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GTR 7 Informal Working Group June 10, 2011 Washington DC

Detailed analysis plan for evaluating biofidelity of available dummies, investigating injury mechanisms, and identifying injurious kinematics in rear impact collisions. Includes documentation of injuries and correlation between physical injuries and injury criteria. This plan aims to develop injury risk curves for Post-Mortem Human Subjects (PMHS) using appropriate Injury Assessment Reference Values (IARV) for improved safety testing.

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GTR 7 Informal Working Group June 10, 2011 Washington DC

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  1. GTR 7 Informal Working Group June 10, 2011 Washington DC GTR7-07-06 Injury Criteria Analysis Plan ____________________________ • Kevin Moorhouse, Ph.D. • NHTSA • Yun-Seok Kang • Ohio State University

  2. Rear Impact Research Objectives • Evaluate biofidelity of available RIDs (BioRID, RID3D, HyIII) • Choose biofidelity test condition • Develop experimental seat for rear impact sled testing • Conduct sled tests • PMHS (Post-Mortem Human Subjects) • Dummies (BioRID II, RID3D, Hybrid III) • Assess biofidelity and repeatability of dummies • Investigate the mechanism of injury • Develop and validate 3-D cervical spine kinematic instrumentation • Identify injurious kinematics • Choose appropriate injury criterion • Assess efficacy of various ICs

  3. Rear Impact Injury Mechanism

  4. Head CG C2 C4 C6 T1 Cervical Kinematics (Generic Geometry) Including seat/sled translation T1 Fixed

  5. Documentation of Injuries

  6. Injury Examples (Post-test CT) C3/C4 C4/C5 C7/T1 C7/T1 <Disc rupture w fracture> <Facet joint> <CT sagittal view>

  7. Documentation of Injuries : disc rupture <lateral view> : subluxation : laceration (tear) <posterior view> PMHS03 PMHS04 PMHS05 PMHS06 PMHS07 PMHS08 C1 facet joint capsule C2 C2 <posterior view> C3 interspinous ligament C3 C4 anterior longitudinal ligament C4 C5 C5 ligamentum flavum C6 C6 C7 C7 T1 T1

  8. Documentation of Injuries

  9. IV-NIC Calculation

  10. IV-NIC Calculation

  11. IV-NIC Results

  12. IV-NIC Results

  13. Qualitative Correlation - IV-NIC and Injuries

  14. Qualitative Correlation - IV-NIC and Injuries

  15. Injury Criteria Analysis Plan

  16. Injury Analysis Plan • Analogous process for displacement Correlation? Yes Possibly linear combination of translational and rotational IV-NIC

  17. Cervical Kinematics (detailed geometry) • Detailed cervical model PMHS01 PMHS05 PMHS04 PMHS08 PMHS07 Sagittal View from CT

  18. Cervical Kinematics (detailed geometry) • Detailed cervical model • able to calculate strain and strain rate between vertebrae PMHS07 correlation between strain/strain rate and injuries at each level

  19. Cervical Kinematics (detailed geometry) • Detailed cervical model • able to calculate strain and strain rate between vertebrae PMHS07 correlation between strain/strain rate and injuries at each level

  20. Injury Analysis Plan • Correlation between injury / IV-NIC and existing injury criteria NDC, Nij Head-to-T1 Rotation Upper/Lower Fx, Fz, My T1G Rebound V Any physical parameters Correlation? Yes Select correlated variables for injury risk curves (IARV) for PMHS

  21. Injury Analysis Plan PMHS and BioRID II in identical test conditions <PMHS> <BioRIDII> Scaling technique for IARV(s) Transfer function for IARV(s) <Intervertebral rotation @ C4/C5>

  22. Injury Criteria Analysis Plan • Analysis completed to date • Incorporated subject-specific vertebral geometry • Documented all injuries/damage • Calculated corresponding IV-NIC values • Demonstrated qualitative correlation between injuries and IV-NIC

  23. Injury Criteria Analysis Plan • Analysis plan for next meeting • Calculate IV-NICshearand IV-NICaxial • Calculate intervertebral strain and strain rate • Quantitative correlation • Physical injuries  IV-NIC criteria   strain /strain rate • All of the above   Rear impact injury criteria • Develop injury risk curves for PMHS using appropriate IARV • PMHS IARV / risk curves  BioRID II IARV / risk curves

  24. Thanks for your attention Questions?

  25. PMHS Test Matrix 7 PMHS at each speed

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