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Bone Micro-Fracture Observations From Direct Impact of Slow Velocity Projectiles

Kieser, David Christopher and Riddell, Riley and Kieser, Julius August and Theis, Jean-Claude and Swain, Michael Vernon (2014) Bone Micro-Fracture Observations From Direct Impact of Slow Velocity Projectiles. Journal of Archives in Military Medicine, 2 (1). ISSN 2345-5071

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Abstract

Background: Skeletal fractures produced by bullet impacts are unique and yet their mechanism remains poorly understood. Objectives: To understand the initiation and propagation of direct ballistic skeletal fractures on cylindrical bones. Materials and Methods: We observed the effect of 9 mm spherical non-deforming steel projectiles fired at increasing velocities of 10 ft/s (3 m/s) to 200 ft/s (60 m/s) (pre-impact kinetic energy of 0.013-5.35 J) directly upon skeletally mature deer femora. Skeletal damage was assessed following micro-computed tomography and fluorescent microscopy. Results: A cascade of injury severity was identified, with fractures first seen at a pre-impact kinetic energy of 1.08 J and progressing from localized micro-fragmentation and indentation to long radiating fractures. Bone indentation was found to increase with increasing projectile speed. Conclusions: The deformation and resultant fracture process occurs as a reproducible cone crack cascade with an expanding zone of fragmentation. This knowledge should aid clinicians in understanding the formation of fracture fragments, the forces exerted on these fragments and the areas of residual weakness to ensure optimal skeletal management.

Item Type: Article
Subjects: W Health professions
Depositing User: User Mehran Mazaheri
Date Deposited: 08 Jan 2018 08:56
Last Modified: 08 Jan 2018 08:56
URI: http://eprints.ajaums.ac.ir/id/eprint/3882

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