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Related Experiment Videos

Posture affects motion coupling patterns of the upper cervical spine

M M Panjabi1, T Oda, J J Crisco

  • 1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, CT 06510.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|July 1, 1993
PubMed
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Posture significantly alters upper cervical spine motion, particularly coupled sagittal rotation. Understanding these changes is crucial for diagnosing instability from degeneration or trauma.

Area of Science:

  • Biomechanics
  • Spinal Anatomy
  • Orthopedics

Background:

  • Cervical spine motion analysis aids in diagnosing instability from degenerative changes and trauma.
  • Understanding posture's effect on upper cervical spine (C0-C3) motion is vital for accurate interpretation.

Purpose of the Study:

  • To investigate the influence of sagittal plane postures (flexion, neutral, extension) on the three-dimensional motions of the upper cervical spine (C0-C1 and C1-C2).

Main Methods:

  • Utilized seven fresh human cadaveric C0-C3 spinal specimens.
  • Applied axial torques and lateral bending moments (up to 1.5 Nm) in three postures.
  • Measured three-dimensional relative motions using non-constraining stereophotogrammetry.

Main Results:

Related Experiment Videos

  • Load-displacement curves were nonlinear.
  • Coupled sagittal plane rotation dramatically changed with posture, reversing direction from extension to flexion.
  • Axial torque effects on axial rotation and coupled lateral bending showed minimal postural change.
  • Lateral bending moment effects showed decreased main and coupled rotations, with coupled axial rotation reversing direction in flexion.

Conclusions:

  • Posture significantly impacts upper cervical spine biomechanics, especially coupled sagittal plane rotations.
  • These findings are critical for interpreting motion measurements in diagnosing cervical spine instability.