your slip.
Specialists Who Treat Spondylolisthesis
Your care is provided by Atlantic Brain and Spine's spine team, including fellowship-trained neurosurgeons and orthopedic spine surgeons.
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