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Causes Of Low Back Pain

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Spondylolistesis

Spondylolisthesis occurs when one lumbar vertebra slips forward in relationship to the adjacent vertebra. In the Greek language, the term spondylolisthesis means slipped vertebra. The neural arch (lamina) and the paired facet joints are anatomical structures that prevent vertebrae from slipping (Fig 1). A vertebra may slip following the development of a stress fracture through the neural arch. The defect in the lamina separates the back part of the vertebra from the remaining part; the vertebral body and disc. The stabilizing role of the paired facet joints is lost and the vertebral body slips forward. The laminar stress fracture (in Greek called spondylolysis) occurs in a specific region of the lamina called the pars interarticularis or isthmus. Hence the condition is called isthmic spondylolisthesis.

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