Development of new injury risk curves for the knee/distal femur and the hip for use in frontal impact testing.

Details

• Creators:
  Rupp, Jonathan D. ; Flannagan, Carol A. C. ; Kuppa, Shashi M.
• Corporate Creators:
  University of Michigan. Transportation Research Institute
• Corporate Contributors:
  United States. Department of Transportation. National Highway Traffic Safety Administration
• Subject/TRT Terms:
  • Crash injuries
  • Pelvis
  • Knee
  • Risk assessment
  • Injury types
  • Crushing injuries
  • Crash injuries--Risk assessment
  • Pelvis--Wounds and injuries
  • Patellofemoral joint--Wounds and injuries
• Publication/ Report Number:
  UMTRI-2009-08
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  University of Michigan. Transportation Research Institute
• Abstract:
  This report describes how new injury risk curves for the knee/distal femur and the hip were ; developed through reanalyses of existing peak knee impact force data. New hip injury risk ; curves were developed using survival analysis with a lognormal distribution. This distribution ; was parameterized to account for the effect of stature, which was the only subject characteristic ; that had a statistically significant effect on the relationship between peak force applied to the hip ; and the risk of hip fracture. The empirically defined effects of hip flexion and abduction from a ; standardized seated driving posture on mean hip fracture force were also incorporated into the ; lognormal distribution as mean shifts. Injury risk curves for the midsize male crash test dummy ; were defined by applying the stature associated with this dummy and posture of 30° flexion and ; 15° abduction from a standard reference posture and the standard reference posture (0°flexion, ; 0° adduction) to the lognormal distribution. ; A new risk curve describing the relationship between peak force applied at the knee and the ; likelihood of knee/distal femur fracture was developed by applying survival analysis to an ; existing dataset in which there was uncensored, left censored, and right censored peak knee ; impact force data. This risk curve is similar to that currently used by the NHTSA to assess the ; risk of AIS 2+ KTH injury. Because the fracture forces in the dataset used to develop the new ; knee/distal femur risk curve were primarily from tests where rigid surfaces loaded the knees of ; elderly midsize male cadavers, the new risk curve only applies to rigid knee impacts and this ; segment of the occupant population. Future work should focus on developing knee/distal femur ; risk curves that apply to other segments of the driving population by characterizing and ; accounting for the effects of subject factors and impact surface rigidity on KTH fracture forces.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17692/dot_17692_DS1.pdf
• File Type:
  [PDF - 1.14 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:89390f646658927dd3b24436deeb6de93747802176f5d73fabaed09a622e1a4f