A new multipartite plate system for anterior cervical spine surgery; finite element analysis

Abstract

Background: There are numerous available plates, almost all of which are compact one-piece plates. During the placement of relatively long plates in the treatment of multi-level cervical pathologies, instrument related complications might appear. In order to overcome this potential problem, a novel ‘articulated plate system’ is designed. We aimed to delineate finite element analysis and mechanical evaluations.

Material and methods: A new plate system consisting of multi partite structure for anterior cervical stabilization was designed. Segmental plates were designed for application onto the ventral surface of the vertebral body. Plates differed from 9 to13 mm in length. There are rods at one end and hooks at the other end. Terminal points consisted of either hooks or rods at one end but the other ends are blind. Finite element and mechanical tests of the construct were performed applying bending, axial loading, and distraction forces.

Results: Finite element and mechanical testing results yielded the cut off values for functional failure and breakage of the system.

Conclusions: The articulated system proved to be mechanically safe and it lets extension of the system on either side as needed. Ease of application needs further verification via a cadaveric study.

Keywords:

• Articulated plate
• anterior cervical fusion
• cervical spine
• finite element analysis
• mechanical test

Acknowledgements

We would like to thank Computer Engineer Yasin Talaşçı, MSci. for the technical design of the plates. Production of the plate system was performed by TasarımMed ®, Eyup, Istanbul, Turkey, as an in-kind contribution and the authors have no financial interest in or financial conflict with this company as it relates to the present report of the study.

Disclosure statement

The authors report no conflicts of interest and commercial interest now or in future should the system marketed.

The present study was conducted at the Gülhane Military Medical Academy, Haydarpaşa Teaching Hospital in Istanbul. Mechanical tests of the plate system were conducted at the laboratory of the Istanbul Technical University, Department of Metallurgy and Materials Engineering, Istanbul, Turkey.