The Centers for Advanced Orthopaedics
Maryland Orthopedic Specialists
A Division of The Centers for Advanced Orthopaedics
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Spine, Neck & Back

Lumbar Disc Herniation & Sciatica

Lumbar disc herniation with associated sciatica is one of the most common spinal conditions seen in adults, affecting hundreds of thousands of Americans each year and representing a leading cause of lower back and leg pain. The reassuring news is that the vast majority of patients — upward of 80–90% — improve substantially without surgery given appropriate time, activity guidance, and targeted treatment. At Maryland Orthopedic Specialists, our non-operative spine specialists and pain management injection specialists work together to deliver evidence-based, individualized care designed to get you back to your life as quickly and safely as possible.

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What is lumbar disc herniation & sciatica?

### Anatomy The lumbar spine consists of five vertebrae (L1–L5) separated by intervertebral discs — flexible cushions that absorb compressive load and allow spinal movement. Each disc has two main components: - Nucleus pulposus: The soft, gel-like inner core, composed largely of water and proteoglycans, that provides the primary shock-absorbing function.

Anatomy

The lumbar spine consists of five vertebrae (L1–L5) separated by intervertebral discs — flexible cushions that absorb compressive load and allow spinal movement. Each disc has two main components:

  • Nucleus pulposus: The soft, gel-like inner core, composed largely of water and proteoglycans, that provides the primary shock-absorbing function.
  • Annulus fibrosus: The tough, concentrically layered outer ring of fibrocartilage and collagen that contains the nucleus and resists tensile and rotational forces.

Mechanism of Herniation

Disc herniation occurs when the nucleus pulposus is displaced beyond the normal boundaries of the annulus fibrosus, most commonly through a posterolateral defect where the annulus is thinnest and unsupported by the posterior longitudinal ligament. Three morphological subtypes are recognized:

  • Protrusion — Nucleus bulges outward but the outer annular fibers remain intact; the base of the displaced material is wider than its apex.
  • Extrusion — Nuclear material breaks through all annular layers but remains connected to the parent disc.
  • Sequestration — A fragment of nuclear material separates completely from the disc and migrates freely within the epidural space.

Sequestered fragments often undergo the most robust spontaneous resorption due to an inflammatory-immune response that degrades the foreign material over weeks to months.

How Herniation Causes Sciatica

When herniated disc material contacts or compresses a lumbar nerve root, it triggers both mechanical compression and a chemical inflammatory cascade (mediated by cytokines including TNF-α and phospholipase A2). This combination irritates the nerve root, producing the characteristic radiating pain known as sciatica — shooting pain, numbness, or weakness that travels down the buttock, thigh, leg, and sometimes into the foot in a pattern determined by which nerve root is involved.

Most Common Levels

  • L4–L5: Compression of the L5 nerve root → pain and weakness radiating to the lateral leg, dorsum of the foot, and great toe; weakness of great toe/ankle dorsiflexion.
  • L5–S1: Compression of the S1 nerve root → pain radiating to the posterior calf and lateral foot; diminished Achilles reflex; weakness of ankle plantarflexion.

These two levels account for approximately 95% of all lumbar disc herniations.

Who Is Affected

Lumbar disc herniation peaks in incidence between the third and fifth decades of life (ages 30–50), when discs are metabolically active but have begun to desiccate. Men are affected slightly more often than women. Occupational risk factors include repetitive heavy lifting, prolonged seated postures (especially with whole-body vibration), and jobs requiring frequent forward bending and twisting. Smoking, obesity, and a sedentary lifestyle are additional independent risk factors through their effects on disc nutrition and biomechanics.

Treatment options

Most lumbar disc herniations improve without surgery — the goal of treatment is to manage pain while the body heals naturally.

Activity and Posture

Avoid prolonged sitting and heavy lifting during the acute phase, but keep moving as much as pain allows. Brief rest is fine, but bed rest slows recovery and is not recommended. Simple ergonomic changes — like using a lumbar support when seated and avoiding prolonged forward bending — reduce pressure on the disc. Most daily activities can continue with minor modifications.

Medications

NSAIDs such as ibuprofen or naproxen are the first-line medication and work by reducing inflammation around the irritated nerve root. A short course of oral steroids can be prescribed for severe flares to provide faster relief. Muscle relaxants help when back spasm is a significant part of the pain picture.

Physical Therapy

Physical therapy is the foundation of recovery and should begin as soon as pain allows. A McKenzie-based approach uses directional exercises to reduce disc pressure and centralize leg pain. Neural mobilization techniques help desensitize the irritated nerve root, and core strengthening protects the disc over the long term.

Epidural Steroid Injection

An epidural steroid injection delivers corticosteroid directly near the irritated nerve root, reducing inflammation and easing leg pain. This creates a window of relief that allows patients to engage more fully in physical therapy. Injections are most effective when performed within the first 3–6 months of symptoms, and a series of up to three may be recommended based on response.

Surgical Referral

Surgery is reserved for patients with progressive weakness, bowel or bladder involvement (which requires urgent evaluation), or failure to improve after 6–12 weeks of consistent conservative care. When surgical consultation is needed, MOS coordinates that referral with a trusted spine surgery specialist.

