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retrolisthesis
Pronunciation: RET-roh-lis-THEE-sis
Backward displacement of a vertebra relative to the vertebra below it.
Full Definition
Retrolisthesis occurs when a vertebra slips posteriorly (backward) in relation to the vertebra beneath it, opposite to the forward slip seen in spondylolisthesis. This condition can result from degenerative changes, trauma, or congenital abnormalities. The displacement is graded similarly to spondylolisthesis, with Grade I representing less than 25% displacement. Retrolisthesis can cause spinal canal narrowing and nerve root compression, particularly affecting the neural foramina.
Usage
Usage note: Specify direction of slip to distinguish from spondylolisthesis.
In Context
- "Grade II retrolisthesis of L3 on L4 was evident on the lateral radiograph." — Radiology report
- "The patient's symptoms were attributed to neural compression secondary to retrolisthesis." — Clinical assessment
Also known as
posterior displacement
backward slip
Contrasted with
anterolisthesis
spondylolisthesis
Don't confuse with
spondylolisthesis
lateral listhesis