What is Sciatica?
Sciatica is pain caused by irritation or compression of the sciatic nerve, the largest nerve in the human body. This nerve originates in the lower back (lumbar spine), passes through the buttock, and runs down each leg to the foot. When the sciatic nerve is compressed or inflamed, it causes characteristic pain that radiates from the lower back through the buttock and down one or both legs.
Sciatica is extremely common in Singapore, affecting thousands of people of all ages. The condition ranges from mild discomfort to severe, disabling pain. Unlike general back pain, sciatica specifically follows the distribution of the sciatic nerve, typically affecting only one side of the body. Most cases of sciatica improve significantly with conservative treatment within 4–6 weeks, though some cases may require longer recovery periods.
How Does Sciatica Develop?
Sciatica develops when the sciatic nerve is compressed or pinched at or near the lumbar spine. This compression triggers inflammation of the nerve, which leads to pain signals being transmitted down the path of the nerve into the leg and foot. The severity depends on the degree of compression and whether the nerve root is being irritated or actually damaged.
The most common cause is a herniated intervertebral disc—the gel-like nucleus of the disc pushes through the outer fibrous layer and presses directly on the nerve root. Other causes include spinal stenosis (narrowing of the spinal canal), spondylolisthesis (one vertebra sliding forward on another), piriformis syndrome (the piriformis muscle in the buttock compresses the nerve), or inflammation of the nerve root itself.
Several factors increase the risk of developing sciatica: age-related spinal degeneration, poor posture, sedentary lifestyle, obesity, smoking, and occupations involving repetitive bending or heavy lifting. In Singapore, prolonged sitting at desks in office environments is a significant risk factor.
Symptoms of Sciatica
Sciatica symptoms are distinctive and typically follow the path of the sciatic nerve:
- Lower back pain: Usually mild or absent, but may be present.
- Buttock pain: Often the initial site of pain, may be constant or intermittent.
- Leg pain: Radiates from the buttock down the back or side of the leg, sometimes extending to the foot.
- Numbness or tingling: In the leg, foot, or toes, particularly if the nerve is severely compressed.
- Weakness: In the affected leg or foot, making it difficult to walk, climb stairs, or drive.
- Burning sensation: A characteristic burning or electric-shock-like sensation is common.
- Pain worse with certain movements: Bending forward, prolonged sitting, coughing, or sneezing may aggravate pain.
Emergency symptoms: Seek immediate medical attention if you experience sudden loss of bowel or bladder control, numbness in the genital area, progressive leg weakness, or high fever with severe back pain. These may indicate cauda equina syndrome or infection, both surgical emergencies.
Causes and Risk Factors
Sciatica results from compression of the nerve root, most commonly in the lumbar spine:
Herniated disc:
The most common cause (70% of cases), where nucleus material presses on a nerve root.
Spinal stenosis:
Age-related narrowing of the spinal canal, reducing space for nerve roots.
Spondylolisthesis:
Forward slippage of a vertebra compressing the nerve root below.
Piriformis syndrome:
The piriformis muscle in the buttock irritates or compresses the sciatic nerve.
Pregnancy:
The growing uterus and hormonal changes can compress the sciatic nerve.
Sitting on a wallet:
Prolonged pressure on the sciatic nerve from a thick wallet in back pocket.
Muscle tightness:
Tight hamstrings or gluteal muscles can contribute to nerve compression.
Risk factors include age (30–50 years), prolonged sitting, heavy lifting, diabetes, sedentary lifestyle, obesity, smoking, and poor posture.
How is Sciatica Diagnosed?
Diagnosis begins with a thorough medical history and physical examination. Your spine surgeon will perform specific tests such as the straight leg raise test (Lasegue's test) and the cross-over straight leg raise test (Fabere test) to reproduce sciatica pain and localize the compressed nerve root.
Imaging helps confirm the diagnosis and identify the underlying cause:
MRI:
Gold standard for visualizing the nerve, disc, and spinal structures. Shows the exact location and severity of nerve compression.
CT scan:
Useful for assessing bone anatomy if MRI is contraindicated.
X-rays:
May show degenerative changes, spondylolisthesis, or other spinal abnormalities.
EMG/NCS:
Nerve conduction studies or electromyography may assess nerve function if the diagnosis is uncertain or to guide surgical planning.
Non-Surgical Treatment Options
The vast majority of sciatica cases resolve with conservative management. Here are evidence-based approaches:
1. Gentle Movement and Activity
Bed rest is not recommended, as movement promotes healing and prevents stiffness. Light activities such as short walks, gentle stretching, and gradual return to normal function facilitate recovery. Avoid activities that worsen pain, but maintain some level of activity throughout the day.
