alexa Mechanism of cervical spinal cord injury during bilateral facet dislocation.
General Science

General Science

Journal of Forensic Biomechanics

Author(s): Ivancic PC, Pearson AM, Tominaga Y, Simpson AK, Yue JJ,

Abstract Share this page

Abstract STUDY DESIGN: An in vitro biomechanical study. OBJECTIVES: The objectives were to: quantify dynamic canal pinch diameter (CPD) narrowing during simulated bilateral facet dislocation of a cervical functional spinal unit model with muscle force replication, determine if peak dynamic CPD narrowing exceeded that observed post-trauma, and evaluate dynamic cord compression. SUMMARY OF BACKGROUND DATA: Previous biomechanical models are limited to quasi-static loading or manual ligament transection. No studies have comprehensively analyzed dynamic CPD narrowing during simulated dislocation. METHODS: Bilateral facet dislocation was simulated using 10 cervical functional spinal units (C3-C4: n = 4; C5-C6: n = 3; C7-T1: n = 3) with muscle force replication by frontal impact of the lower vertebra. Rigid body transformation of kinematic data recorded optically was used to compute the CPD in neutral posture (before dislocation), during dynamic impact (peak during dislocation), and post-impact (flexion rotation = 0(0) degrees ). Peak dynamic impact and post-impact CPD narrowing were statistically compared. RESULTS: Average peak dynamic impact CPD narrowing significantly exceeded (P < 0.05) post-impact narrowing and occurred as early as 71.0 ms following impact. The greatest dynamic impact narrowing of 7.2 mm was observed at C3-C4, followed by 6.4 mm at C5-C6, and 5.1 mm at C7-T1, with average occurrence times ranging between 71.0 ms at C7-T1 and 97.0 ms at C5-C6. CONCLUSION: Extrapolation of the present results indicated dynamic spinal cord compression of up to 88\% in those with stenotic canals and 35\% in those with normal canal diameters. These results are consistent with the wide range of neurologic injury severity observed clinically due to bilateral facet dislocation. This article was published in Spine (Phila Pa 1976) and referenced in Journal of Forensic Biomechanics

Relevant Expert PPTs

Relevant Speaker PPTs

  • Daniel S Peiffer
    Dietary consumption of black raspberries or their anthocyanin constituents alters innate immune cell trafficking in esophageal cancer
    PDF Version
  • Ali Can Yilmaz
    PPT Version | PDF Version
  • Tamar Ben-Bassat
    PPT Version | PDF Version
  • Irfan Ali Khan
    Understanding basic biostatistics for proper application of statistical methods
    PPT Version | PDF Version
  • A R Moldenke
    Pollination community structure revisited: a critical examination of networking statistics and a proposed modeling technique to permit cross-site networking comparisons of field data
    PPT Version | PDF Version
  • Jasmina N Jovanovic
    GABAA receptor binding partners in the ER: a role in trafficking to the cell surface
    PDF Version
  • Monica V Marquezini
    Genotoxic risk for workers from São Paulo city, Brazil, due to occupational exposure to traffic air pollution
    PDF Version

Recommended Conferences

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version