Risk and injury severity of obese child passengers in motor vehicle crashes

Area of Science:

• Biomechanical Engineering
• Pediatric Safety
• Computational Modeling

Background:

• Obesity prevalence is increasing globally, including among children.
• Limited data exists on the specific injury risks for obese children in motor vehicle crashes (MVCs).
• Existing crash test dummies do not adequately represent obese pediatric anthropometry.

Purpose of the Study:

• To assess the risk and severity of head, neck, and chest injuries in obese children during frontal MVCs.
• To establish injury risk correlations with body mass index (BMI) in pediatric occupants.
• To utilize advanced computational modeling for simulating crash scenarios involving obese children.

Main Methods:

• Developed computational models of obese children using medical imaging and advanced modeling techniques.
• Employed a hybrid modeling approach integrating finite element and multibody models.
• Simulated various frontal crash scenarios to evaluate injury severity across different obesity levels for 3- and 6-year-old age groups.

Main Results:

• Increased body mass index (BMI) correlated with higher head injury criterion and chest acceleration.
• Forward head and torso excursions increased with rising obesity levels due to greater body mass momentum.
• No significant correlation was found between BMI and neck injury or chest deformation.

Conclusions:

• Obese children exhibit a heightened risk for head and chest injuries in frontal MVCs compared to non-obese children.
• Greater body excursion and subsequent higher accelerations contribute to increased injury risk in obese pediatric occupants.
• Computational modeling provides a viable method for investigating pediatric occupant safety in the absence of physical surrogates.