PPT Slide

• Has essentially replaced CT and myelograms for initial evaluations

• Boden study 1990 JBJS:

  • 20 % of asymptomatic population less than 60 years with “HNP”
  • 36 % of asymptomatic population of 60 years

• Jensen study 1995 NEJM:

  • 52 % of asymptomatic patients with disc bulge at one or more levels
  • 27 % of asymptomatic patients with disc protrusion
  • 1 % of asymptomatic patients with disc extrusion

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