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Instability in spondylolisthesis.

O Friberg1

  • 1Research Institute of Military Medicine, Central Military Hospital, Helsinki, Finland.

Orthopedics
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

Anteroposterior translation on radiography indicates lumbar instability in spondylolisthesis. Pain severity correlates with instability, not static displacement, and load affects vertebral movement.

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Area of Science:

  • Orthopedics
  • Spine Surgery
  • Radiology

Background:

  • Segmental instability is a key factor in lower back pain.
  • Spondylolisthesis, particularly lytic or degenerative types, often presents with instability.
  • Understanding the biomechanics of instability is crucial for effective treatment.

Purpose of the Study:

  • To investigate anteroposterior translation as a radiographic marker for lumbar segmental instability in spondylolisthesis.
  • To correlate the severity of lower back pain with the degree of instability and static displacement.
  • To analyze the viscoelastic behavior of unstable spondylolistheses under load.

Main Methods:

  • Traction-compression radiography was used to assess anteroposterior translation in lumbar segments.

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  • Patients with lytic or degenerative spondylolisthesis and normal disc height were included.
  • Viscoelastic properties, including creep, were measured under varying load conditions.

    • Main Results:

    • Anteroposterior translation was observed in most lumbar segments with lytic or degenerative spondylolisthesis.
    • Lower back pain severity correlated with instability, not static spondylolisthetic displacement.
    • Unstable spondylolistheses demonstrated reduced viscoelasticity and creep, with displacement dependent on load and duration.
    • Disc degeneration and traction spurs appeared to have a stabilizing effect.

    Conclusions:

    • Anteroposterior translation on traction-compression radiography is a reliable sign of lumbar segmental instability in spondylolisthesis.
    • Instability, rather than static displacement, is the primary driver of pain severity in these cases.
    • Load-dependent vertebral displacement and reduced viscoelasticity characterize unstable spondylolistheses.
    • Disc degeneration and traction spurs may offer a stabilizing influence on spondylolisthesis.