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New Risk Curves for NHTSA’s Brain Injury Criterion (BrIC): Derivations and Assessments
Technical Paper
2016-22-0012
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Abstract
The National Highway Traffic Safety Administration (NHTSA) recently published a Request for Comments regarding a potential upgrade to the US New Car Assessment Program (US NCAP) - a star-rating program pertaining to vehicle crashworthiness. Therein, NHTSA (a) cited two metrics for assessing head risk: Head Injury Criterion (HIC15) and Brain Injury Criterion (BrIC), and (b) proposed to conduct risk assessment via its risk curves for those metrics, but did not prescribe a specific method for applying them. Recent studies, however, have indicated that the NHTSA risk curves for BrIC significantly overstate field-based head injury rates. Therefore, in the present three-part study, a new set of BrIC-based risk curves was derived, an overarching head risk equation involving risk curves for both BrIC and HIC15 was assessed, and some additional candidate-predictor-variable assessments were conducted.
Part 1 pertained to the derivation. Specifically, data were pooled from various sources: Navy volunteers, amateur boxers, professional football players, simple-fall subjects, and racecar drivers. In total, there were 4,501 cases, with brain injury reported in 63. Injury outcomes were approximated on the Abbreviated Injury Scale (AIS). The statistical analysis was conducted subject to ordinal logistic regression analysis (OLR), such that the various levels of brain injury were cast as a function of BrIC. The resulting risk curves, with Goodman Kruksal Gamma=0.83, were significantly different than those from NHTSA.
Part 2 pertained to the assessment relative to field data. Two perspectives were considered: “aggregate” (ΔV=0-56 km/h) and “point” (high-speed, regulatory focus). For the aggregate perspective, the new risk curves for BrIC were applied in field models pertaining to belted, mid-size, adult drivers in 11-1 o’clock, full-engagement frontal crashes in the National Automotive Sampling System (NASS, 1993-2014 calendar years). For the point perspective, BrIC data from tests were used. The assessments were conducted for minor, moderate, and serious injury levels for both Newer Vehicles (airbag-fitted) and Older Vehicles (not airbag-fitted). Curve-based injury rates and NASS-based injury rates were compared via average percent difference (AvgPctDiff). The new risk curves demonstrated significantly better fidelity than those from NHTSA. For example, for the aggregate perspective (n=12 assessments), the results were as follows: AvgPctDiff (present risk curves) = +67 versus AvgPctDiff (NHTSA risk curves) = +9378. Part 2 also contained a more comprehensive assessment. Specifically, BrIC-based risk curves were used to estimate brain-related injury probabilities, HIC15-based risk curves from NHTSA were used to estimate bone/other injury probabilities, and the maximum of the two resulting probabilities was used to represent the attendant head-injury probabilities. (Those HIC15-based risk curves yielded AvgPctDiff=+85 for that application.) Subject to the resulting 21 assessments, similar results were observed: AvgPctDiff (present risk curves) = +42 versus AvgPctDiff (NHTSA risk curves) = +5783. Therefore, based on the results from Part 2, if the existing BrIC metric is to be applied by NHTSA in vehicle assessment, we recommend that the corresponding risk curves derived in the present study be considered.
Part 3 pertained to the assessment of various other candidate brain-injury metrics. Specifically, Parts 1 and 2 were revisited for HIC15, translation acceleration (TA), rotational acceleration (RA), rotational velocity (RV), and a different rotational brain injury criterion from NHTSA (BRIC). The rank-ordered results for the 21 assessments for each metric were as follows: RA, HIC15, BRIC, TA, BrIC, and RV. Therefore, of the six studied sets of OLR-based risk curves, the set for rotational acceleration demonstrated the best performance relative to NASS.
