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Related Experiment Videos

Quantitative changes in spinal canal dimensions using interbody distraction for spondylolisthesis.

V Vamvanij1, L A Ferrara, Y Hai

  • 1Department of Orthopaedic Surgery, Siriraj Hospital, Mahidol University, Bangkok, Thailand.

Spine
|February 27, 2001
PubMed
Summary

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Interbody distraction implants, placed anteriorly or laterally, significantly increase spinal canal and neuroforaminal dimensions in cadaveric spines with degenerative spondylolisthesis.

Area of Science:

  • Spinal surgery
  • Orthopedic biomechanics
  • Neurosurgery

Background:

  • Degenerative spondylolisthesis often causes spinal stenosis.
  • Anterior interbody fusion is clinically successful, but the role of distraction in improving stenosis is unclear.

Purpose of the Study:

  • To quantify changes in spinal canal and neuroforaminal dimensions.
  • Evaluate interbody distraction devices in cadaveric lumbar spines with degenerative spondylolisthesis.

Main Methods:

  • Used 5 fresh cadaver lumbar spines with degenerative spondylolisthesis.
  • Simulated physiologic load, then inserted anterior or lateral interbody distraction implants.
  • Measured spinal canal and neuroforaminal volumes using CT scans and silicon molds.

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Main Results:

  • Anterior distraction increased canal area by 35.11% and volume by 19.92%.
  • Lateral distraction increased canal area by 33.14% and volume by 21.96%.
  • Both methods significantly enhanced left foraminal volume (approx. 40-41%).

Conclusions:

  • Interbody distraction, anterior or lateral, immediately improves spinal canal area and volume.
  • This technique also increases neuroforaminal volume in degenerative spondylolisthesis.