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Related Experiment Videos

Is there instability in spondylolisthesis?

M Pearcy, J Shepherd

    Spine
    |March 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Symptomatic spondylolisthesis reduces lumbar spine mobility and causes coupled movements, but does not create instability at the slip site. This study analyzed 3D intervertebral movements in patients versus normal subjects.

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    Area of Science:

    • Orthopedics
    • Biomechanics
    • Radiology

    Background:

    • Symptomatic spondylolisthesis is a condition affecting the lumbar spine.
    • Understanding intervertebral movement is crucial for diagnosing spinal instability.

    Purpose of the Study:

    • To investigate three-dimensional (3D) intervertebral movements in patients with symptomatic spondylolisthesis.
    • To compare these movements with those in healthy individuals to identify signs of instability.

    Main Methods:

    • Biplanar radiography was employed to capture patient movements.
    • Three-dimensional analysis examined intervertebral translations, lateral bending, and axial rotation during flexion and extension.

    Main Results:

    • Symptomatic spondylolisthesis led to decreased mobility across all lumbar spine levels.

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  • Coupled movements (lateral bending and axial rotation) were observed at higher lumbar levels.
  • No evidence of instability at the specific level of the spondylolisthesis slip was found.

    • Conclusions:

    • Symptomatic spondylolisthesis alters spinal biomechanics, causing reduced mobility and coupled movements.
    • The findings suggest that instability is not a characteristic feature at the slip site in these patients.