Related Experiment Video
Updated: Oct 10, 2025
Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
Published on: November 8, 2024
Crash Performance of Rear-facing Restraints With a Fracture Type Spica Casted 1-Year-Old Dummy
Angela Collins1, Lucas McKean1, James Ostrander1
1Department of Orthopedic Surgery, McLaren Regional Medical Center.
Insights
Conventional car seats may offer better crash protection for children in hip spica casts than specialized seats. Further research is needed to ensure safe transport for these special cases.
Area of Science:
- Pediatric safety
- Orthopedic injury management
- Automotive safety engineering
Background:
- Motor vehicle crashes are a leading cause of injury and death in young children.
- Transporting children with hip spica casts presents unique challenges for car seat safety.
- This study evaluated car seat performance for pediatric patients in hip spica casts.
Purpose of the Study:
- To assess the safety and performance of different car seat types for children immobilized in hip spica casts.
- To compare crash test dummy loading in specialized versus conventional car seats.
- To inform caregivers and healthcare providers about safe transportation options.
Main Methods:
- A 1-year-old child-sized crash test dummy with a hip spica cast was used.
- Four rear-facing car seats were tested in simulated frontal impacts at 30 mph.
- Tests included two spica-specific seats and two conventional seats, with and without a cast.
Main Results:
- Conventional car seats resulted in lower overall loading on the dummy's head, neck, and chest.
- Spica-specific seats, while easier to use, showed higher dummy body loading.
- Chest acceleration in a spica-specific seat exceeded federal limits in a specific reclined orientation.
Conclusions:
- Conventional car seats may provide comparable or superior crash protection for children in hip spica casts.
- Spica-specific seats facilitate easier accommodation of the cast but may compromise safety.
- Hospitals should consider offering various car seat options to aid caregiver decision-making for safe child transport.
Background:
Motor vehicle crashes represent a significant cause of mortality and morbidity for young children. Safely restraining a child is typically more complicated for special cases such as children treated with a hip spica cast. In the current study, hip spica casts typical for treatment of a femoral fracture were applied to a crash dummy representing the size and weight of a 1-year-old child. This spica casted dummy was used to study the performance of 4 rear-facing car seats in a series of simulated frontal impacts.
Methods:
The restrained, rear-facing dummy was subjected to a frontal crash test at 30 mph (48 kph) per federal guidelines. Two of the tested car seats were specifically designed for transporting children with hip spica casts, while the other 2 were conventional seats capable of accommodating the cast. All seats were installed per the manufacturer's instructions. As a control, tests were performed without a cast using the conventional/standard seats.
Results:
The lowest overall loading of the dummy's head, neck, and chest occurred during tests with the standard seats. While it was easier to seat the casted child in the spica-specific seats, these designs led to greater loading on the dummy's body. In a spica-specific seat, the chest acceleration values exceeded the federal limit in a test where the seat was installed in a reclined orientation that was within the manufacturer's described positioning.
Conclusions:
Spica-specific seats more easily accommodate the cast, but conventional seats can provide similar levels of protection in a crash. As cast and seat designs continue to evolve, hospitals might consider having a range of seats available for patient use. It is important to help caregivers make informed decisions on how and when to transport children with hip spica casts.
