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Title: Evaluation of poly-ether-ether-ketone (PEEK) for cervical disc replacement devices
Author: Xin, Hua
ISNI:       0000 0004 5350 427X
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2014
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Poly-ether-ether-ketone (PEEK) is a high performance aromatic thermoplastic with proven biocompatibility. Recently, it has been proposed as a promising bearing material for cervical total disc replacement (TDR). A new bearing combination of PEEK-on-PEEK based self-mating articulation has been used, which may overcome current bearing materials related complications. For ball-on-socket based cervical TDR designs, PEEK based bearing articulation is expected to operate under a boundary lubrication regime regardless of the radial clearance used. The contact stress encountered by the bearing surfaces is insufficient to result in either material yield or fatigue failure. High-cycle fatigue tests were performed on PEEK 450G specimens via three-point flexural bending. The obtained fatigue results (104.1 ± 5.8 MPa) show superiority over the historical polymeric bearing material UHMWPE (31 MPa). Moreover, it demonstrates a good resistance to sterilisation and thermal ageing. Laboratory wear simulation was also conducted, using spine simulators and following ISO 18192-1 standard. For PEEK-on-PEEK self-mating articulation, a steady state wear rate of 1.0 ± 0.9 mg/million cycles is obtained, which is comparable as the historical bearing combination (UHMWPE against CoCrMo). The results of this work suggest that PEEK-on-PEEK based articulation is a possible alternative for future cervical TDR designs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: RD Surgery ; TJ Mechanical engineering and machinery ; TP Chemical technology