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Intervertebral neck injury criterion for simulated frontal impacts
Paul C Ivancic1, Shigeki Ito, Manohar M Panjabi
1Biomechanics Research Laboratory, Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut, USA.
Traffic Injury Prevention
|July 16, 2005
Summary
The Intervertebral Neck Injury Criterion (IV-NIC) effectively identifies soft tissue neck injuries from frontal impacts. This criterion is more precise than the Neck Injury Criterion (NIC) for detecting specific intervertebral damage.
Area of Science:
- Biomechanics
- Injury Biomechanics
- Spinal Injury
Background:
- The Neck Injury Criterion (NIC) hypothesizes neural injury from spinal fluid pressure changes.
- The Intervertebral Neck Injury Criterion (IV-NIC) hypothesizes soft tissue injury from excessive intervertebral motion.
Purpose of the Study:
- Determine the IV-NIC injury threshold for frontal impacts at each cervical intervertebral level.
- Compare the IV-NIC and NIC in predicting cervical spine injuries.
Main Methods:
- Simulated frontal impacts (4-10 g) on a whole human cervical spine model with muscle force replication.
- Assessed soft tissue injury by measuring changes in neutral zone or range of motion post-impact.
Main Results:
- Soft tissue injury occurred in flexion mode with an 8 g threshold.
- Average IV-NIC thresholds were 2.0 at C4-C5 and 2.3 at C6-C7.
- NIC thresholds were reached significantly earlier, indicating potential inability to predict facet/soft tissue injury.
Conclusions:
- IV-NIC effectively identifies soft tissue neck injuries.
- IV-NIC pinpoints injury level, mode, time, and severity.
- IV-NIC offers a more specific assessment of cervical spine soft tissue trauma.