Traction Therapy: Cervical & Lumbar Applications

Introduction to Spinal Traction Therapy

Spinal traction is a therapeutic technique that applies a longitudinal pulling force to the spine to distract (separate) the vertebrae, widen the intervertebral foramina, and stretch surrounding muscles and ligaments. It is a key non-surgical treatment option for managing radiating nerve pain in the arms or legs, commonly caused by herniated discs, degenerative disc disease, or spinal stenosis.

Within a comprehensive program of physiotherapy and pain management, traction therapy is used to reduce acute nerve root compression, creating a pain-free window that allows patients to progress to active core stabilization and posture correction exercises.

Biomechanical Effects of Traction

When a calculated pulling force is applied to the spine, it produces several beneficial biomechanical changes:

1. Reduces Intradiscal Pressure: The separation of the vertebrae creates a negative pressure (a vacuum effect) within the disc. This suction helps draw protruding or herniated disc material back toward the center, reducing pressure on adjacent nerve roots.
2. Widens the Intervertebral Foramen: Increasing the space between vertebrae opens the bony canals through which spinal nerves exit, immediately reducing compression on pinched nerves (such as the sciatic nerve in the lower back).
3. Stretches Spinal Soft Tissues: Traction gently stretches tight spinal muscles and ligaments, helping to relieve protective muscle spasms and improve joint mobility.
4. Mobilizes Facet Joints: The sliding motion separates the small joints of the spine, helping to restore normal joint gliding.

Cervical Traction: Clinical Parameters

Cervical (neck) traction is utilized to treat cervical radiculopathy (pinched nerves in the neck causing pain, numbness, or tingling down the arm). Proper parameters are critical to isolate the target segments safely:

• Angle of Pull: To target the lower cervical spine (C5–C7), where most disc herniations occur, the head must be positioned in 20 to 25 degrees of flexion. A straight, neutral pull (0 degrees) only targets the upper cervical spine (C1–C2).
• Pulling Force: The initial pulling force should start low, at 10 to 15 pounds (approx. 7–10% of body weight), to allow the muscles to relax. This can be gradually increased to 20–25 pounds over subsequent sessions. A force exceeding 30 pounds should be avoided to prevent ligament strain.
• Mode: Can be continuous (constant pull) or intermittent (alternating pull and rest cycles, e.g., 30 seconds on, 10 seconds off). Intermittent traction is generally preferred for joint mobilization and comfort.

Lumbar Traction: Clinical Parameters

Lumbar (lower back) traction is used to treat lumbar radiculopathy, commonly known as sciatica (radiating leg pain). Because the lower body is heavy, mechanical parameters must be set higher to overcome friction and achieve joint distraction:

• The Split Table: Lumbar traction must be performed on a split table. The lower half of the table is unlocked during treatment, allowing it to slide. This eliminates the friction of the patient's body weight against the table, ensuring the entire pulling force is transferred directly to the lumbar spine.
• Pulling Force: To achieve actual separation of the lumbar vertebrae, the pulling force must be at least 50% of the patient's body weight (e.g., 80 pounds of force for a 160-pound patient). Initial sessions start at 25–30% of body weight to test patient tolerance and muscle relaxation.
• Harness Placement: Secure pelvic and thoracic harnesses are applied. The pelvic harness is placed just above the pelvic crests (iliac crests) to anchor the pull, while the thoracic harness stabilizes the upper body.

Comparison Table: Cervical vs. Lumbar Mechanical Traction

| Mechanical Parameter | Cervical Traction | Lumbar Traction | | :--- | :--- | :--- | | Patient Position | Supine, head supported in halter | Supine (knees bent) or Prone (for posterior herniations) | | Angle of Pull | 20° - 25° of flexion (for lower cervical) | 15° - 30° flexion (determined by pelvic harness angle) | | Pulling Force (Initial) | 10 - 15 lbs (7% - 10% body weight) | 25% - 30% of body weight | | Pulling Force (Therapeutic) | 20 - 25 lbs | 50% of body weight (requires split table) | | Primary Indication | Cervical radiculopathy, neck muscle spasms | Sciatica, lumbar disc herniation, stenosis | | Mode Selection | Intermittent (comfortable, relaxes muscles) | Intermittent (for disc issues) or Continuous (for muscle strain) |

Contraindications and Safety Boundaries

Traction is a powerful tool, but it can be harmful if applied to unstable or weakened spinal structures. Absolute contraindications include:

• Spinal Instability: Fractures, subluxations, or ligament instability (e.g., rheumatoid arthritis affecting the cervical spine).
• Severe Osteoporosis: Weakened bones cannot withstand the tensile forces and may fracture.
• Spinal Cord Compression: Direct pressure on the spinal cord (myelopathy) requires surgical evaluation rather than traction.
• Pregnancy: Lumbar traction harnesses compress the abdomen and are strictly contraindicated.
• Cardiovascular Disease: The abdominal pressure from lumbar traction harnesses can alter blood pressure, making it unsafe for patients with uncontrolled hypertension or severe heart disease.