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How does posture affect coupling in the lumbar spine?

M Panjabi1, I Yamamoto, T Oxland

  • 1Department of Orthopaedics and Rehabilitation, Yale University, School of Medicine, New Haven, Connecticut.

Spine
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

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Abnormal lumbar spine coupling patterns may indicate low-back issues. This study quantified normal patterns in cadavers, revealing significant variations across spinal levels and postures.

Area of Science:

  • Biomechanics
  • Spinal Anatomy
  • Orthopedics

Background:

  • Abnormal coupling patterns in the lumbar spine are linked to low-back problems.
  • Quantifying normal spinal coupling is crucial for understanding these issues.

Purpose of the Study:

  • To quantify normal lumbar spine coupling patterns in fresh cadavers.
  • To analyze how coupling patterns vary with intervertebral level and spinal posture.

Main Methods:

  • Used fresh human cadaveric lumbar spine specimens (L1-S1).
  • Applied pure axial torque or lateral bending moments (10 N-m) in five equal steps.
  • Measured 3D motions at five vertebral levels across five spinal postures.

Main Results:

Related Experiment Videos

  • Coupling patterns varied significantly between intervertebral levels.
  • Left axial torque produced coupled lateral bending (e.g., 2° R at L1-2 to 2.5° L at L5-S1) and flexion (1°-2°).
  • Left lateral bending induced coupled axial rotation (1.7° R, except L1-2) and flexion (0.7°-2°).

    • Conclusions:

    • Lumbar spine coupling is level-dependent and posture-influenced.
    • Established baseline data for normal coupling patterns.
    • Findings contribute to understanding biomechanics of low-back pain.