Monday, April 23, 2007

Pars defect



Spondylolysis is a condition in which the there is a defect in a portion of the spine called the pars interarticularis (a small segment of bone joining the facet joints in the back of the spine). The pars interarticularis defect can be on one side of the spine only (unilateral) or both sides (bilateral). The most common level it is found is at L5-S1, although spondylolisthesis can occur at L4-5 and rarely at a higher level.

Spondylolysis is the most common cause of isthmic spondylolisthesis, in which one vertebral body is slipped forward over another.


References:
  • http://www.spine-health.com/topics/cd/spondy/spondy01.html
  • http://www.chirogeek.com/005_Spondylo-Slide-Show.htm

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