Modelling of orbital deformation using finite-element analysis

The purpose of this study was to develop a three-dimensional finite-element model (FEM) of the human orbit, containing the globe, to predict orbital deformation in subjects following a blunt injury. This study investigated the hypothesis that such deformation could be modelled using finite-element t...

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Bibliographic Details
Published in:Journal of the Royal Society interface 2006-04, Vol.3 (7), p.255-262
Main Authors: Al-Sukhun, Jehad, Lindqvist, Christian, Kontio, Risto
Format: Article
Language:English
Subjects:
Blow-Out Fracture
Computer Simulation
Eye Injuries - pathology
Female
Finite Element Analysis
Humans
Models, Anatomic
Models, Biological
Orbit
Orbit - injuries
Research Article
Rotation
Stress, Mechanical
Tomography, X-Ray Computed
Wounds, Nonpenetrating - pathology
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Summary:The purpose of this study was to develop a three-dimensional finite-element model (FEM) of the human orbit, containing the globe, to predict orbital deformation in subjects following a blunt injury. This study investigated the hypothesis that such deformation could be modelled using finite-element techniques. One patient who had CT-scan examination to the maxillofacial skeleton including the orbits, as part of her treatment, was selected for this study. A FEM of one of the orbits containing the globe was constructed, based on CT-scan images. Simulations were performed with a computer using the finite-element software NISA (EMRC, Troy, USA). The orbit was subjected to a blunt injury of a 0.5 kg missile with 30 m s−1 velocity. The FEM was then used to predict principal and shear stresses or strains at each node position. Two types of orbital deformation were predicted during different impact simulations: (i) horizontal distortion and (ii) rotational distortion. Stress values ranged from 213.4 to 363.3 MPa for the maximum principal stress, from −327.8 to −653.1 MPa for the minimum principal stress, and from 212.3 to 444.3 MPa for the maximum shear stress. This is the first finite-element study, which demonstrates different and concurrent patterns of orbital deformation in a subject following a blunt injury. Finite element modelling is a powerful and invaluable tool to study the multifaceted phenomenon of orbital deformation.
ISSN:1742-5689
1742-5662
DOI:10.1098/rsif.2005.0084