Possible Usage of Cannulated Pedicle Screws without Cement Augmentation

Demir, Teyfik

doi:10.1155/2014/984131

Cited by 6 publications

(9 citation statements)

References 20 publications

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“…The screw types (conventional, cannulated, expandable, dual lead dual cored, cancellous, cortical, etc. ), which had a significant effect on early-stage pullout performance of pedicle screws, were compared by many researchers in different biomechanical test conditions [7,14,19,38,39]. The long term pullout performances of new designs were compared with the conventional pedicle screw and early-stage pullout strengths of the same designs.…”

Section: Diameter Effect On Pulloutmentioning

confidence: 99%

Toggling effect on pullout performance of pedicle screws: Review

Aycan

Demir

2020

International Advanced Researches and Engineering Journal

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Screw loosening in spine surgery is a clinical complication in patients with poor bone quality. Pedicle screws are subjected to bending moments and axial loads that may cause toggling during daily movements of spine. The purpose of this study was to assess the previous studies related to toggling effect on pullout performance of pedicle screws by surveying the whole literature and to provide some discussion for new studies about pullout performance of pedicle screws after toggling. The search was performed by combining terms of pedicle screw, toggling, screw loosening, fatigue, cyclic loading, and pullout. The retrieved articles dealing with determined terms and also their references were reviewed. Some of these articles were eliminated after review process. Toggling was determined to be crucial for the stabilization performance of pedicle screw because the loosening mechanism of screws was affected directly by cyclic loading. The toggling or cyclic loading affected the holding capacity of pedicle screws negatively, and the possibility of loosening or failure problem for pedicle screws increased with cyclic loading magnitude. Loading conditions, screw properties, test medium, level of spinal region, and cement usage were determined by many researchers as the most important parameters affecting the toggling performance as well as the pullout strength of pedicle screws. The pullout strength of pedicle screws generally decreased with cyclic loading. The parameters of cyclic loading were fairly important for pullout performance of pedicle screws. Screw properties and cement augmentation had critical effects on the stability of screws under cyclic loading, as well.

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Section: Diameter Effect On Pulloutmentioning

confidence: 99%

Toggling effect on pullout performance of pedicle screws: Review

Aycan

Demir

2020

International Advanced Researches and Engineering Journal

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“…Although the curing time of the mixture was 20 min, tests were performed at least 24 h after the curing process. 12,30 However, vertebrae from lumbar spines of two calves (2 years old) were also used as test material. After the samples were obtained from Meat and Milk Institution as a whole spine, they were dissected and freed of all ligaments and muscular attachments.…”

Section: Test Materialsmentioning

confidence: 99%

“…The main hypothesis in this investigation is bone growth through the radial holes or slots of CPS. 12 Cement augmentation through the CPS increases the pullout strength significantly. 17 However, the higher amount of cement increases the risk of cement leakage through the spinal canal.…”

Section: Introductionmentioning

confidence: 99%

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Pullout performance comparison of novel expandable pedicle screw with expandable poly-ether-ether-ketone shells and cement-augmented pedicle screws

Aycan

Tolunay

Demir

et al. 2017

Proc Inst Mech Eng H

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Aim of this study is to assess the pullout performance of various pedicle screws in different test materials. Polyurethane foams (Grade 10 and Grade 40) produced in laboratory and bovine vertebrae were instrumented with normal, cannulated (cemented), novel expandable and normal (cemented) pedicle screws. Test samples were prepared according to the ASTM F543 standard testing protocols and surgical guidelines. To examine the screw placement and cement distribution, anteriosuperior and oblique radiographs were taken from each sample after insertion process was completed. Pullout tests were performed in an Instron 3369 testing device. Load versus displacement graphs were recorded and the ultimate pullout force was defined as the maximum load (pullout strength) sustained before failure of screw. Student's t-test was performed on each group whether the differences between pullout strength of pedicle screws were significant or not. While normal pedicle screws have the lowest pullout strength in all test materials, normal pedicle screws cemented with polymethylmethacrylate exhibit significantly higher pullout performance than others. For all test materials, there is a significant improvement in pullout strength of normal screws by augmentation. While novel expandable pedicle screws with expandable poly-ether-ether-ketone shells exhibited lower pullout performance than normal screws cemented with polymethylmethacrylate, their pullout performances in all groups were higher than the ones of normal and cannulated pedicle screws. For all test materials, although cannulated pedicle screws exhibit higher pullout strength than normal pedicle screws, there are no significant differences between the two groups. The novel expandable pedicle screws with expandable poly-ether-ether-ketone shells may be used instead of normal and cannulated pedicle screws cemented with polymethylmethacrylate due to their good performances.

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“…According to Kiyak et al expandable screws with cement augmentation had two or three times higher pullout strength than only solid cored screws for osteoporotic cases [3]. The cannulated pedicle screw can be considered as replace design of previous pedicle screw [4]. Although cannulated pedicle screw is considered as a goal standard for vertebral treatment, friction is still be re-ported happen at the screw and vertebral contact surface and also screw failure or fracture still happened due to the fatigue.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Analysis of Cannulated Pedicle Screw

Daud¹,

Nurliyana²,

Ayu³

et al. 2020

IJETT

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A cannulated pedicle screw (CPS) is a typical type of bone screw used to implant into a vertebral in the medical field. The purpose of these screws is to treat lumbar (lumbosacral) spine trauma. The screw is used to form spinal fusion transpedicle screw devices. Although the CPS is made by high strength material, the fatigue failure is still happened by time. Nevertheless the detail investigation on fatigue life cycle of screw also is lacking. This is maybe due to difficulty to investigate it by experimental (in vivo) since it is involved with human life. However, this paper focus on investigation of CPS fatigue life cycle using finite element method (FEM) since it is considered as acceptable method for biomechanics. By using the Ansys software as finite element method software, we can properly estimate the life span of the CPS. Based on the FE simulation results obtained, we found that our FE model is capable to predict fatigue life of CPS since the FE von mises stress result of our model only 7.1% difference with previous research result. Based on the prediction by FEM, the CPS life cycle is up to 3.1 years if the continuous load 11000 N is applied on the CPS by the time. Although our FE model is proven has potential in assisting CPS design, however in the future fabrication of the CPS and further testing needs to be conducted in order to evaluate this finding experimentally.

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Possible Usage of Cannulated Pedicle Screws without Cement Augmentation

Cited by 6 publications

References 20 publications

Toggling effect on pullout performance of pedicle screws: Review

Toggling effect on pullout performance of pedicle screws: Review

Pullout performance comparison of novel expandable pedicle screw with expandable poly-ether-ether-ketone shells and cement-augmented pedicle screws

Fatigue Analysis of Cannulated Pedicle Screw

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