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Related Experiment Videos

Changes in segmental intervertebral motion adjacent to cervical arthrodesis: a prospective study.

Charles A Reitman1, John A Hipp, Lyndon Nguyen

  • 1Department of Orthopedic Surgery, Baylor College of Medicine, Houston, Texas, USA. creitman@bcm.tmc.edu

Spine
|May 29, 2004
PubMed
Summary

Cervical fusion does not significantly alter adjacent intervertebral motion on average within the first year. While some patients show individual changes, overall motion and degeneration are not consistently affected by spinal fusion in the early postoperative period.

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Area of Science:

  • Spine surgery
  • Orthopedics
  • Biomechanical analysis

Background:

  • Anterior cervical fusion is associated with adjacent segment disease.
  • Spinal fusion may increase stress and compensatory motion at adjacent levels.
  • Existing research on adjacent motion changes after fusion is conflicting and often based on in vitro or retrospective data.

Purpose of the Study:

  • To prospectively quantify changes in intervertebral motion adjacent to cervical arthrodesis over time.
  • To investigate the relationship between adjacent motion and degenerative changes post-fusion.

Main Methods:

  • Prospective, observational study design.
  • Dynamic fluoroscopic studies before and after anterior cervical discectomy and fusion.
  • Validated software analysis of imaging data to calculate intervertebral motion (shear, flexion-extension, vertical displacement).

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Main Results:

  • Analysis of 21 patients with a mean follow-up of 13 months.
  • No significant average change in intervertebral motion adjacent to the fusion was observed.
  • Individual variations in motion changes were noted, but no consistent pattern emerged within the first 1-2 years.

Conclusions:

  • Average junctional intervertebral motion remains stable up to 13 months post-cervical fusion.
  • Significant changes in adjacent motion, if they occur, may not be apparent in the initial 1-2 years after surgery.
  • No correlation was found between adjacent intervertebral motion and the development of degenerative changes during the study period.