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Authors
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Citation
Laituri, T., Henry, S., Pline, K., Li, G. et al., "New Risk Curves for NHTSA’s Brain Injury Criterion (BrIC): Derivations and Assessments," SAE Technical Paper 2016-22-0012, 2016, https://doi.org/10.4271/2016-22-0012.Data Sets - Support Documents
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| Unnamed Dataset 1 |
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References
- El-Jawahri , R. , Laituri , T. , Kim , A. , Rouhana , S. , and Weerappuli , P. 2014 Finite-element-based transfer equations: post-mortem human subjects versus Hybrid III test dummy in blunt impact Technical Paper no. SAE- 2014-01-0486 Society of Automotive Engineers Warrendale, PA
- Eppinger , R. , Marcus , J. , and Morgan , R. 1984 Development of dummy and injury index for NHTSA's thoracic side impact protection research program Technical Paper no. 840885 Society of Automotive Engineers Warrendale, PA
- Eppinger , R. , Sun , E. , Bandak , F. , Haffner , M. , Khaewpong , N. , Maltese , M. , Kuppa , S. , Nguyen , T. , Takhounts , E. , Tannous , R. , Zhang , A. , and Saul , R. 1999 Injury criteria for the assessment of advanced automotive restraint systems - II National Highway Traffic Safety Administration 1 70
- Ewing , C. , Thomas , D. , Lustick , L. , Becker , E. , Willems , G. , Muzzy , W. 1975 The effect of the initial position of the head and neck on the dynamic response of the human head and neck to - Gx impact acceleration Technical Paper no. 751157 Society of Automotive Engineers Warrendale, PA
- Gadd , C. 1962 Criteria for injury potential in impact Impact Acceleration Stress Symposium, National Academy of Sciences, National Research Council, Publication No. 977
- Hardy , W. , Foster , C. , Mason , M. , Yang , K. , King , A. , and Tashman , S. 2001 Investigation of head injury mechanisms using neutral density technology and high-speed biplanar x-ray Proceedings of the 45th Stapp Car Crash Conference 337 368 Society of Automotive Engineers Warrendale, PA
- Hertz , E. 1993 A Note on the Head Injury Criteria (HIC) as a predictor of the risk of skull fracture Proceedings of the Association for the Advancement of Automotive Medicine Barrington, IL
- Karton , C. , Hoshizaki , T. , and Gilchrist , M. 2014 The influence of impactor mass on the dynamic response of the Hybrid III headform and brain tissue deformation The Mechanism of Concussion in Sports Ashare A. Ziejewsk M. 23 40 ASTM International Pennsylvania
- Kuppa , S. 2004 Injury criteria for side impact dummies National Transportation Biomechanics Research Center, NHTSA
- Kuppa , S. 2016 Personal communication March 4 2016
- Laituri , T. , Kachnowski , B. , Prasad , P. , Sullivan , K. , and Przybylo , P. 2003a A theoretical, risk assessment procedure for in-position drivers involved in full-engagement frontal impacts Technical Paper no. 2003-01-1354 Society of Automotive Engineers Warrendale, PA
- Laituri , T. , Prasad P , Kachnowski , B. , Sullivan , K. , Przybylo P. 2003b Predictions of AIS3+ thoracic risks for belted occupants in full-engagement, real-world frontal impacts: Sensitivity to various theoretical risk curves Technical Paper no. 2003-01-1355 Society of Automotive Engineers Warrendale, PA
- Laituri , T. , Henry , S. , Kachnowski , B. , and Sullivan , K. 2009 Initial assessment of the next-generation USA frontal NCAP: Fidelity of various risk curves for estimating field injury rates of belted drivers Technical Paper no. SAE- 2009-01-0386 Society of Automotive Engineers Warrendale, PA
- Laituri , T. , El-Jawahri , R. , Henry , S. and Sullivan , K. 2015a Field-based assessments of various AIS2+ head risk curves for frontal impact Technical Paper no. SAE- 2015-01-1437 Society of Automotive Engineers Warrendale, PA
- Laituri , T. , Henry , S. , El-Jawahri , R. , Muralidharan , N. , Li , G. , and Nutt , M. 2015b Derivation of a provisional, age-dependent, AIS2+ thoracic risk curve for the THOR50 test dummy via integration of NASS cases, PMHS tests, and simulation data Stapp Car Crash Journal 57 243 266
- Laituri , T. and Henry , S. 2016 Considerations for head-injury categorization via NASS analysis SAE International Journal of Transportation Safety April 15 2016 Society of Automotive Engineers Warrendale, PA
- Lissner , H. , Lebow , M. , and Evans , F. 1960 Experimental studies on the relation between acceleration and intracranial pressure changes in man Surgery, Gynecology, Obstetrics 111 329 338
- Mertz , H. , Prasad , P. , and Nusholtz , G. 1996 Head injury risk assessment for forehead impacts Technical Paper no. 960099 Society of Automotive Engineers Warrendale, PA
- Mertz , H. , Prasad , P. , and Irwin , A. 1997 Injury risk curves for children and adults in frontal and rear collisions Proceedings of the 41st Stapp Car Crash Conference 13 30 Society of Automotive Engineers Warrendale, PA
- Mueller , B. , MacAlister , A. , Nolan , J. , and Zuby , D. 2015a Comparison of HIC and BrIC head injury risk in IIHS frontal crash tests to real-world head injuries Proceedings of 24th Enhanced Safety of Vehicles (ESV) Conference Gothenburg, Sweden
