Pars interarticularis defect

Case contributed by Mohammad Osama Hussein Yonso


The patient complains of upper thoracic and low backache for 5 days, after a history of lifting a heavy object.

Patient Data

Age: 45 years
Gender: Male

Anterior displacement of L5 vertebral body relative to S1 with pars interarticularis (spondylolisthesis grade II).

Decreased disc space height of the L5-S1 level.

Mild wedging of the L1 vertebral body.

Case Discussion

Meyerding classification system of spondylolisthesis is: 1

  • grade I: 0-25%
  • grade II: 26-50% 
  • grade III: 51-75% 
  • grade IV: 76-100%  
  • grade V (spondyloptosis): >100%

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