title: Investigation of Pelvic Injuries on Eighteen Post Mortem Human Subjects Submitted to Oblique Lateral Impacts.
abstract: The aim of this study was to investigate the sacroiliac joint injury mechanism. Two test configurations were selected from full scale car crashes conducted with the WorldSID 50thdummy resulting in high sacroiliac joint loads and low pubic symphysis force, i.e. severe conditions for the sacroiliac joint. The two test conditions were reproduced in laboratory using a 150-155 kg guided probe propelled respectively at 8 m/s and 7.5 m/s and with different shapes and orientations for the plate impacting the pelvis. Nine Post Mortem Human Subject (PMHS) were tested in each of the two configurations (eighteen PMHS in total). In order to get information on the time of fracture, eleven strain gauges were glued on the pelvic bone of each PMHS. Results - In the first configuration, five PMHS out of nine sustained AIS2+ pelvic injuries. All five presented sacroiliac joint injuries associated with pubic area injuries. In the second configuration, four specimens out of nine sustained AIS2+ pelvic injuries. Two of them presented sacroiliac joint fractures associated with pubic area injuries. The other two presented injuries at the pubic area and acetabulum only. The strain gauges signals suggested that the pubic fractures occurred before the sacroiliac joint fractures in the great majority of the cases (five cases out of seven). Conclusions - Even in the oblique impact conditions of the present study, the pubic symphysis area was observed to be the weakest zone of the pelvis and its failure the predominant cause of sacroiliac joint injuries. It was hypothesized that the failure of the pubic rami allowed the hemi-pelvis to rotate inward, and that this closing-book motion induced the failure of the sacroiliac joint.
authors.affiliation: CEESAR.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Lebarbé
authors.affiliation: CEESAR.
authors.forename: Pascal
authors.initials: P
authors.lastname: Baudrit
authors.affiliation: CEESAR.
authors.forename: Pascal
authors.initials: P
authors.lastname: Potier
authors.affiliation: LAB PSA Peugeot Citroën Renault.
authors.forename: Philippe
authors.initials: P
authors.lastname: Petit
authors.affiliation: LAB PSA Peugeot Citroën Renault.
authors.forename: Xavier
authors.initials: X
authors.lastname: Trosseille
authors.affiliation: Toyota Motor Europe NV/SA.
authors.forename: Sabine
authors.initials: S
authors.lastname: Compigne
authors.affiliation: Toyota Motor Corporation.
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Masuda
authors.affiliation: Toyota Motor Corporation.
authors.forename: Takumi
authors.initials: T
authors.lastname: Fujii
authors.affiliation: Université René Descartes, Paris, France.
authors.forename: Richard
authors.initials: R
authors.lastname: Douard
mesh_terms: D000063:Accidents, Traffic; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D002102:Cadaver; D005260:Female; D050723:Fractures, Bone; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D010384:Pelvic Bones / Q000293:injuries*; D012446:Sacroiliac Joint / Q000293:injuries*