2. Heat or Ice Therapy
Apply ice for the first 48 hours to reduce inflammation and pain. After 48 hours, switch to heat therapy (heating pad, warm bath) to relax muscles and increase blood flow to the area. Many patients find alternating heat and ice effective.
3. Pain Relief Medication
Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or naproxen reduce inflammation and pain. For severe pain, muscle relaxants or short-term opioid medication may be prescribed by your doctor. Topical analgesic creams can also provide localized relief.
4. Physiotherapy
A structured physiotherapy program is highly beneficial. Sessions focus on stretching the piriformis muscle, hamstrings, and hip flexors; strengthening the core muscles and glutes; improving posture; and teaching proper body mechanics. Physiotherapy addresses both the symptoms and underlying biomechanical factors.
5. Steroid Injections (if needed)
If conservative treatment does not provide relief within 4–6 weeks, an epidural steroid injection may be offered. This delivers anti-inflammatory medication directly to the irritated nerve root, reducing inflammation and pain. Effects typically last 3–6 months and may be repeated if needed.
When is Surgery Considered for Sciatica?
Surgery is considered when symptoms persist for 6–8 weeks despite conservative treatment, or if neurological deficits (weakness, numbness) are progressive or severe. Surgery aims to remove or reduce the pressure on the sciatic nerve. Common procedures include:
Microdiscectomy / Discectomy
If a herniated disc is compressing the nerve, a microdiscectomy removes the protruding disc material under magnification. This is a minimally invasive procedure that provides rapid pain relief. Learn more: Microdiscectomy.
Laminectomy or Foraminotomy
If spinal stenosis or a bone spur is compressing the nerve, a laminectomy (removal of the lamina) or foraminotomy (enlargement of the nerve root opening) widens the spinal canal and relieves pressure. See Laminectomy and Foraminotomy.
Endoscopic Spine Surgery
Advanced minimally invasive endoscopic techniques allow nerve decompression through a very small incision, reducing tissue trauma and recovery time. Details: Endoscopic Spine Surgery.
Recovery and What to Expect
Recovery timelines vary based on the cause and treatment approach:
- Conservative care: Most patients improve significantly within 4–6 weeks. Complete resolution typically takes 8–12 weeks with physiotherapy.
- Microdiscectomy: Same-day or overnight discharge; light activity within 1–2 weeks; full recovery in 6–8 weeks.
- Laminectomy or Foraminotomy: Hospital stay 1–2 days; light activity within 2–4 weeks; full recovery in 8–12 weeks.
Post-recovery management is critical to prevent recurrence:
- Continue physiotherapy and core strengthening exercises even after pain resolves.
- Maintain proper posture and ergonomics, especially during office work.
- Avoid prolonged sitting; take frequent breaks to stand and stretch.
- Manage weight and avoid smoking to promote healing.
- Practice proper lifting techniques (bend at knees, not the waist).
- Stay physically active with low-impact exercise (walking, swimming, cycling).
Frequently Asked Questions
Q1: How long does sciatica typically last?
A. Most cases resolve within 4–6 weeks with conservative treatment. However, some people experience longer recovery, especially if the nerve compression is severe. Persistent sciatica lasting more than 12 weeks may warrant surgical evaluation.
Q2: Can I work with sciatica?
A. Depending on the severity and your job demands, you may be able to continue working with modifications. Avoid heavy lifting and prolonged sitting. If your job requires significant physical activity, you may need temporary work modifications or time off during the acute phase.
Q3: Is sciatica surgery always successful?
A. Surgical success rates for sciatica are high, typically 85–95% for symptom relief. However, success depends on correct diagnosis of the underlying cause, appropriate surgical technique, and post-operative care including physiotherapy.
Q4: Can sciatica recur after surgery?
A. Recurrence is possible (5–10% of cases) if the underlying degenerative condition progresses or if symptoms return due to new herniation at the same or different level. Maintaining good posture, core strength, and avoiding heavy strain reduces this risk.
Q5: What activities should I avoid with sciatica?
A. Avoid prolonged sitting, heavy lifting, forward bending, high-impact activities (running, jumping), and repetitive twisting motions. Keep your spine neutral and avoid positions that aggravate pain. Your physiotherapist can advise on safe activities during recovery.
This is educational content only and not medical advice. If you are experiencing sciatica symptoms, consult a qualified spine surgeon for proper evaluation and personalized treatment. Dr. Huang Yilun at Total Orthopaedic Care and Surgery, Novena Medical Centre, Singapore, specializes in the diagnosis and treatment of sciatica using both conservative and minimally invasive surgical approaches.
For more information, visit About Dr. Huang or Contact us to schedule a consultation.
Related conditions: Herniated Disc | Related procedures: Endoscopic Spine Surgery