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The potential and limitations of utilising head impact injury models to assess the likelihood of significant head injury in infants after a fall  C.Z.

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Presentation on theme: "The potential and limitations of utilising head impact injury models to assess the likelihood of significant head injury in infants after a fall  C.Z."— Presentation transcript:

1 The potential and limitations of utilising head impact injury models to assess the likelihood of significant head injury in infants after a fall  C.Z Cory, M.D Jones, D.S James, S Leadbeatter, L.D.M Nokes  Forensic Science International  Volume 123, Issue 2, Pages (December 2001) DOI: /S (01)

2 Fig. 1 Linear acceleration.
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3 Fig. 2 A fall involving linear acceleration.
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4 Fig. 3 A fall involving an initial jump or throw.
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5 Fig. 4 A fall involving a previous forward (horizontal) motion.
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6 Fig. 5 The relationship between kinetic energy, velocity, force and mass of an impacting body and the stopping, or deformation distance (s). Forensic Science International  , DOI: ( /S (01) )

7 Fig. 6 Impact of the skull onto deformable (soft) and rigid (hard) surfaces. Forensic Science International  , DOI: ( /S (01) )

8 Fig. 7 Angular acceleration of the head due to whiplash.
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9 Fig. 8 Axial rotational acceleration of the head.
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10 Fig. 9 The deceleration lag of the brain after the skull impacts a surface. Forensic Science International  , DOI: ( /S (01) )

11 Fig. 10 A typical g/time trace of an impact.
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12 Fig. 11 Maximum acceleration on a g/time trace.
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13 Fig. 12 Examples of acceleration time profiles from two different impact simulations. Forensic Science International  , DOI: ( /S (01) )

14 Fig. 13 The WSTC [31]. Forensic Science International  , DOI: ( /S (01) )

15 Fig. 14 Using The Wayne State University tolerance curve.
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16 Fig. 15 Typical g/time trace of a human head during impact.
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17 Fig. 16 Two different waveforms with similar GSI values
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18 Fig. 17 Head-steering wheel hub contact in medium-hard contact impact [45]. Forensic Science International  , DOI: ( /S (01) )

19 Fig. 18 Area of waveform utilised for calculating HIC [9].
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20 Fig. 19 Injury risk curve for HIC [52].
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21 Fig. 20 Percentage of animals experiencing a significant head injury as a function of HIC experienced by a 3-year-old child dummy [54]. Forensic Science International  , DOI: ( /S (01) )


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