Finite Element Analysis Of Three Commonly Used External Fixation Devices For Treating Type III Pilon Fractures.

ABIDIN, TUNKU KAMARUL ZAMAN BIN TUNKU ZAINOL (2014) Finite Element Analysis Of Three Commonly Used External Fixation Devices For Treating Type III Pilon Fractures. Medical Engineering & Physics.

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Abstract

Pilon fractures are commonly caused by high energy trauma and can result in long-term immobilizationof patients. The use of an external fixator i.e. the (1) Delta, (2) Mitkovic or (3) Unilateral frame for treatingtype III pilon fractures is generally recommended by many experts owing to the stability provided bythese constructs. This allows this type of fracture to heal quickly whilst permitting early mobilization.However, the stability of one fixator over the other has not been previously demonstrated. This study wasconducted to determine the biomechanical stability of these external fixators in type III pilon fracturesusing finite element modelling. Three-dimensional models of the tibia, fibula, talus, calcaneus, navicu-lar, cuboid, three cuneiforms and five metatarsal bones were reconstructed from previously obtainedCT datasets. Bones were assigned with isotropic material properties, while the cartilage was assigned ashyperelastic springs with Mooney–Rivlin properties. Axial loads of 350 N and 70 N were applied at thetibia to simulate the stance and the swing phase of a gait cycle. To prevent rigid body motion, the calca-neus and metatarsals were fixed distally in all degrees of freedom. The results indicate that the modelwith the Delta frame produced the lowest relative micromovement (0.03 mm) compared to the Mitkovic(0.05 mm) and Unilateral (0.42 mm) fixators during the stance phase. The highest stress concentrationswere found at the pin of the Unilateral external fixator (509.2 MPa) compared to the Mitkovic (286.0 MPa)and the Delta (266.7 MPa) frames. In conclusion, the Delta external fixator was found to be the most stableexternal fixator for treating type III pilon fractures.

Item Type: Article
Uncontrolled Keywords: Finite Element Analysis Of Three Commonly Used External Fixation Devices For Treating Type III Pilo
Subjects: R Medicine
Depositing User: MR. ADNAN YAHYA
Date Deposited: 11 Aug 2014
Last Modified: 11 Aug 2014
URI: http://repository.um.edu.my/id/eprint/92105

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