14 systems for anterior cervical stabilisation were evaluate under flexion-compression bending using test procedures conforming to Static and Fatigue Test Methods for Spinal Implant Assemblies using Corpectomy Models Part 2a [ISO/TC 150/SC5 N127C]

Plates of standardised active length were tested in an in-vitro model of a single corpectomy of the lower cervical spine using composite test blocks manufactured by Sawbones to have physical properties similar to cervical vertebrae.

Results reveal a wide range in final yield strengths with bi-cortical systems significantly stronger than uni-cortical ones. There was a fourfold difference in ultimate load between the stronger and weakest systems.

We found that mode of failure was influenced by plate thickness, screw length and screw placement.