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Pseudofracture: An Acute Peripheral Tissue Trauma Model
Published on: April 18, 2011
Compressive rib fracture: peri-mortem and post-mortem trauma patterns in a pig model.
Jules A Kieser1, Sarah Weller, Michael V Swain
1Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand. jules.kieser@otago.ac.nz
Legal Medicine (Tokyo, Japan)
|March 5, 2013
Summary
Fresh ribs exhibit pseudo-ductility and non-catastrophic responses during simulated trauma, unlike dry ribs. The periosteum plays a crucial role in this unique biomechanical behavior and rib fracture resilience.
Area of Science:
- Biomechanics
- Orthopedic Research
- Forensic Science
Background:
- Rib fractures are common, but compressive injuries are poorly understood.
- Existing research primarily focuses on high-impact rib fractures.
Purpose of the Study:
- To investigate the biomechanical and morphological differences between fresh and desiccated rib fractures.
- To understand the role of the periosteum in rib fracture mechanics.
Main Methods:
- Utilized 15 domestic pig ribs, divided into fresh (peri-mortem trauma) and desiccated (post-mortem trauma) groups.
- Applied axial compression and four-point bending tests using an Instron 3339.
- Conducted morphoscopic analysis via optical methods, micro-CT (μCT), and scanning electron microscopy (SEM).
Main Results:
- Fresh ribs demonstrated higher strength during axial compression due to fluidic components.
- Dry ribs exhibited brittle fracture, while fresh ribs showed strain softening and visco-plastic responses.
- Butterfly fractures predominated in both groups, but fresh ribs mostly sustained incomplete fractures, indicating periosteal influence.
Conclusions:
- Despite similar fracture morphology, fresh ribs display non-catastrophic responses compared to dry ribs.
- The periosteum appears to confer pseudo-ductility to fresh ribs, enabling them to sustain high strain and resist complete fracture.
- Understanding these biomechanical differences is crucial for interpreting perimortem trauma in forensic investigations.
