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

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Presentation transcript:

A Specialized Cervical Corpectomy Plate Fault Tree Analysis 23 April 2008

Patient Hazards Physical Failure A Design/Labeling Failure B

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

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

C Displacement of screw in torsion Subsidence displacing screw

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

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

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

G Buckling in torsion Buckling in axial loading

H Sub-failure stress deformation of plate