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Related Experiment Videos

Large compressive preloads decrease lumbar motion segment flexibility.

J Janevic1, J A Ashton-Miller, A B Schultz

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor 48109.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|March 1, 1991
PubMed
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Increased spinal compression significantly reduces lumbar motion segment flexibility in bending, shear, and torsion. This finding is crucial for understanding trunk load-sharing during strenuous activities.

Area of Science:

  • Biomechanics
  • Spinal Mechanics
  • Orthopedics

Background:

  • The lumbar spine's passive resistance is critical for load-sharing during physical tasks.
  • Understanding how compressive loads affect spinal flexibility is essential for injury prevention and rehabilitation.

Purpose of the Study:

  • To quantify the effects of varying compressive preloads on the bending, shear, and torsion flexibilities of intact adult lumbar motion segments.

Main Methods:

  • Tested 13 intact adult lumbar motion segments under 0, 2,200, and 4,400 N compressive preloads.
  • Applied forces and moments up to 160 N and 16 Nm to the upper end plate.
  • Measured flexibility in seven test directions.

Main Results:

Related Experiment Videos

  • A 2,200 N compressive preload significantly decreased motion segment flexibility in all tested directions (p < 0.06).
  • Flexibility decreased 2.6x in bending, 4.5x in axial torsion, and 6.1x in shear compared to no preload.
  • Higher preloads further reduced flexibility.

    • Conclusions:

    • Compressive loads substantially alter the passive resistance of the lumbar spine.
    • Future studies on trunk load-sharing during strenuous activities must account for these preload-induced changes in spinal flexibility.