Fracture energy threshold in parry injuries due to sharp and blunt force
| Autor: | Stephan A. Bolliger, Vera Barrera, Beat P. Kneubuehl, Simon Gentile, Akos Dobay, Michael J. Thali |
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| Přispěvatelé: | University of Zurich, Bolliger, Stephan A |
| Rok vydání: | 2019 |
| Předmět: |
Injury control
sports Polyurethanes 340 Law Poison control Wounds Penetrating 610 Medicine & health Wounds Nonpenetrating Baseball bat 01 natural sciences Pathology and Forensic Medicine 03 medical and health sciences 0302 clinical medicine Blunt sports.equipment medicine Animals 030216 legal & forensic medicine Orthodontics Sheep 010401 analytical chemistry Ulna Fracture mechanics Ulna Fractures 10218 Institute of Legal Medicine 0104 chemical sciences 2734 Pathology and Forensic Medicine Kinetics medicine.anatomical_structure Bone Substitutes Models Animal Impact energy Fracture (geology) Weapons Radius Fractures Geology |
| Zdroj: | International Journal of Legal Medicine. 133:1429-1435 |
| ISSN: | 1437-1596 0937-9827 |
| DOI: | 10.1007/s00414-019-02022-3 |
| Popis: | Blows with axes, machetes or blunt objects such as baseball bats, truncheons, etc. are often parried, resulting in typical parry injuries, or so-called nightstick fractures to the ulna. In this study, we sought to assess the impact energy required to break the ulna in such parry incidents in an experimental setting using semisynthetic and fully synthetic models. Twenty-seven sheep radii and 33 polyurethane synthetic bones were cast into gelatin prior to being fired at with missiles made of a section of an axe blade or steel rod at different firing velocities using a compressed-nitrogen cannon. Each model was then examined as to the presence of hair-line fractures or complete fractures. Sheep bones and synthetic bones displayed comparable results when struck by the axe missile; here, a clear fracture threshold was evident between 14.00 and 15.26 J. When struck by the rod missile, only the synthetic bones produced significant results, namely a fracture threshold between 20.15 and 23.59 J. In conclusion, our results show an ulnar fracture threshold of approximately 15 J when struck by an axe. The experiments regarding blows with a rod displayed a fracture threshold of around 22 J, but, as this could not be validated with biological bones, this result is questionable. |
| Databáze: | OpenAIRE |
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