Source of the slippage in the universal joints of the Hoffmann external fixator

Drijber, F. L. I. P.; Finlay, J. B.; Moroz, T. K.; Rorabeck, Cecil H.

doi:10.1007/bf02441671

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…In order to improve necessary tests and make improvements, researchers seek to develop theoretical background of the fixation thematic based on the principles of structural mechanics [2,3]. Stiffness of the fixation device is defined according to specific type of load: axial load due to pressure force, bending and torsion [4,5]. Additionally, for the purposes of defining properties of these devices, researchers rely on force transducers [6,7].…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Performance Analysis of the Monolateral External Fixation Devices with Steel and Composite Material Frames under the Impact of Axial Load

et al. 2022

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This paper describes comparative analysis of the biomechanical performances conducted on the external fixation devices whose frames are made out of two different material (stainless steel and composite material). Biomechanical properties were determined with experimental and FEM (finite element method) models which are used to study the movement of the fracture crack, establish stiffness of the design solutions and monitor generated stresses on the zones of interest. Geometric modeling of two fixation devices configurations B50 and C50 is used as a basis for structural analysis under the impact of axial load. Structural analysis results are confirmed with an experimental setup. Analyzed deflection values in the load and fracture zones are used to define the exact values of the stiffness for the construction design and fracture, respectively. The carbon frame device configuration has 28% lower construction stiffness than the one with the steel frame (for B50 configuration), i.e., 9% (for C50 configuration). In addition, fracture stiffness values for the composite frame application are approximately 23% lower (B50 configuration), i.e., 13% lower (C50 configuration), compared to steel frame. The carbon frame device has about 33% lower stresses at the critical zones compared to the steel frame at the control zone MM+ and, similarly, 35% lower stresses at the control zone MM-. With an exhausting analysis of the biomechanical properties of the fixation devices, it can be concluded that steel frame fixation device is superior, meaning it has better biomechanical characteristics compared to carbon frame fixation device, regarding obtained data for stresses and stiffnesses of the frame construction and fracture. Considering stresses at the critical zones of the fixation device construction, the carbon frame device has better biomechanical performances compared to steel frame devices.

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Section: Introductionmentioning

confidence: 99%

Biomechanical Performance Analysis of the Monolateral External Fixation Devices with Steel and Composite Material Frames under the Impact of Axial Load

et al. 2022

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“…Stiffness of the fixation device is defined according to specific type of load: axial load due to pressure force, bending and torsion [4].…”

Section: Introductionmentioning

confidence: 99%

Stiffness Analysis of the External Fixation System at Axial Pressure Load

Pervan¹,

Mešić²,

Muminović³

et al. 2022

Adv. Sci. Technol. Res. J.

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The paper analyzes the stiffness of the Orthofix external fixation system at axial pressure load, applied to the lower leg in case of an unstable fracture. Based on the actual construction of the Orthofix fixator, its 3D model was formed, and then a structural analysis was performed in the CATIA V5 software system. The aim of this paper is to investigate the mechanical properties of Orthofix fixator. FEM analysis of the fixator revealed displacements at characteristic points of the structure and fractures. During the FEM analysis, it is possible to change the load values, all with the aim of obtaining the best possible information about the behavior of the fixator during installation and use by the patient. Based on the results obtained from the FEM analysis, it can be concluded that the Orthofix fixative shows very good stiffness, but also that it can be improved by using newer materials, such as composite or some alloys of titanium and aluminum.

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“…In order to improve necessary tests and make improvements, researchers seek to develop theoretical background of the fixation thematic based on the principles of structural mechanics [4]. Stiffness of the fixation device is defined according to specific type of load: axial load due to pressure force, bending and torsion [5]. Additionally, for the purposes of defining properties of these devices, researchers rely on force transducers [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Mechanical Stability for External Fixation Device in the Case of Anterior-Posterior Bending

Pervan¹,

Muminović²,

Mešić³

et al. 2022

Adv. Sci. Technol. Res. J.

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Analysis of mechanical stability for external fixation device Orthofix in the case of anterior-posterior bending is carried out in this paper. Device is applied to the lower leg for the case of unstable fracture. Real device is measured and 3D CAD model is developed. CAD model is used for numerical structural stress analysis which is carried out using CATIA V5 software. Results for displacements are obtained for selected critical places on the device and for the place of fracture. In addition, values of principal and von Misses stresses are obtained and analyzed. Using obtained results, conclusions about mechanical stability of device are formulated.

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Source of the slippage in the universal joints of the Hoffmann external fixator

Cited by 7 publications

References 9 publications

Biomechanical Performance Analysis of the Monolateral External Fixation Devices with Steel and Composite Material Frames under the Impact of Axial Load

Biomechanical Performance Analysis of the Monolateral External Fixation Devices with Steel and Composite Material Frames under the Impact of Axial Load

Stiffness Analysis of the External Fixation System at Axial Pressure Load

Analysis of Mechanical Stability for External Fixation Device in the Case of Anterior-Posterior Bending

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