Thoracolumbar spine kinematics and injuries in frontal impacts with reclined occupants.

Traffic Injury Prevention
Rachel RichardsonJason R Kerrigan

Abstract

Highly automated vehicles may permit alternative seating postures, which could alter occupant kinematics and challenge current restraint designs. One predicted posture is a reclined seated position. While the spine of upright occupants is subjected to flexion during frontal crashes, the orientation of reclined occupants tends to subject the spine to high compressive loads followed by high flexion loads. This study aims to investigate kinematics and mechanisms of loading in the thoracolumbar spine for a reclined seated posture through the use of postmortem human subjects (PMHS). Frontal impact sled tests (50 kph delta-v) were conducted on five adult midsize male PMHS seated with the torso reclined to 50 degrees with respect to the vertical. The PMHS were seated on a semi-rigid seat and restrained by a seat-integrated three-point belt with dual lap-belt pretensioners and a shoulder-belt pretensioner with a 3 kN load-limiter. 3-D kinematic trajectories of five chosen vertebrae, and the pelvis were measured relative to the vehicle buck. Intervertebral pressure transducers were installed at three locations in the lumbar column to detect load timing. Three PMHS suffered fractures at L1. Combined compression and flexion of the thoraco...Continue Reading

References

Mar 12, 2008·The Journal of Trauma·Sharmila DissanaikeEileen Bulger
Aug 2, 2011·Archives of Orthopaedic and Trauma Surgery·Michael A Adams, Patricia Dolan
Aug 15, 2014·Clinical Orthopaedics and Related Research·Andrea N DoudAnna N Miller
Mar 7, 2015·Accident; Analysis and Prevention·Gerald S PoplinJeff Crandall
Jul 10, 2019·Traffic Injury Prevention·Jason FormanCecilia Sunnevang
Sep 21, 2019·Traffic Injury Prevention·Katarzyna RawskaJason R Kerrigan

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