The effect of screw insertion angle and thread type on the pullout strength of bone screws in normal and osteoporotic cancellous bone models

Patel, Parth; Shepherd, Duncan E.T.; Hukins, D.W.L.

doi:10.1016/j.medengphy.2010.05.005

Cited by 98 publications

(85 citation statements)

References 45 publications

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“…The calculated shear strength of the screw prototype in this work is 22.2 kN based on Chapman's equation [39]. This value is above the shear strength of the cortical bone suggested by Feerick and McGarry [40].…”

Section: Tensilementioning

confidence: 41%

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

et al. 2017

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Section: Tensilementioning

confidence: 41%

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

et al. 2017

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“…Other studies show that there is an ideal screw insertion angle, allowing greater pullout resistance (Kang et al, 2014;Patel et al, 2010). In loosening the screwbone interface, clinical (Vaccaro et al, 1998) and biomechanical (Panjabi et al, 1999) studies point to high tension, mainly at the lower end of the screw, and tension of the bone -screw interface increases with the angle of divergence of the screw.…”

Section: Discussionmentioning

confidence: 98%

Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method

Macedo¹,

Issa²,

Defino³

et al. 2015

Int. J. Morphol.

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SUMMARY:The objective of the present study was to validate virtual models for the study of dual core and cylindrical screws and evaluate the influence of the geometry of the screws on the mechanical behavior and anchoring. Two models of dual core screws were used, one with a double thread and the other with a single thread, both with a conventional cylindrical screw were used in this study. The stiffness was assessed in a pullout test using polyurethane. Three dimensional virtual models simulating the pullout test were created for finite element analysis. To validate the models, the results were correlated with the mechanical tests. Tensions generated in polyurethane and the screw were studied while simulating the application of force in the direction of the screw pullout, of force transmitted by the rod with the individual standing at rest, and the force transmitted by the rod when performing flexion of the trunk. The dual core screws generated lower tensions in the polyurethane when compared to the cylindrical screw for the forces studied. When evaluating internal tension in the screw, lower levels of tension were presented in the dual core -double thread, higher levels were observed in dual coresingle thread, this screw has a smaller internal diameter which may be responsible for this higher generated tension. The dual core screws double thread proportionated good anchorage with more diameter on the region with great tension, avoiding the fracture.

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“…Each holes has oval shaped which one the side has slotted. Meanwhile, the screw was modeled using ANSYS 15.0 is cortical bone screw based on Patel, et al [13]. The screw is modeled based the commercial screw in 5 types diameter.…”

Section: Methodsmentioning

confidence: 99%

Effect of Screw Diameter in Femoral Fracture Fixation Modeled by Finite Element Method

Nashrullah

Shinta

Hidayat

et al. 2017

IJPS

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Abstractresearch in the field of biomechanics related to orthopedic implants is rapidly growing in the world, especially for fixation of fractured bone. Fixation is a surgery to locate and attach a plate pressed by screws at the fractured bone. Most of the fracture bones sited in femur. This research focuses on modeling and simulation of plate and screw made of SS316L material for the fixation of the fractured femur using finite element method (FEM). SS316L is a material with good biocompatibility, cheap, and ductile enough. Modeling and simulation done using ANSYS 15.0 software. Simulation results are stress, strain, and total deformation. It is obtained that optimum diameter of screw is 4.5 mm with respect to minimum value of von Mises stress and deformation.Keywordsdeformation, finite element method, screw diameter, SS316L, von Mises stress.

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The effect of screw insertion angle and thread type on the pullout strength of bone screws in normal and osteoporotic cancellous bone models

Cited by 98 publications

References 45 publications

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

Mechanical and corrosion properties of partially degradable bone screws made of pure iron and stainless steel 316L by friction welding

Biomechanical Evaluation of a Spinal Screw Fixation System by the Finite Element Method

Effect of Screw Diameter in Femoral Fracture Fixation Modeled by Finite Element Method

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