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Related Experiment Videos

Posterior lumbar interbody cages do not augment segmental biomechanical stability.

J R Dimar1, D J Beck, S D Glassman

  • 1Department of Orthopaedic Surgery, University of Louisville, Kentucky, USA.

American Journal of Orthopedics (Belle Mead, N.J.)
|August 25, 2001
PubMed
Summary

Posterior threaded interbody cages did not significantly increase lumbar spine stiffness. Supplemental pedicular screw/rod instrumentation, however, did improve stiffness, questioning the stability benefits of cages alone.

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Area of Science:

  • Orthopedic Surgery
  • Spinal Biomechanics
  • Neurosurgery

Background:

  • Posterior lumbar interbody fusion is a common surgical procedure.
  • Threaded interbody cages are frequently used to achieve fusion and provide stability.
  • The biomechanical contribution of these cages to overall spinal stability is debated.

Purpose of the Study:

  • To evaluate the effect of posterior threaded interbody cages on lumbar spine stiffness.
  • To compare the stiffness provided by cages alone versus cages with supplemental instrumentation.

Main Methods:

  • Fresh human cadaveric spine specimens (L4-L5) were utilized.
  • Testing involved various ranges of motion to assess stiffness.
  • Stiffness was measured with and without posterior threaded interbody cages and with supplemental pedicular screw/rod instrumentation.

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Main Results:

  • Posterior threaded interbody cages did not significantly increase spine stiffness in any tested range of motion.
  • Supplemental posterior pedicular screw/rod instrumentation significantly increased spine stiffness.

Conclusions:

  • The use of posterior threaded interbody cages as isolated posterior implants may not significantly enhance lumbar spine stability.
  • Supplemental posterior instrumentation is crucial for increasing spinal stiffness in this context.