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Comparison of Bending Properties in Paired Human Ribs with and without Costal Cartilage
Rose Schaffer1, Yun-Seok Kang1, Angelo Marcallini1
1Injury Biomechanics Research Center, The Ohio State University.
Stapp Car Crash Journal
|December 20, 2024
Summary
Costal cartilage significantly impacts rib bending properties. Including it in human body models (HBMs) is crucial for accurate thoracic injury prediction in vehicle crashes.
Area of Science:
- Biomechanics
- Orthopedics
- Human Body Models
Background:
- Thoracic injuries, particularly rib fractures, are common in motor vehicle crashes.
- Human body models (HBMs) are increasingly used for predicting injury risk.
- Comprehensive evaluation of thoracic tissues is needed to improve HBMs.
Purpose of the Study:
- To quantify the contribution of costal cartilage to the bending properties of human ribs.
- To assess the influence of costal cartilage on rib fracture mechanics.
Main Methods:
- Fifteen bilateral pairs of human 5th ribs were used.
- One rib from each pair was tested with costal cartilage, the other without.
- Ribs underwent anterior-posterior (A-P) loading at 2 m/s until failure.
Main Results:
- Statistically significant differences in force, stiffness, and yield strain were observed between ribs with and without costal cartilage.
- Ribs with costal cartilage showed lower peak force, greater displacement, and longer time to fracture.
- Variations in calcification and geometry complicated direct comparisons.
Conclusions:
- Costal cartilage plays a significant role in human rib biomechanical properties.
- Future human body models (HBMs) should incorporate costal cartilage for improved thoracic injury prediction.
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