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Design attributes of spinal fusion cages and a surgical instrument to aid thier screw fixation

Jabbary-Aslani, Farnaz (2011)
Ph.D. thesis, University of Birmingham.

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Spinal fusion cages are used to aid spinal fusion where the joint between the vertebrae is fused by bone graft. The design and material of these cages are of great importance to the fusion process. Methods such as screw fixation are sometimes used to secure these cages in vivo. However, access to the cage screw holes is partially obscured by the vertebral bodies. This study aimed to evaluate the effect of side-holes on the design of a cage, assess the feasibility of a bioactive/biodegradable composite as a cage material and develop an instrument to aid screw access to the cage screw holes. Computer models of cages with between 0 and 10 side-holes were produced to model compression between adjacent vertebrae. The bioactive/biodegradable composite as a cage material was analysed using a range of Young’s modulus values for the composite. The results suggested that the number of side-holes had a negligible effect on the stress distribution within the cage and the bioactive/biodegradable composite as a cervical cage material is unlikely to fail in static compression. A cutter instrument was developed in compliance with regulatory standards. It neatly removed the targeted vertebral edge adjacent to the cage screw holes allowing screw insertion.

Type of Work:Ph.D. thesis.
Supervisor(s):Shepherd, Duncan E. T.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:2952
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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