Cannulated Screws and Braided Polyester Tension Band as an Alternative for Fixation of Transverse Patella Fracture: A Finite Element Analysis Study

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Chatchanin Mayurasakorn, MD
Vajara Phiphobmongkol, MD
Weerachai Kosuwon, MD
Kriengkrai Nabudda
Suthorn Bavonratanavech, MD

Abstract

BACKGROUND: Modified tension band wiring is a common surgical technique forfixation of patella fractures; however, various complications have been associated withmetal implants in this configuration. Modification of techniques and non-metallicimplants have been proposed in order to reduce hardware associated complications whileoptimizing fixation strength. Our study investigated the biomechanical strengthprovided by various modifications of figure-of-eight tension band constructs.

MATERIALS AND METHODS: A finite element (FE) model of normal patella wasreconstructed based on CT images of a 46-year old man. Mathematical variations fromconversion of actual DICOM images into 3D geometric mesh were recorded. Simpletransverse fracture at the midpole was established with a 0.5 mm fracture gap. Twointerfragmentary fixations were made by using: 1) 2.0 mm K-Wires or 2) 4.0 mm. cannulatedcancellous screws. Figure-of-eight loop with 1.25 mm stainless-steel wire or FiberWireno.5 were allocated to each group. Figure of-eight loops in the K-wire group were invertical orientation while figure-of-eight loops in the cannulated screw group were inhorizontal orientation. These combinations constituted four different FE models. Analysiswas done on each model under the same environment, which was a 400N load on eachfragment at 45o flexion. Implant stress/strain and material deformation were determined.

RESULTS: The models with cannulated screws have von Mises stress on implant thatis three times less than those with K-wires. The least von Mises stress occurred on thecombined cannulated screws and horizontal FiberWire loop model (471.2 MPa). Thiscombination also provided least deformation to loading condition (0.1267 mm).Traditional construct with K-wires and metal wire loop was found to have maximalstress (1422.9 MPa) and maximal deformation (0.3856 mm).

CONCLUSION: Cannulated screws combined with FiberWire figure-of-eight loopoffers favorably low implant stress. Our findings demonstrate superior stability andresistance to implant failure of the construct. This low-profile tension band fixation couldbe a good alternative for transverse patella fracture.

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1.
Mayurasakorn C, Phiphobmongkol V, Kosuwon W, Nabudda K, Bavonratanavech S. Cannulated Screws and Braided Polyester Tension Band as an Alternative for Fixation of Transverse Patella Fracture: A Finite Element Analysis Study. BKK Med J [Internet]. 2017Sep.20 [cited 2020Jun.7];13(2):11. Available from: https://he02.tci-thaijo.org/index.php/bkkmedj/article/view/221900
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