Lumbar Radiculopathy

**Lumbar radiculopathy** refers to symptoms caused by compression or irritation of a lumbar nerve root. The term is broader than "[sciatica](/condition/sciatica)" — sciatica specifically refers to L4, L5, or S1 radiculopathy with pain along the sciatic nerve distribution, while radiculopathy can affect any lumbar level (L1-S1) and includes both pain and neurological deficits. **Specific Nerve Root Patterns:** **L1, L2, L3 Radiculopathy** (uncommon, ~5%): - Pain in the groin and anterior thigh - Hip flexor or quadriceps weakness - Reduced patellar reflex - Less commonly compressed because foramina are larger **L4 Radiculopathy** (~15-20%): - Pain down the medial leg to the medial calf and arch of the foot - Quadriceps and tibialis anterior weakness - Reduced patellar reflex - Difficulty with knee extension and ankle dorsiflexion **L5 Radiculopathy** (~40-45% — most common): - Pain down the lateral thigh, lateral calf, top of foot, and great toe - Weakness of ankle dorsiflexion (foot drop) and great toe extension - Numbness in the dorsum of the foot - No reflex changes typically (no specific reflex tests L5) **S1 Radiculopathy** (~30-35%): - Pain down the posterior thigh, posterior calf, lateral foot, and small toes - Weakness of plantar flexion (cannot rise on toes) - Reduced Achilles reflex - Numbness in the lateral foot and sole **Causes:** - **Disc herniation** (90% in adults <50) — soft disc material protrudes and compresses nerve root - **Foraminal stenosis** (more common >50) — bone spurs and degenerative narrowing - **[Spondylolisthesis](/condition/spondylolisthesis)** — vertebral slippage compressing nerve - **Synovial cyst** of the facet joint - Rarely: tumors, infections, or epidural hematoma

## Root Causes **1. Lumbar Disc Herniation (90% of cases in adults <50):** - Acute mechanical event — heavy lifting, twisting, or sudden movement - Progressive disc degeneration with annular tear allowing nucleus pulposus to herniate - Most common at L4-L5 (compressing L5) and L5-S1 (compressing S1) - Disc material physically compresses nerve root AND causes chemical inflammation **2. Foraminal Stenosis (More common in adults >50):** - Degenerative changes — bone spurs, facet hypertrophy, disc height loss - Narrowing of the neural foramen where the nerve root exits - Often combined with central canal narrowing ([lumbar spinal stenosis](/condition/lumbar-spinal-stenosis)) **3. Spondylolisthesis:** - Vertebral slippage narrowing the foramen - Most common at L4-L5 (degenerative) or L5-S1 (isthmic) **4. Other Causes:** - Synovial cyst of the facet joint - Epidural lipomatosis - Tumors (primary or metastatic) - Infections (osteomyelitis, epidural abscess) - Epidural hematoma (rare, usually post-procedure) **Risk Factors:** - Age 30-50 (peak for disc herniation) - **Smoking** — accelerates disc degeneration by 50-70% - Heavy occupational lifting or twisting - Sedentary lifestyle with prolonged sitting - Obesity — increases mechanical load - Family history of disc disease - Diabetes — accelerates disc degeneration - Previous lumbar injury or surgery

## Conservative Treatment (First-Line — 80-90% Success) **1. Education and Activity Modification:** - Reassurance that 80-90% improve without surgery - Stay active — bed rest beyond 1-2 days is harmful - Avoid prolonged sitting (worst position for discs) - Avoid heavy lifting and twisting movements - Apply ice/heat as preferred for symptom relief **2. Medications:** - **NSAIDs** (ibuprofen, naproxen, meloxicam) — first-line; 2-4 weeks for acute flares - **Short course oral corticosteroids** — methylprednisolone taper for severe acute cases - **Gabapentin or pregabalin** — for persistent neuropathic pain - **Muscle relaxants** — short-term for associated muscle spasm - **Avoid long-term opioids** — limited efficacy, significant risks **3. Physical Therapy:** - **McKenzie method** — directional preference exercises (often extension-based) for disc-related cases - **Core stabilization** — transversus abdominis activation, planks, bird-dogs - **Neural mobilization** — sciatic nerve gliding exercises - **Hip flexibility** — piriformis, hamstring stretches - **Gradual return to activity** — pain-monitored progression **4. Epidural Steroid Injection:** - Fluoroscopy-guided transforaminal injection — best for disc herniations - Provides 50-70% pain relief lasting 3-6 months - Useful for severe pain unresponsive to oral medications - Can be repeated 2-3 times per year - May improve outcomes when combined with PT **5. Behavioral and Psychological:** - Cognitive-behavioral therapy for chronic cases - Manage catastrophizing thoughts about pain - Address fear-avoidance behaviors - Mindfulness-based stress reduction ## Surgical Treatment (5-10% of Cases) **Indications:** - Failed 6-12 weeks of structured conservative treatment with significant pain - Progressive neurological deficit (worsening weakness or numbness) - Cauda equina syndrome (EMERGENCY surgery) - Foot drop (urgent surgery within 1-2 weeks ideal) - Intractable pain significantly affecting quality of life **Procedures:** - **Microdiscectomy** — gold standard for disc herniation; small incision; 85-95% success - **Laminectomy/foraminotomy** — for foraminal stenosis - **Endoscopic discectomy** — minimally invasive option, similar outcomes - **Spinal fusion** — for spondylolisthesis or instability (uncommon for radiculopathy alone) **Outcomes:** - 85-95% pain relief at 1-2 years - Faster pain relief than conservative treatment - 4-year outcomes equivalent to conservative treatment in most studies (SPORT trial) - Recurrence rate: 5-15% at the same level - Recovery: 1-2 weeks for desk work, 4-6 weeks for full activity