- Mueller , B. , 2015b Personal communication Sept 1 2015
- Newman , J.A. , Barr , C. , Beusenberg , M. , Fournier , E. , Shewchenko , N. , Welbourne , E. , Withnall , C. 2000 A new biomechanical assessment of mild traumatic brain injury Part 2 - Results and conclusions Proc. International Research Conference on the Biomechanics of Impact (IRCOBI) 223 233
- NHTSA 1995 Final economic assessment, FMVSS No. 201, upper interior head protection Docket No. NHTSA-1996-1762 item ID-0003 August 8 1995
- NHTSA 2000 Final economic assessment, FMVSS No. 208, advanced air bags Docket Nos. NHTSA-99-6407-143 and NHTSA-00-7013-2 May 4 2000
- NHTSA 2007 Consumer information: New Car Assessment Program Docket No. NHTSA-2006-26555 73 134 July 11 2008 40042
- NHTSA 2015 Request for comments Docket No. NHTSA-2015-0119 New Car Assessment Program Dec. 8 2015
- NHTSA NHTSA Vehicle crash test database http://www-nrd.nhtsa.dot.gov/database/veh/veh.htm 09 10 2015
- Ommaya , A. , Yarnell , P. , Hirsch , A. , and Harris , E. 1967 Scaling of experimental data on cerebral concussion in sub-human primates to concussion threshold for man Technical Paper no. 670906 Society of Automotive Engineers Warrendale, PA
- O'Riordain , K. , Thomas , P.M. , Phillips , J.P. , and Gilchrist , M.D. 2003 Reconstruction of real world head injury accidents resulting from falls using multibody dynamics Clinical Biomechanics 18 590 600
- Peng , Y. , Yang , J. , Deck , C. , Otte , D. , and Willinger , R. 2014 Development of head injury risk functions based on real-world accident reconstruction International Journal of Crashworthiness 19 2 105 114
- Pincemaille , Y. , Trosseille , X. , Mack , P. , Tarrière , C. , Breton , F. , and Renault , B. 1989 Some new data related to human tolerance obtained from volunteer boxers Technical Paper no. 892435 Society of Automotive Engineers Warrendale, PA
- Prasad , P. and Mertz , H. 1985 The position of the United States delegation to the ISO Working Group 6 on the use of HIC in the automotive environment Government/Industry Meeting and Exposition Washington, D.C. May 1985 Technical Paper no. 851246 Society of Automotive Engineers Warrendale, PA
- Prasad , P. , Dalmotas , D. , and German , A. 2014 The field relevance of NHTSA’s oblique research moving deformable barrier tests Stapp Car Crash Journal 58 175 95
- Prasad , P. , Dalmotas , D. , and German , A. 2015 The coincidence and severity of small overlap frontal crashes in NASS-CDS Proceedings of 24th Enhanced Safety of Vehicles (ESV) Conference Gothenburg, Sweden
- Rousseau , P. 2014 Analysis of concussion metrics of real-world concussive and non-injurious elbow and shoulder to head collisions in ice hockey PhD Dissertation University of Ottawa
- Rowson , S. and Duma , S. 2013 Brain Injury Prediction: Assessing the combined probability of concussion using linear and rotational head acceleration Annals of Biomedical Engineering 41 5 873 882
- Somers , J. Granderson , B. , Melvin , J. , Tabiesi , A. , Lawrence , C. , Feiveson , A. , Genhardt , M. , Ploutz-Snyder , R. , and Patalak , J. 2011 Development of head injury assessment reference values based on NASA injury modeling Stapp Car Crash Journal 55 49 74
- Somers , J. , 2016 Personal communication March 22 2016
- Sullivan , K. , Henry , S. , and Laituri , T. 2008 A frontal impact taxonomy for USA field data Technical Paper no. SAE- 2008-01-0526 Society of Automotive Engineers Warrendale, PA
- Takhounts , E. , Eppinger , R. , Campbell , J. , Tannous , R. , Power , E. , and Shook , L. 2003 On the development of the SIMon finite element head model Stapp Car Crash Journal 47 107 133
- Takhounts , E. , Hasija , V. , Ridella , S. , Rowson , S. , and Duma , S. 2011 Kinematic rotational brain injury criterion (BRIC) Proceeding of the 22nd Enhanced Safety of Vehicles (ESV) Washington, D.C
- Takhounts , E. , Craig , M. , Moorhouse , K. , McFadden , J. , and Hasija , V. 2013 Development of brain injury criteria (BrIC) Stapp Car Crash Journal 57 243 266
- Versace , J. 1971 A review of the Severity Index Proceedings of the 15th Stapp Car Crash Conference 771 796 Society of Automotive Engineers Warrendale, PA
- Viano , D. , Melvin , J. , McCleary , J. , Medeira , R. , Shee , T. , and Horsch , J. 1986 Measurement of head dynamics and facial contact forces in the Hybrid III dummy Technical Paper no. 861891 Society of Automotive Engineers Warrendale, PA
- Viano. D. , Casson , I. , and Pellman , E. 2007 Concussion in professional football: Biomechanics of the struck player - Part 14 Neurosurgery 61 313 328
- Viano , D. 2016 Personal communication March 15 2016
- Weerappuli , P. , Chiu , E. , Barbat , S. , and Prasad , P. 2002 CART impact recorder data analysis using mathematical modeling Proceedings ASME 2002 International Mechanical Engineering Congress and Exposition, Applied Mechanics and Biomedical Technology 207 233 American Society of Mechanical Engineers New York, NY
- Zou , H. 2007 Analysis and modeling of the biomechanics of brain injury under impact PhD Dissertation Ohio State University