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Related Experiment Videos

Abnormal motion in spondylolytic spondylolisthesis.

Gregory Schneider1, Mark J Pearcy, Nikolai Bogduk

  • 1Department of Clinical Research, University of Newcastle, Royal Newcastle Hospital, Newcastle, Australia. greg@mona.com.au

Spine
|May 18, 2005
PubMed
Summary

Patients with spondylolisthesis exhibit abnormal lumbar spine motion, particularly in the quality of movement, not just magnitude. Analyzing instantaneous centers of rotation reveals these subtle, paradoxical movements in spinal segments.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Radiology

Background:

  • Lytic spondylolisthesis is often presumed unstable, yet studies lack evidence of abnormal motion magnitude.
  • Previous research overlooked abnormalities in the quality of lumbar spine motion.

Purpose of the Study:

  • To detect abnormal motion in spondylolisthesis patients using radiographic analysis.
  • To investigate the quality of lumbar spine motion in spondylolisthesis.

Main Methods:

  • Retrospective cohort study comparing 13 spondylolisthesis patients with 20 asymptomatic controls.
  • Analysis of lumbar spine kinematics, including instantaneous centers of rotation, translation, and sagittal rotation from flexion-extension radiographs.

Main Results:

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  • Abnormal motion was detected in 12 of 13 spondylolisthesis patients.
  • Most abnormalities involved abnormal motion quality, including paradoxical motion at the lytic segment.
  • Only one patient showed excessive translation at the lytic segment.

Conclusions:

  • A significant proportion of spondylolisthesis patients exhibit abnormal lumbar spine motion quality.
  • Instantaneous centers of rotation analysis is crucial for identifying abnormal motion quality in spondylolisthesis.