The stability of the plate-screw constructs as well as the stresses and strains in the implant and bone graft depend on many factors including the angular positioning of the screws with respect to the end plate attached to the vertebra. It is hypothesized that the placement of the screw parallel to the endplates provide greater stability and reduced stresses in the implant and bone graft as compared to constructs in which the screws are placed oblique with respect to the end plates.

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