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Related Experiment Videos

Neck kinematics in rear-end impacts.

King H Yang1, Albert I King

  • 1Wayne State University, Detroit, United States. yang@eng.wayne.edu

Pain Research & Management
|July 25, 2003
PubMed
Summary

This study investigated neck movement during low-speed rear-end impacts. Findings reveal complex cervical spine kinematics and significant facet joint capsule stretch, suggesting facet capsules are a likely pain source in whiplash injuries.

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Area of Science:

  • Biomechanics
  • Spinal Cord Injury Research
  • Automotive Safety

Background:

  • Low-speed rear-end impacts are a common cause of whiplash injuries.
  • Understanding cervical spine kinematics is crucial for injury prevention and mitigation.

Purpose of the Study:

  • To document the detailed kinematics of the human cervical spine during low-speed rear-end impacts.
  • To identify key biomechanical factors contributing to whiplash injuries.

Main Methods:

  • Experiments utilized six cadavers instrumented with markers and accelerometers.
  • Cervical spine motion was recorded using a 250-Hz X-ray system.
  • Acceleration data were digitized at 10,000 Hz.

Main Results:

  • Head and cervical vertebrae extended globally; upper segments flexed locally, lower segments extended.
  • Facet joint capsular stretch ranged from 17% to 97%.
  • Upward torso ramping increased with a 20-degree seatback angle.

Conclusions:

  • Neck kinematics in rear-end impacts are complex, influenced by thoracic spine rotation.
  • Significant posterior shear deformation, indicated by facet capsular stretch, occurs.
  • Facet capsule stretch, not the S-shaped curve, is the likely source of whiplash pain.

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