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. 2011 Apr 5;12:69. doi: 10.1186/1471-2474-12-69

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Copyright ©2011 Kim et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Patients with degenerative spondylolisthesis (DSPL) are characterized by an increased pelvic tilt (PT) and decreased sacral slope (SS) than the control population, suggesting the presence of a pelvic compensation (center). Additionally, Disc degeneration and slippage at the DSPL level led to an anterior sagittal imbalance with anterior displacement of the C7 plumb line (green arrows). In the DSPL patients achieved optimal lumbar lordosis (LL) after surgery, the pelvis backtilt (decreased PT) and anterior displacement of the axis of gravity is improved (left). In the DSPL patients of hypolordotic reduction, we suppose that the aggravating pelvis backtilt (more increased PT) permits the limiting of the anterior displacement of the axis of gravity as well as hyperextension and retrolisthesis (arrow head) observed in the upper lumbar spine (right).