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Published in: European Spine Journal 6/2015

01-06-2015 | Original Article

Pelvic retroversion is the key protective mechanism of L4–5 degenerative spondylolisthesis

Authors: Hui Liu, Sibei Li, Zhaomin Zheng, Jiranru Wang, Huafeng Wang, Xiang Li

Published in: European Spine Journal | Issue 6/2015

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Abstract

Purpose

To explore the role of spinopelvic sagittal alignment in the pathological mechanism of degenerative spondlylolisthesis (DS) development.

Method

A total of 52 asymptomatic volunteers, 32 single segment L4–5 DS and 29 lumbar spinal stenosis (LSS) without spondylolisthesis patients were enrolled. All subjects had standard lumbar spine X-ray films with standard position along with lumbar spine magnetic resonance image. Comparative analysis of sagittal parameters and disc degeneration grades among asymptomatic volunteers and patients with the two disorders were performed.

Results

Compared to normal population (NP) and LSS, DS showed significantly greater pelvic incidence (PI), sacral slope (SS) and lumbar lordosis (LL), while LSS showed significantly smaller PT and PT/SS. DS showed significantly greater L5 slope than NP and LSS. In both Great-PI group and Small-PI group, all above differences between DS and LSS remained. LSS showed significantly higher degenerative grade of each adjacent disc than DS. Population with adjacent segment degeneration showed higher incidence of pelvic retroversion (PT/SS ≥1), and LSS showed greater proportion of adjacent segment degeneration than DS.

Conclusions

Lumbar spine morphology of great LL determined by great PI is a risk factor of L4–5 DS. L5 slope is a parameter that can be used to predict the risk of L4–5 DS. Pelvic retroversion is the key protective mechanism from DS. Adjacent segment degeneration is a driving factor of pelvic retroversion for compensation of lumbar sagittal malalignment.
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Metadata
Title
Pelvic retroversion is the key protective mechanism of L4–5 degenerative spondylolisthesis
Authors
Hui Liu
Sibei Li
Zhaomin Zheng
Jiranru Wang
Huafeng Wang
Xiang Li
Publication date
01-06-2015
Publisher
Springer Berlin Heidelberg
Published in
European Spine Journal / Issue 6/2015
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI
https://doi.org/10.1007/s00586-014-3395-7

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