1. A Specialized Cervical Corpectomy Plate Fault Tree Analysis 23 April 2008

2. Patient Hazards Physical Failure A Design/Labeling Failure B

3. A Screw Problems Plate Problems Screw Failure Screw Translation Screw Motion CED Screw Hole Sizing Plate Failure Plate Deformity HFG

4. B DesignLabeling Incompatible with tools Break in Packaging Melting of AdhesiveTear in Plastic Placement of plate in Ionic Circuit Poor Implantation Incorrect Sizing Inadequate labeling Ambiguous labeling Ambiguous storage Ambiguous screw-plate size combination Allowance of poor screw-plate size combination Poor Implantation

5. C Displacement of screw in torsion Subsidence displacing screw

6. D Failure of Screw-to- Bone Union Excessive screw rotation permitted Failure of static screw to lock to plate Insufficient rotational screw movement allowance

7. E Shearing of screw neck in torsion Shearing of screw neck in subsidence

8. F Too large of a diameter Too small of a diameter Plate surface interferes with static screw locking

9. G Buckling in torsion Buckling in axial loading

10. H Sub-failure stress deformation of plate