21 - Spondylolisthesis - D3

21 - Spondylolisthesis - D3 - Spondylolisthesis Done By :...

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Spondylolisthesis Done By : Aliaa Hassan
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Spondylolisthesis Definition The term "Spondylolisthesis" refers to a condition where one of the vertebrae (usually L5) becomes misaligned anteriorly (slips forward) in relation to the vertebra below. This forward slippage is caused by a problem or defect within the pars interarticularis. Occasionally, facet joint and/or posterior neural arch defects may also cause this syndrome as well. The forward slippage does NOT always occur. This non- slipped pars defect is called a "Spondylolysis" and is almost always a precursor to the actual forward slippage.
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Spondylolisthesis
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Spondylolisthesis
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Developmental anatomy The first theory proposed a failure of ossification during embryonic development, leading to a pars interarticularis defect at birth The second theory demonstrated that the pars defect began to appear around age six and became progressively more common till age 16. After age 16, the incidence fell and rarely developed after adolescence It is currently thought that the defect develops from small stress fractures that fail to heal and form a chronic nonunion.
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Classification Dysplastic spondylolisthesis Isthmic spondylolisthesis DEGENERATIVE SPONDYLOLISTHESIS TRAUMATIC SPONDYLOLISTHESIS PATHOLOGICAL SPONDYLOLISTHESIS IATROGENIC SPONDYLOLISTHESIS
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Dysplastic spondylolisthesis Is a true congenital spondylolisthesis that occurs because of malformation of the lumbosacral junction with small, incompetent facet joints. Very rare, but tends to progress rapidly Often associated with more severe neurological deficits.
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Isthmic spondylolisthesis SUB-TYPE A: Is the most commonly found type of spondylolisthesis in people under 50 years of age. It is believed that "biomechanical stress," such as repetitive mechanical strain from heavy work or sports, causes a fatigue fracture within the pars interarticularis.
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Isthmic spondylolisthesis SUB-TYPE B: This type of Isthmic spondylolisthesis is characterized by a elongated pars without separation. It is believed that the elongation occurs secondary to "repeated,
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This note was uploaded on 12/24/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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21 - Spondylolisthesis - D3 - Spondylolisthesis Done By :...

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