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GTR 7 Informal Working Group June 10, 2011 Washington DC

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. Rear Impact Research Objectives.

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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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