Degenerative Spinal Conditions

Overview of Degeneration - Wear & Tear Tales

• Progressive, age-related structural failure from chronic biomechanical stress ("wear & tear").
• Key targets: Intervertebral discs (IVD), facet joints, vertebral endplates, ligaments.
• Pathophysiology Highlights:
  • IVD: Initial ↓proteoglycans & water (nucleus pulposus) → ↓disc height, desiccation → annular tears, fissures → herniation.
  • Facet Joints (Zygapophyseal): Cartilage erosion → inflammation → osteophyte formation (spondylosis) → arthropathy, hypertrophy.
  • Ligaments: Hypertrophy (esp. ligamentum flavum), ossification.
• Clinical Sequelae: Segmental instability, nerve root impingement (radiculopathy), spinal stenosis, myelopathy, chronic axial pain.

⭐ Most common initial change in degenerative disc disease is loss of proteoglycans and water content in the nucleus pulposus.

Cervical Spondylosis - Cranky Neck Crisis

• Degenerative cascade affecting cervical discs, vertebrae, facet joints.
• Pathophysiology: Disc desiccation & collapse → osteophytes → ↓canal/foraminal space.
• Clinical Syndromes:
  • Axial Neck Pain: Chronic, activity-related.
  • Cervical Radiculopathy: Unilateral arm pain, paresthesia, weakness. Positive Spurling's test.
  • Cervical Myelopathy: Insidious onset. Gait disturbance (spastic), clumsiness, Lhermitte's sign, Hoffman's sign. Bowel/bladder changes late.
• Diagnosis:
  • X-ray: ↓Disc height, osteophytes, foraminal narrowing.
  • MRI: Definitive for neural compression.
• Management:
  • Conservative: NSAIDs, physiotherapy, cervical collar.
  • Surgical: Decompression (ACDF, laminectomy) for progressive myelopathy or failed conservative Rx for radiculopathy.

⭐ Nurick scale is commonly used to grade the severity of cervical spondylotic myelopathy.

Lumbar Degeneration - Low Back Breakdown

• Core Issues: Age-related wear & tear of lumbar discs, facets, ligaments. Leads to Low Back Pain (LBP), radiculopathy (e.g., sciatica), and/or neurogenic claudication.
• Key Conditions:
  • Disc Herniation: Nucleus pulposus extrusion. Common at L4-L5, L5-S1. Positive Straight Leg Raise (SLR).
  • Lumbar Spinal Stenosis (LSS): Central canal or foraminal narrowing.
  • Degenerative Spondylolisthesis: Anterior vertebral slippage, often L4-L5.
• Diagnosis: History, neuro exam. X-ray (osteophytes, ↓disc height). MRI is gold standard.

⭐ The "shopping cart sign" (symptoms improve with leaning forward) is characteristic of lumbar spinal stenosis.

• Management Approach:

Clinical Approach - Spine Sleuth & Fix

• History: Focus on red flags (📌 PINNT: Progressive deficit, Incontinence, Night pain/fever/weight loss, Numbness/weakness (new/progressive), Trauma). Pain: onset, character, radiation, aggravating/relieving factors.
• Exam:
  • Observe: Gait, deformity (scoliosis, kyphosis).
  • Palpate: Tenderness.
  • Assess: ROM.
  • Neuro: Motor (power 0-5), Sensory (dermatomes), Reflexes. Special tests (SLR, Lasegue's, Femoral stretch, Spurling's).
• Investigations:
  • X-ray: Initial (AP/Lat), dynamic views for instability.
  • MRI: Gold standard for discs, nerves, cord.
  • CT: For bony detail, fractures, severe stenosis.
• Management Principles:
  • Conservative: Rest, analgesia (NSAIDs), physiotherapy, epidural injections.
  • Surgical: Indications: progressive neuro deficit, intractable pain, instability, failure of conservative Rx.

    ⭐ Cauda equina syndrome is a surgical emergency requiring urgent decompression.

High‑Yield Points - ⚡ Biggest Takeaways

• Lumbar spondylosis is most common, affecting L4-L5 & L5-S1 levels.
• Cervical spondylosis presents with radiculopathy (nerve root) or myelopathy (cord compression).
• Neurogenic claudication, relieved by flexion, is key for lumbar spinal stenosis.
• MRI is the gold standard for diagnosis and assessing severity.
• Conservative management (rest, NSAIDs, physiotherapy) is the initial approach.
• Surgical decompression is for progressive neurological deficits or intractable pain.
• Degenerative spondylolisthesis commonly occurs at L4-L5.