Types of Spondylolisthesis

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  Type                       Age                           Pathology / Other

  Congenital               Child             Congenital dysplasia of S1 superior facet
  Isthmic                   5-50             Most Common; Predisposition leading to
                                                          elongation/Fx of pars (L5-S1)
  Degenerative           Older           Facet arthrosis leading to subluxation- L4/5
  Traumatic               Young           Acute fracture other than pars;
  Pathologic               Any               Incompetence of bony elements
  Post surgical           Adult             Excessive resection of neural arches/facets;

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