Assessment of the pubic force as a pelvic injury criterion in side impact

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Leport, Tiphaine¹; Baudrit, Pascal¹; Trosseille, Xavier²; Petit, Philippe²; Palisson, Anna²; Vallancien, Guy³

Assessment of the pubic force as a pelvic injury criterion in side impact

Stapp Car Crash J. 2007;51:467-488

Affiliations

¹Ceesar, Nanterre, France

²LAB PSA Peugeot-Citroën, Renault, Nanterre, France

³Université René Descartes, Paris, France
Abstract and keywords

In the literature, injuries at the ischio or ilio pubic ramus level are reported to occur to approximately (3/4) of the occupants injured at the pelvis during side impact. Assuming that the load going through the pubis was a good indicator of the ramus stress, the pubic force was widely accepted as a protection criterion for pelvic fractures on side impact dummies. However, no data regarding the actual loads going through the pubis is currently available in the literature for Post Mortem Human Subjects (PMHS) in dynamic conditions.

The goal of this study was to determine pelvic biofidelity specifications in terms of load path, to evaluate the pertinence of the pubic force as a criterion, and to develop a pelvic injury risk curve as a function of the pubic force. For that purpose, a pubic load cell was developed for PMHS use, and 16 side impact tests were performed on 8 PMHS using boundary conditions similar to impactor tests and sled tests reported in the literature. One kind of impact was applied on one side of a subject and the other kind of impact was then applied on the other side of the same subject, at non injury severities. The ratio between the peak external force and the peak pubic force was calculated for each subject, and a mean ratio was then calculated for each of the test conditions. These ratios were finally used to calculate the pubic forces from the external pelvic forces for 90 PMHS side impact test data available in the literature. Injury risk curves as a function of the pubic force were developed from these data.

Two normalized pubic force corridors from the 16 tests are presented, the first one for the impactor tests, the second one for the sled-like tests. The test results show statistically different ratios between the peak external force and the peak pubic force, for the two configurations (an average ratio of 3.3 for impactor tests and 4.6 for sled-like tests). The PMHS injury risk curves based on the external pelvic force were observed to depend on the test conditions (impactor versus sled) while the injury risk curves constructed using the calculated pubic load were not. Therefore, the pubic force is considered as a more pertinent injury criterion for pure lateral impact.

Keywords: Pelvis; Pubic Force; Pelvic biofidelity specification; Injury risk curve; Side impact
Links

PubMed: 18278608

SAE: 2007-22-0019

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2016	Peres J, Auer S, Praxl N. Development and comparison of different injury risk functions predicting pelvic fractures in side impact for a Human Body Model. In: Proceedings of the 2016 International IRCOBI Conference on the Biomechanics of Injury. September 14-16, 2016; Malaga, Spain.661-678.
2022	Haverfield ZA, Hunter RL, Loftis KL, Agnew AM. Skeletal site and method-dependent variability of bone mineral density in injury biomechanics research. In: Proceedings of the 2022 International IRCOBI Conference on the Biomechanics of Injury. September 14-16, 2022; Porto, Portugal.332-360.
2008	Trosseille X, Baudrit P, Leport T, Vallancien G. Rib cage strain pattern as a function of chest loading configuration. Stapp Car Crash J. 2008;52:205-231. SAE 2008-22-0009.
2015	Petit P, Trosseille X, Lebarbé M, Baudrit P, Potier P, Compigne S, Masuda M, Yamaoka A, Yasuki T, Douard R. A comparison of sacroiliac and pubic rami fracture occurrences in oblique side impact tests on nine post mortem human subjects. Stapp Car Crash J. November 2015;59:23-52.
2009	Salzar RS, Genovese D, Bass CR, Bolton JR, Guillemot H, Damon AM, Crandall JR. Load path distribution within the pelvic structure under lateral loading. Int J Crashworthiness. 2009;14(1):99-110.
2019	Neice R. Development and Validation of a Pelvis Finite Element Model for Side Panel Intrusion Threats [Master's thesis]. Charlottesville, VA: University of Virginia; August 2019.