spondylolisthesis

spondylolisthesis /spon·dy·lo·lis·the·sis/ (-lis´the-sis) forward displacement of a vertebra over a lower segment, usually of the fourth or fifth lumbar vertebra due to a developmental defect in the pars interarticularis.spondylolisthet´ic

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spon·dy·lo·lis·the·sis (spndl--ls-thss)

n.

Forward displacement of one of the lower lumbar vertebrae over the vertebra below it or over the sacrum.

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spondy·lo·lis·thetic (-thtk) adj.

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spondylolisthesis

[spon′dilō′listhē′sis]

Etymology: Gk, sphondylos + olisthanein, to slip

the partial forward dislocation of one vertebra over the one below it, most commonly the fifth lumbar vertebra over the first sacral vertebra. Severity of spondylolisthesis is classified by percentage of slip. See also spinal cord compression.

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spondylolisthesis [spon″dĭ-lo-lis-the´sis]

forward displacement of a vertebra over a lower segment due to a congenital defect or fracture in the pars interarticularis, usually of the fifth lumbar over the sacrum, or of the fourth lumbar over the fifth. adj., adj spondylolisthet´ic.

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spondylolisthesis (spônˈ·d·lō·lisˑ·th·sis),

n anterior slippage of a vertebra relative to the vertebra immediately below.

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spondylolisthesis

forward displacement of a vertebra over a posterior segment due to a congenital defect or fracture in the pars interarticularis. Occurs in the giant breeds of dogs as wobbler syndrome and as a developmental defect called kinky back in broiler chickens. Affected birds are unable to stand normally and may be completely paralyzed. The causative lesion is a deformity of the sixth thoracic vertebra but the cause of the defect is unknown.

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spondylolisthesis

Orthopedics The forward slippage of a lumbar vertebra on the vertebra inferior thereto, which usually involves lumbar vertebra, most often at the level between the 5^th lumbar vertebra and the 1^st sacral vertebra; ranges from mild to severe Etiology Congenital defect in 5^th lumbar vertebra, stress fractures, traumatic fractures, bone diseases; it may be associated with and produce lordosis Clinical Low back pain and pain in thighs and buttocks, stiffness, muscle tightness, tenderness in slipped area, paresthesias, sciatica due to nerve root compression