Reduction in wire tension caused by dynamic loading. An experimental Ilizarov frame study

Russa, Valentina La; Skallerud, Bjørn; Klaksvik, Jomar; Foss, Olav A.

doi:10.1016/j.jbiomech.2011.03.018

Cited by 12 publications

(9 citation statements)

References 36 publications

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“…The equation has so far been used in two more studies regarding loss of pretension due to clamping (La Russa et al, 2010b) and dynamic loading (La Russa et al, 2010a). However it is limited only to experimental studies addressing wire tension and it cannot be directly used as a tool in a clinical condition, where a wire would always be coupled to human bone and tissues.…”

Section: Discussionmentioning

confidence: 99%

“…Wire fixator B was chosen because its design was supposed to positively maintain higher wire tension (La Russa et al, 2010aRussa et al, , 2010b.…”

Section: Wire Fixators and Wiresmentioning

confidence: 99%

“…The motivation for this study was to describe and validate a method to be used in experimental studies where wire tension loss during bolt tightening, tensioner removal, cyclic transverse loading and different bolt designs could be measured. This method could then be used to improve the Ilizarov frame configuration (La Russa et al, 2010aRussa et al, , 2010b.…”

Section: Introductionmentioning

confidence: 99%

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Wire tension versus wire frequency: An experimental Ilizarov frame study

Russa

Skallerud

Klaksvik

et al. 2010

Journal of Biomechanics

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Section: Discussionmentioning

confidence: 99%

“…Wire fixator B was chosen because its design was supposed to positively maintain higher wire tension (La Russa et al, 2010aRussa et al, , 2010b.…”

Section: Wire Fixators and Wiresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wire tension versus wire frequency: An experimental Ilizarov frame study

Russa

Skallerud

Klaksvik

et al. 2010

Journal of Biomechanics

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“…If this wire deflection can be measured reliably, this variable may therefore offer a surrogate marker of bony consolidation. Whilst wire deflection has been measured using computational methods such as edge detection [ 20 ], there is, to our knowledge, no described method of wire deflection measurement that is clinically appropriate. The aim of this study was to assess the repeatability of our method for assessing wire deflection in a laboratory setting and to determine if this method could differentiate between an unstable and an intact bone reliably.…”

Section: Rationalementioning

confidence: 99%

Measurement of wire deflection on loading may indicate union in Ilizarov constructs, an in vitro model

Lineham

Stewart

Harwood

2018

Strategies in Trauma and Limb Reconstruction

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No entirely reliable method exists for assessing union during Ilizarov treatment. Premature removal results in potential treatment failure; hence, alternative methods warrant investigation. Wire deflection might provide an indication of fracture site deformation on weight bearing, indicating progress towards union. This study aimed to test a method for assessing wire deflection within an Ilizarov frame. (1) To assess the repeatability of our novel measurement method in measuring wire deflection within an Ilizarov frame in vitro. (2) To compare the amount of wire deflection in an unstable model with that in an intact bone model. (3) To assess accuracy of this method by comparing wire deflection measured with overall machine extension. Tests were performed on clinical grade-tensioned fine wire 4-ring Ilizarov constructs stabilising a simulated fracture, with and without an unstable defect. Models were sequentially loaded to 700 N using an Instron testing machine. A digital depth gauge attached to the superior ring measured relative wire displacement at the ring closest to the fracture. Tests were repeated 3 times. (1) Both unstable and stable bone models produced highly repeatable load deformation curves (R2 = 0.98 and 0.99). (2) In the unstable model, wires tensioned at 882 and 1274 N produced mean maximum deflections of 2.41 and 2.69 mm compared with 0.05 and 0.04 mm in the intact bone model (significant p < 0.0001). (3) Wire deflection and machine extension results were strongly correlated (r = 0.99). A measurable difference in wire deflection between stable and unstable situations exists using this method which appears accurate and repeatable, with clear correlation between displacement and load and displacement and machine extension. This approach might be clinically applicable, and further clinical testing is required.

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“…Das regelmäßige, mindestens 2-wöchentliche Nachspannen der Schlitzschrauben ist daher wesentlich [4], denn das Rutschen der Drähte wird neben plastischer Deformierung als Hauptgrund für Drahtlockerungen angesehen [21]. Letzter können durch die Verwendung modifizierter Schlitz-und kanülierter Schrauben deutlich verringert und damit die Draht-und Fixateursteifigkeit signifikant gesteigert werden [14,20].…”

Section: Strebenunclassified