Three-Dimensional Finite Element Analysis of Several Internal and External Pelvis Fixations

[+] Author and Article Information
J. M. Garcı́a, M. Doblaré

Department of Mechanical Engineering. University of Zaragoza, Centro Politécnico Superior, Marı́a de Luna, 3, 50015-Zaragoza, Spain

B. Seral, F. Seral, D. Palanca

Department of Surgery and Traumatology, University of Zaragoza, Faculty of Medicine, Ciudad Universitaria, 50009-Zaragoza, Spain

L. Gracia

Department of Mechanical Engineering, University of Zaragoza, Centro Politécnico Superior, Marı́a de Luna, 3, 50015-Zaragoza, Spain

J Biomech Eng 122(5), 516-522 (May 31, 2000) (7 pages) doi:10.1115/1.1289995 History: Received May 25, 1999; Revised May 31, 2000
Copyright © 2000 by ASME
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FE mesh of the pelvis: (a) perspective view in solid; (b) frontal back view; (c) lateral view
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Comparison between experimental and simulation values of the pelvic response under compressive load for different injury levels (SP CUT=symphysis pubic cut, SP-SI=symphysis and sacroiliac cut, SP-SI-SS-ST=symphysis, sacroiliac, sacrospinous, and sacrotuberous cut)
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Deformed of the intact pelvis in dark and undeformed in light (magnification factor=25)
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Iliac fixation (thicker lines have been used for the external frame and thinner lines for the screws)
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Anterior fixation (thicker lines have been used for the external frame and thinner lines for the screws)
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Values of lateral displacements (mm) in the intact pelvis (left) and fractured pelvis without fixation (right)
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Distributions of lateral displacements (mm) for different external fixations in open book fractures: (a) iliac, (b) anterior, (c) combined, and (d) internal fixation with a symphysis plate
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Comparative analysis of an intact pelvis with open book fracture stability, treated with different internal and external fixations. Displacements were considered between two symmetric nodes at each side of the symphysis pubis and between two symmetric points at the center of each iliac crest.
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Frontal view of the deformed pelvis (in dark) with a unilateral fracture type C1.2, studied with the combined external fixation. Magnification factor=1. The undeformed pelvis is show in light.
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Stability of the pelvis with a unilateral fracture type C1.2. The symphysis pubis gap, the sacrum, and the iliac crest displacements were considered (PL+1SCR=internal fixation plate with the addition of one sacroiliac screw; PL+2SCR=internal fixation with the addition of two sacroiliac screws).
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Frontal and superior view of the fractured pelvis on one side of sacrum. Different color indicates fracture location.
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Perspective view of a transforaminal sacrum fracture treated with internal fixations: (a) symphysis plate with one sacroiliac screw and (b) with two screws. Magnification factor=10. Deformed pelvis—dark; undeformed pelvis—light.
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Comparative study of pelvis stability with a transforaminal fracture, treated with a symphysis plate and one or two sacroiliac screws. The symphysis pubis gap, the sacrum, and the crest iliac displacements were considered.



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