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Out-of-state? Free MRI review + telehealth consult before you travel4.9 ★ · 619 Google reviewsBoard-certified — American Board of Orthopaedic SurgeryMinimally invasive, same-day spine surgery in Beverly HillsCall (424) 217-7463
When one vertebra slides forward over the one below it, the result can be back pain, nerve pain, or both — and the right fix depends entirely on whether the segment is truly unstable.
Spondylolisthesis happens when one vertebra slips forward on the vertebra beneath it, most often in the lower back. That small shift can do two things: it can crowd the nerves as they pass through, and it can leave the segment moving more than it should. The slip is graded by how far the vertebra has traveled, and low-grade slips are far more common than high-grade ones.
The cause matters. In older adults the slip usually follows degeneration, as worn discs and arthritic joints let the vertebra creep forward. In younger and more athletic people it often traces back to a small stress fracture in the bony bridge of the vertebra. Some people feel mostly back pain, others feel leg pain from pinched nerves, and many feel a mix — which is why the treatment is tailored to the specific problem the slip is causing.
Spondylolisthesis is not the same as a slipped disc. To understand the difference, it will help to review the anatomy of the spine. The top three regions of the spine, the neck (cervical), mid-back (thoracic) and lower-back (lumbar) contain 24 vertebrae. Between each vertebra, there is an intervertebral disc which serves as a shock absorber. In total there are 23 intervertebral discs which are made of firm tissue, not bone. Intervertebral discs will herniate; bones will break and chip.
One way to recall the meaning of the word spondylolisthesis is to remember that ‘spondylos’ means vertebra in Greek; ‘olisthanein’ means to slip. Combine the two, and you have a slipped vertebra.
Degenerative: Caused by degenerative changes in the spine usually involving destabilization caused by facet joint and disc degeneration which leads to a vertebra slipping
Isthmic: Microtrauma that occurs in adolescence as the result of athletics
Traumatic: Occurs after a fracture of the pars interarticularis or facet joint structures due to a trauma such as a car accident.
Dysplastic: Congenital condition often with the abnormal alignment of facet joints
Pathologic: Related to systemic causes such as bone and connective tissue disorders, infections or tumors.
What are the symptoms of spondylolisthesis?
✓Aching low back pain, often worse with standing or arching back
✓Leg pain, numbness, or tingling from crowded nerves
✓Tight hamstrings or a change in walking posture
✓Pain that eases when bending forward or sitting
✓Weakness or heaviness in the legs with activity
✓A sense of the back giving way or feeling unstable
Symptoms can also include:
Leg stiffness
Pain in buttocks
Why a Vertebra Slips Out of Place
Age-related degeneration of the discs and facet joints
A stress fracture in the bony bridge of the vertebra (spondylolysis)
Repetitive hyperextension from sports like gymnastics or football
Loss of disc height that loosens the segment
Congenital differences in the shape of the joints
X-rays and MRIs for a Slipped Vertebra
Dr. Melamed confirms spondylolisthesis with standing X-rays, which show the slip under load, and often flexion-extension views that reveal whether the vertebra moves when you bend forward and back — the key question of stability. An MRI maps how the slip is affecting the nerves and discs. Distinguishing a stable slip that is simply pinching a nerve from a genuinely unstable segment is what decides whether a simple decompression will do or something more is warranted.
How do you treat spondylolisthesis?
Many people with spondylolisthesis do well without surgery, so Dr. Melamed starts with conservative care: core-focused physical therapy to stabilize the segment, activity modification, anti-inflammatory measures, and image-guided injections when nerve pain is prominent. Low-grade, stable slips in particular often settle and stay manageable with this approach given a fair trial.
When leg pain comes mainly from a pinched nerve and the segment is stable, a muscle-sparing biportal endoscopic decompression can free the nerve through incisions under a centimeter, without fusing anything. When flexion-extension imaging shows the segment is truly unstable, stabilization may be the durable answer — but Dr. Melamed treats that as a last resort, performs it with minimally invasive, muscle-sparing technique, and only after conservative care and a careful stability assessment point to it.
Other options include:
Yoga, Pilates and Tai Chi may also help the patient improve mobility, reduce stress and enhance the immune system.
What if the nonsurgical treatments do not relieve the pain of spondylolisthesis?
Some patients may not respond to conservative therapy and may require surgery. For patients with severe pain due to the degree of slippage of the vertebra, surgery may be the optimal treatment. Dr. Melamed may request additional imaging tests of the disc lesion using X-rays and MRIs. He will review the results with you and discuss the best option. For most patients who suffer from a severely slipped vertebra, the best surgical option may be a spinal fusion.
Modern spinal fusion operations are minimally invasive. The required incisions are small which leads to lower risks of infection, decreased bleeding and reduced back muscle discomfort.
No. Many slips are low-grade and stable, meaning the vertebra is not moving abnormally, and those often improve with therapy or a simple decompression to free a pinched nerve. Fusion is reserved for segments that flexion-extension imaging shows are genuinely unstable, and Dr. Melamed treats it as a last resort.
How do you know if my spondylolisthesis is unstable?
The clearest test is bending X-rays taken while you flex forward and extend back. If the vertebra shifts noticeably between those positions, the segment is unstable; if it holds steady, it is stable. That distinction guides the whole treatment plan.
Can spondylolisthesis be treated without cutting the muscle?
Yes, in most cases. When the goal is to relieve a pinched nerve, Dr. Melamed uses biportal endoscopic decompression through tiny incisions with no muscle stripping. Even when stabilization is needed, he favors muscle-sparing, minimally invasive techniques.
