Skeletal Trauma > Lumbar Spine > Spondylolysis


Spondylolysis

Spondylolysis

  • Spondylolysis is a bony defect of the pars interarticularis.
  • It happens most often in adolescent athletes and at the L5 vertebrae.
  • The defect results in formation of a "collar" around the Scotty Dog Model of the lumbar vertebrae.
The Scotty Dog Model of the lumbar spine

Spondylolysis


  • Spondylolisthesis is the anterior slippage of the vertebral column relative to an adjacent inferior vertebra.
  • Spondylolisthesis is usually a result of bilateral spondylolysis and most commonly occurs at the L4-5 or L5-S1 level.
  • Look carefully at the location of the spinous process step off to assess for spondylolisthesis.
Spondylolisthesis




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