IMPACT BIOMECHANICS OF KNEE INJURIES: DEVELOPMENT OF MEASURING DEVICE

Studies of the mechanisms of injury to pedestrians hit by cars have indicated, that a reduction of the severity of the injuries to the lower extremity could probably be achieved by lowering the point of the first impact. An attempt has been made to investigate the influence on different injury related parameters by lowering the level of first contact and increasing the compliance of the car front structures. A new type of crash impact dummy - a rotationally symmetrical pedestrian dummy (RSPD), suitable for the assessment of car front aggressiveness in pedestrian impacts has been developed. In order to reduce as many as possible of the identifiable sources of scatter in recorded injury criteria it was considered advantageous to make the dummy rotationally symmetrical about the longitudinal axis of the body. In order to achieve this goal completely, the dummy has only one leg, which has the characteristics of a human leg when impacted on its lateral aspect. This limitation did not seem to be a great disadvantage since the dummy would then always represent the worst case impact model. The influence on different injury related parameters has been studied by partly the mechanical (RSPD) and partly a mathematical (MADYMO) model of the pedestrian with particular emphasis to the lower extremity. The results show that a lowering of the level of load transfer to the RSPD leg would have more influence on the bending moment and a change of the compliance of bumper structures more influence on the shear force. This confirms the previous clinical and experimental observations, that there is a correlation between both the level and the compliance of the bumper and the seriousness of the injuries to the knee. A large number of tests were sustained with the RSPD. The results from these tests confirm, that the technical solution chosen for the dummy construction has good durability and repeatability for all measured parameters.

  • Corporate Authors:

    Chalmers University of Technology, Sweden

    Institute of Transportation, Fack
    S-402 20 Goeteborg 5,   Sweden 
  • Authors:
    • KAJZER, J
  • Publication Date: 0

Language

  • English

Media Info

  • Pagination: 20 p.
  • Serial:
    • Issue Number: 1989

Subject/Index Terms

Filing Info

  • Accession Number: 00607029
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: :006
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM