What is lumbar disc herniation?
A lumbar disc herniation — sometimes called a slipped, ruptured, or bulging disc in the lower back — happens when the inner gel of a lumbar disc breaches its tougher outer ring. When that displaced material contacts an adjacent nerve root, the result is typically leg pain along the distribution of that nerve, often with numbness or weakness. Most lumbar disc herniations improve over weeks to months as the body resorbs the displaced material — surgery is reserved for symptoms that don't resolve, that progress, or that produce significant weakness.
Anatomy
Each lumbar disc has a tough fibrous outer ring (annulus fibrosus) and a softer gel-like center (nucleus pulposus). The discs sit between the five lumbar vertebrae and bear the highest mechanical load in the spine, which is why the lumbar region is the most common site of disc herniation. Herniations most commonly occur at the L4–L5 and L5–S1 levels. The exact pattern of leg symptoms — which area tingles, which muscle is weak — closely follows which nerve root is compressed.
Symptoms
- Sharp pain radiating from the lower back through the buttock and down one leg (sciatica)
- Numbness or tingling in the foot, calf, or specific toes
- Weakness in the leg or foot, including foot drop
- Pain worsened by sitting, coughing, sneezing, or bending forward
- Reflex changes detected on exam
Causes
- Age-related disc degeneration that weakens the outer ring
- Sudden injury — lifting, twisting, or trauma
- Repetitive strain from work or athletics
- Genetic predisposition to disc disease
Who is at risk?
- Age 30 to 50
- Sedentary lifestyle or prolonged sitting
- Jobs requiring repetitive lifting or twisting
- Smoking, which accelerates disc degeneration
- Obesity, which increases mechanical load on lumbar discs
- Family history of disc disease
Diagnosis
Diagnosis combines a focused history, a neurologic examination of the lower extremities (strength, sensation, reflexes, and provocative maneuvers like the straight-leg-raise test), and imaging. MRI is the gold standard for confirming a lumbar herniation and identifying which nerve is compressed.
When to see a spine surgeon
Most lumbar disc herniations improve without surgery. Seek urgent evaluation for severe or progressive leg weakness, foot drop, numbness in the groin or saddle area, or any change in bowel or bladder function — these can indicate cauda equina syndrome, a surgical emergency.
Non-surgical treatment
First-line treatment is non-surgical: short-term activity modification, anti-inflammatory medications, structured physical therapy focused on core stabilization and nerve mobilization, and image-guided epidural or selective nerve root injections. The majority of patients recover with this approach as the herniation resorbs over time.
Surgical options
Most lumbar disc herniations that require surgery are well-suited to endoscopic decompression — a small-incision technique that removes the herniated fragment compressing the nerve through tiny portals. The rest of the disc, the surrounding muscle, and motion at the segment are preserved. Recovery is measured in weeks rather than months, and many patients feel immediate leg-pain relief on waking from surgery.
Related procedures
This page is for general educational purposes and is not medical advice. Diagnosis and treatment recommendations require an in-person evaluation. To schedule a consultation with Erick R. Kazarian, MD, please book an appointment.