Novel external fixation fracture method with circular locking mechanism compared with the application of dynamic axial external fixator on experimental tibial model ensures better stability in bending and favourable performance in dynamic loads

Pavić, Andrej; Kodvanj, Janoš; Sabalić, Srećko; Čukelj, Fabijan; Bakota, Bore

doi:10.1016/s0020-1383(13)70199-2

Cited by 8 publications

(9 citation statements)

References 8 publications

(11 reference statements)

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“…The fracture gap was 5 mm. Polyacetal bars have been used by many researchers to simulate a fractured bone model, 29,30 so it was rational to use them while investigating the mechanical properties of a fixator-bone system.…”

Section: Fixator-bone System Modelmentioning

confidence: 99%

Investigation of load transfer process between external fixator and bone model by experimental and finite element methods

Zhao

Chen

et al. 2019

Journal of Applied Biomaterials & Functional Materials

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Introduction: Unilateral external fixators are widely used in orthopedics to stabilize fractured bones and to treat limb deformities. One of the main problems is that it is difficult to detect healing status. In addition, whether load transfer progress between the fixator and bone model are the same under axial, torsional, and bending loads has not been studied. Methods: Therefore the main purpose of this study was to detect the load transfer process between the fixator and a bone model by measuring strains on the fixator-bone system during four healing states using experimental and finite element methods. In the experimental method, 20 strain gauges were used to measure strain on the fixator and bone model under three load conditions. Polyacetal slice models with different material properties were used to simulate the callus model during four growth states. Results:The results indicate that strain on the bone model increased and strain on the fixator parts decreased with maturation of the callus under axial, bending, and torsional loads. Although all curves showed a similar changing trend, they were slightly different under the three loads. Discussion and conclusions:This study provides a useful method to monitor the fracture healing process, and identifies the healing endpoint, detects healing status, and provides useful information for the orthopedist.

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Section: Fixator-bone System Modelmentioning

confidence: 99%

Investigation of load transfer process between external fixator and bone model by experimental and finite element methods

Zhao

Chen

et al. 2019

Journal of Applied Biomaterials & Functional Materials

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“…Pavic et al. [60] conducted mechanical bending tests to compare the performance of a novel EF against a standard dynamic fixator, that can be used to treat tibial fractures. This novel EF was a modified version of the unilateral EF with a circulatory locking mechanism to enhance the flexibility of the fixator as well as to reduce the need for pin repositioning.…”

Section: Commonly Used Ef Structural Systemsmentioning

confidence: 99%

“…Radke et al. [101] stated that in order to increase the mechanical stiffness of connecting rods without a significant increase in the weight, materials such as titanium, aluminium and carbon fibre are preferred over the widely used stainless steel rod, which is in fact a view shared by others [60] . As discussed below, several studies have compared the performance of EFs, where the connecting rods have been designed using the aforementioned materials.…”

Section: Commonly Used Materials In Ef Structural Systemsmentioning

confidence: 99%

An engineering review of external fixators

Fernando

Abeygunawardane

Wijesinghe

et al. 2021

Medical Engineering & Physics

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Highlights Mechanical stability plays a key role in the effectiveness of external fixators. Strength and stiffness are the main factors which contributes towards stability. Modified configurations of linear, circular and hybrid fixators are investigated. Light weight composite materials are gradually replacing traditional metallic alloys. Existing research gaps in further optimizing external fixators are identified.

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“…The minimum distance formula corresponding to each case can be expressed as Equation (12). where, δ a1 and δ a2 denote the angles between vectors p 2 p 1 and A i p 1 and vectors p 2 B i and A i B i , respectively.…”

Section: The Generatrix Of the Truncated Conementioning

confidence: 99%

“…[9][10][11] However, it has such disadvantages that weaker lateral rigidity and poor ability to withstand lateral shearing forces. 12,13 The Ilizarov frame, widely used in various disorders of the long bone, has strong lateral rigidity and can provide high stability, 14 but it requires clinicians to have a long learning curve due to a large number of parts and the complex configuration assembly. [15][16][17] Examples of well-known hexapod-type external fixator are the Taylor Spatial Frame (TSF), 18,19 Ortho-SUV Frame (OSF), 20,21 PoliHex, 22 TL-Hex, 23 etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of parameter deviation on the closeness of the tibial limb and external fixator based on a novel collision detection algorithm

Zuo

et al. 2021

Numer Methods Biomed Eng

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The Ortho‐SUV frame (OSF) is a hexapod external fixator widely applied in orthopedics deformity correction. The possibility of collision between OSF's struts and the soft tissue is an essential but overlooked issue. To avoid the issue, a novel collision detection algorithm is established based on a cone‐cylinder model of the tibial limb‐strut interaction for detecting the closeness of the tibial limb and external fixator. The algorithm is constructed using the vector analysis based on the model of the minimum distance between the truncated cone generatrix and the cylinder axis. The motion simulation is performed on the overall alignment through the Solidworks‐motion module to verify the feasibility of the algorithm. Subsequently, the installation parameter deviations of the bone‐fixator system are described to investigate the influence of orientation and position deviation on the closeness of the tibial limb and external fixator through the numerical method. The investigation results show that the orientation deviation γ (around the z‐axis), the position deviation τ1 and τ2 (along the x and y‐axes, respectively) have greater sensitivity to closeness and the influence of multiple deviations on the closeness has the property of superposition. The proposed algorithm can assist clinicians to strictly design and appraise frame configurations prior to their application to avoid the collision between the external fixator and the limbs during the correction. It has great application significance in the development of computer‐aided correction software.

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Novel external fixation fracture method with circular locking mechanism compared with the application of dynamic axial external fixator on experimental tibial model ensures better stability in bending and favourable performance in dynamic loads

Abstract: The novel fixator is expectedly faster applicable and offers greater extent of external fixation flexibility. Further developments of this model thus seems justified in both construction improvement and on clinical application.

Cited by 8 publications

References 8 publications

Investigation of load transfer process between external fixator and bone model by experimental and finite element methods

Investigation of load transfer process between external fixator and bone model by experimental and finite element methods

An engineering review of external fixators

Influence of parameter deviation on the closeness of the tibial limb and external fixator based on a novel collision detection algorithm

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