Thoracic and lumbar fractures and dislocations

Background

• Injury to thoracic spine necessitates severe force
  • When spinal cord injury occurs usually complete
• Stable if two or more of the spinal columns are intact:
  • Anterior (anterior longitudinal ligament, annulus fibrosus, ant. half of the vertebral body)
  • Middle (posterior longitudinal ligament, posterior annulus fibrous, and post. half of vertebral body
  • Posterior (supraspinous and interspinous ligaments, facet joint capsule)
• Unstable if:
  • 50% loss of vertebral height
  • Kyphotic angulation around the fx:
    • >30' for compression fx
    • > 25' for burst fracture
  • Neurologic deficit

Classification

Compression (wedge)

• Only unstable if posterior ligament complex ruptures (requires a rotational force)
• Suspect instability and obtain CT if:
  • Severe compression (>50% loss of vertebral height)
  • Kyphosis >30deg
  • Rotational component to injury
  • Compression fracture at multiple sites
  • Posterior cortex abnormality

Flexion-Distraction Injuries (lap belt)

• Unstable
• Intra-abdominal injuries more commonly associated than neuro deficits
• Obtain sagittally reconstructed CT if suspect lap-belt mechanism or flexion-distraction

Chance Fracture

• most common at T12-L2 due to spinal curvature and mechanism
• Unstable
• Seat Belt Injury: lap belt worn above the pelvic bones without a shoulder harness
  • Forceful flexion at lap belt leads to compression fracture of ant and middle columns
  • Associated with intra-abdominal injury (rectus sheath hematoma, intestinal perforation)
    • One or both articular processes fracture > upper vertebrae anterior dislocates/subluxation

• Imaging
  • anterior vertebral body compression fracture with extension through middle of vertebral body into posterior wall
  • Compression fracture + increased posterior interspinous spaces caused by distraction

• Management
  • type and screen/cross, labs including pancreatic enzymes if thoraco-lumbar location
  • consult ortho or neurosurgery (institution dependent)
  • spinal precautions
  • emergency operative repair unless medically unstable

Translational

• Massive direct trauma to the back > failure of all 3 columns
• Almost invariably demonstrate neuro deficits

Differential Diagnosis

Lower Back Pain

• Spine related
  • Acute ligamentous injury
  • Acute muscle strain
  • Disk herniation (Sciatica)
  • Degenerative joint disease
  • Spondylolithesis
  • Epidural compression syndromes
    • Spinal cord compression (non-traumatic)
    • Cauda equina syndrome
    • Conus medullaris syndrome
    • Epidural abscess (spinal)
    • Epidural hematoma (spinal)
  • Thoracic and lumbar fractures and dislocations
  • Cancer metastasis
  • Spinal stenosis
  • Transverse myelitis
  • Vertebral osteomyelitis
  • Ankylosing spondylitis
  • Spondylolisthesis
  • Discitis
  • Spinal Infarct
• Renal disease
  • Kidney stone
  • Pyelonephritis
  • Nephrolithiasis
• Intra-abdominal
  • Abdominal aortic aneurysm
  • Ulcer perforation
  • Retrocecal appendicitis
  • Large bowel obstruction
  • Pancreatitis
• Pelvic disease
  • PID
• Other
  • Retroperitoneal hemorrhage/mass
  • Meningitis

Management

LUMBAR

• Stable Fractures - TLSO brace as directed by Neurosurg

CT IF:

• Compression
• Wedge
• >50% height (r/o middle column & burst)

See Also

• Spinal Cord Trauma
• Vertebral fractures