Frequently Asked Questions

Q: Do I need surgery for a lumbar disc herniation?
A: The vast majority of patients do not need surgery. Published evidence consistently shows that 80–90% of patients with lumbar disc herniation and sciatica improve significantly with non-operative care — activity modification, physical therapy, anti-inflammatory medications, and epidural steroid injections — within 6–12 weeks. Surgery is generally reserved for those with persistent severe symptoms after 6–12 weeks of appropriate conservative treatment, progressive neurological deficits, or the rare emergency of cauda equina syndrome.
Q: How long will it take for my symptoms to get better?
A: Most patients begin to notice meaningful improvement within 2–6 weeks of starting treatment, and the majority are substantially better by 6–12 weeks. Larger herniations (extrusions and sequestrations) often resorb on their own over this period, removing the source of nerve irritation. Factors that influence recovery speed include the type and size of the herniation, your activity level, adherence to physical therapy, and overall health.
Q: What is sciatica?
A: "Sciatica" is a term for radiating pain caused by irritation or compression of a lumbar nerve root — most commonly L5 or S1 — as it exits the spine. The sciatic nerve, formed from these lumbar and sacral nerve roots, is the longest and widest nerve in the body. When a herniated disc or other structure compresses this nerve root, it produces characteristic shooting pain, numbness, or weakness that travels down the buttock, thigh, leg, and foot along a specific pathway (dermatome). Sciatica is a symptom, not a diagnosis in itself — the underlying cause (in most cases a disc herniation) determines treatment.
Q: What is an epidural steroid injection, and will it hurt?
A: An epidural steroid injection (ESI) is a procedure in which a small amount of corticosteroid (anti-inflammatory medication) is delivered directly into the epidural space of the spine, adjacent to the inflamed nerve root. All injections at MOS are performed under fluoroscopic (live X-ray) guidance to ensure precise placement. The procedure takes approximately 15–20 minutes; local anesthetic is used to minimize discomfort. Most patients experience mild pressure or brief stinging during needle placement. Some experience temporary numbness in the leg immediately after the injection due to the local anesthetic component.
Q: Can the disc herniation come back after treatment?
A: Yes, recurrence is possible but not the norm. In patients who recover with non-operative care, lifestyle modification, maintaining a healthy weight, and continued core strengthening significantly reduce the risk of recurrence. After microdiscectomy, the risk of reherniation at the same level is approximately 5–15% over 10 years. Our team provides structured post-treatment rehabilitation and ergonomic guidance to minimize this risk.
Q: What are the red flag symptoms that require urgent care?
A: Most disc herniations cause pain and neurological symptoms that, while distressing, can be safely managed on an outpatient basis. However, the following symptoms require immediate emergency evaluation — call 911 or go to the nearest emergency department without delay: - New-onset inability to urinate or control the bladder/bowel - Numbness in the perineum (saddle area), inner thighs, or genitals - Rapidly worsening weakness in both legs - Loss of rectal tone These signs may indicate cauda equina syndrome, a spinal emergency caused by compression of multiple nerve roots at once, which requires urgent surgical decompression to prevent permanent neurological injury.

Meet the specialists

Christopher S. Raffo, MD

Christopher S. Raffo, MD

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John J. Christoforetti, MD

John J. Christoforetti, MD

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James S. Gardiner, MD

James S. Gardiner, MD

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Peter G. Fitzgibbons, MD

Peter G. Fitzgibbons, MD

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Medically reviewed by Christopher S. Raffo, MD
Last reviewed May 1, 2026

References

  1. Natural history of lumbar disc herniation: Saal JA, Saal JS. Nonoperative treatment of herniated lumbar intervertebral disc with radiculopathy: an outcome study. Spine (Phila Pa 1976). 1989;14(4):431–437. doi:10.1097/00007632-198904000-00018. PubMed
  2. Natural history, long-term controlled trial: Weber H. Lumbar disc herniation: a controlled, prospective study with ten years of observation. Spine (Phila Pa 1976). 1983;8(2):131–140. doi:10.1097/00007632-198303000-00003. PubMed
  3. Epidural steroid injection RCT: Carette S, Leclaire R, Marcoux S, et al. Epidural corticosteroid injections for sciatica due to herniated nucleus pulposus. N Engl J Med. 1997;336(23):1634–1640. doi:10.1056/NEJM199706053362303. PubMed
  4. ESI compared with discectomy, prospective randomized: Buttermann GR. Treatment of lumbar disc herniation: epidural steroid injection compared with discectomy — a prospective, randomized study. J Bone Joint Surg Am. 2004;86(4):670–679. Available via JBJS
  5. Microdiscectomy vs. conservative care — SPORT Trial: Weinstein JN, Tosteson TD, Lurie JD, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the Spine Patient Outcomes Research Trial (SPORT): a randomized trial. JAMA. 2006;296(20):2441–2450. doi:10.1001/jama.296.20.2441. JAMA
  6. SPORT observational cohort: Weinstein JN, Lurie JD, Tosteson TD, et al. Surgical vs nonoperative treatment for lumbar disk herniation: the SPORT observational cohort. JAMA. 2006;296(20):2451–2459. doi:10.1001/jama.296.20.2451. JAMA
  7. Cauda equina syndrome — clinical review: Miller J, West J, Khawar H, Middleton R. Cauda equina syndrome. Br J Hosp Med (Lond). 2023;84(11). doi:10.12968/hmed.2023.0012. IMR Press
  8. AAOS OrthoInfo patient resource: American Academy of Orthopaedic Surgeons. Herniated Disk in the Lower Back. OrthoInfo. Available at: https://orthoinfo.aaos.org/en/diseases--conditions/herniated-disk-in-the-lower-back/