Abstract

Spinal implants or instrumentation are commonly used for the re-alignment and treatment of spinal injuries. Pedicle screws are the type of bone screw designed for implementation into vertebral pedicle during the treatment of the disorders. Numerous variations in design of the pedicle screw have been developed to increase its load carrying capacity and thus resist the forces acting on the vertebral column. The main purpose of this study is to investigate the strengths of the commonly used pedicle screws i.e. mono axial and poly axial pedicle screws under bending conditions. For this purpose, static compression bending and static tension bending tests were carried out according to the ASTM standards and the behaviour of the pedicle screw implant was investigated. Furthermore, FE model was developed as identical as the experimentation setup and numerical simulation was carried out to study the fracture behaviour of the pedicle subassembly under static compression and tensile bending. This combined biomechanical and numerical analysis opens up the ways to improve the strength and load carrying capacity of the pedicle screw.

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