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accident reconstruction newsletter
Volume Seven, Issue 2
February 2005

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Case Study: Knee Injury Analysis in Heavy Truck v. Automobile Collision
Unique PCL, ACL, and MCL rupture to rear-seat occupant
Jon Landerville, Jeff Wheeler - Vector Scientific

Introduction
A goal in forensic biomechanics is to determine if an injury mechanism is consistent with the sequence of
physical events and to determine if the injury could have been prevented. A case analysis is presented where
textbook injury mechanics did not explain the complex knee trauma sustained by a rear seat occupant in an
offset/frontal impact. However, vehicle and occupant kinematic analyses and examination of the vehicle interior
led to a specific understanding of a unique injury mechanism and prevention.

Methods
An accident reconstruction engineering analysis was performed to determine the collision dynamics. Occupant
kinematics were predicted by review of crash tests conducted at similar impact configurations and occupant
simulation software. Probable secondary contacts between the occupant and the vehicle interior were
hypothesized. An exemplar size occupant was situated in an exemplar vehicle to determine the physical
proximity and specific design characteristics of the probable secondary contact structures.

>> Read / Download Complete Case Study

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