worldsid pelvic criteria - unece.orgworldsid_pelvic_criteria.pdf · proposed project – research...
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![Page 1: WorldSID pelvic criteria - unece.orgWorldSID_pelvic_criteria.pdf · Proposed Project – Research Questions •Can SI load enhance injury prediction over PS load? •Does this enhancement](https://reader030.vdocument.in/reader030/viewer/2022041300/5e0f92477ec559125375078e/html5/thumbnails/1.jpg)
WorldSID Pelvic Injury Criterion.
September 2012 update.
Damien Subit, Richard Kent
UNIVERSITY OF VIRGINIA
CENTER for APPLIED BIOMECHANICS
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Pelvic Fracture Prediction with WorldSID
Inferior view of the WorldSID left hemi-pelvis
Pubic symphysis
load cell (1-axis)
SI load cell
(6-axis)
WorldSID Pelvic Injury Criteria
(Petitjean et al. 2009) AIS 2+
AIS 3+
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Injury Risk Functions – Petitjean et al. (2009)
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Addition of Sacro-Iliac Load Cell
Inferior view of the WorldSID left hemi-pelvis
Pubic symphysis
load cell (1-axis)
SI load cell
(6-axis)
WorldSID Pelvic Injury Criteria
(Petitjean et al. 2009) AIS 2+
AIS 3+
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Research Questions
•What is injury distribution in the field?
•How is load distributed within pelvis during a lateral impact? Does WorldSID match the human?
•Can SI load enhance injury prediction over PS load?
•Does this enhancement depend on injury location?
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Experiments to Determine Load Distribution (Salzar et al. 2009)
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Specimen Preparation
Pelvis cut along line defined by the
mid distance of the two anterior iliac
spines and the top of the greater
sciatic notch.
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Potted and Sectioned Pelvis
Section of pelvis removed
Anterior Pelvis Posterior Pelvis
Load Cell Mounting Locations
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High-Rate Acetabulum Impact
Test 1_9
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High-Rate Iliac Wing Impact
Test 1_14
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Injury Outcomes
Qu
asis
tati
c
Dyn
am
ic
Ace
tab
-
ulu
m
Ac
eta
bu
lum
Il
iac W
ing
Il
iac
Win
g
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Injury Outcomes
Qu
asis
tati
c
Dyn
am
ic
Ace
tab
-
ulu
m
Ac
eta
bu
lum
Il
iac W
ing
7/8 anterior tests
caused sacral fx
5/8 posterior
tests caused PS
disruption or
anterior fx
Ilia
c
Win
g
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Quasi-static Load Distribution
0%
100% 46±6%
54±6%
Iliac Wing Loading Acetabulum Loading
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Dynamic Load Distribution
36±23%
64±23% 11±6%
Iliac Wing Loading Acetabulum Loading
89±6%
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Force at Fracture
-968
-1911
63
-418
-895-1022
-1634
-3107
-3500
-3000
-2500
-2000
-1500
-1000
-500
0
500
1 2 3 4
Fo
rce
(N
)
Quasi-static High Rate Quasi-static High RateAcetabulum Load Acetabulum Load Iliac Wing Load Iliac Wing Load
Anterior Pelvis
Posterior Pelvis
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-968
-1911
63
-418
-895-1022
-1634
-3107
-3500
-3000
-2500
-2000
-1500
-1000
-500
0
500
1 2 3 4
Fo
rce
(N
)
Quasi-static High Rate Quasi-static High RateAcetabulum Load Acetabulum Load Iliac Wing Load Iliac Wing Load
Anterior Pelvis
Posterior Pelvis
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Proposed Project – Research Questions
• How is load distributed within pelvis during a lateral impact? Does WorldSID match the human?
Inferior view of the WorldSID left hemi-pelvis
Pubic symphysis
load cell (1-axis)
SI load cell
(6-axis)
Acetabulum impact
Illiac wing impact
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SI vs PS loads in sled and in-vehicle impacts
• 3 datasets: – MCW sled tests (Heidelberg-type sled)
– Transport Canada (TC) (in-vehicle)
– NHTSA (FMVSS 214, pole oblique)
• Correlation between the peaks of the two pelvic forces (SI and PS)?
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SI vs PS loads in sled and in-vehicle impacts
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SI vs PS loads in sled and in-vehicle impacts
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SI vs PS loads in sled and in-vehicle impacts
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SI vs PS loads in sled and in-vehicle impacts
‘Perfect side impact’
‘Combined’
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Proposed Project – Research Questions
• Can SI load enhance injury prediction over PS load?
• Does this enhancement depend on injury location?
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Proposed Project – Research Questions
• Can SI load enhance injury prediction over PS load?
• Does this enhancement depend on injury location?
– Matched WS/PMHS impactor tests (n=?) – Range of injury outcomes – Predictor variables
• PS force, SI force, combined model
– “Posteriorly injured” cohort – “Anteriorly injured” cohort – Combined cohort
• Completion date: May 2013