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Alternative bearing materials for intervertebral disc arthroplasty

Paper ID Volume ID Publish Year Pages File Format Full-Text
8513 595 2010 9 PDF Available
Title
Alternative bearing materials for intervertebral disc arthroplasty
Abstract

The objective of our study was to test alternative polymer-on-polymer articulations for cervical total disc arthroplasty with favourable biotribological properties and the benefit of radiolucency in comparison to the clinically well established metal-on-polyethylene coupling. In vitro wear simulation was performed according to ISO 18192-1:2008 (E) with the clinically introduced activ® C cervical artificial disc (Aesculap AG Tuttlingen, Germany) made of UHMWPE/CoCr29Mo6 in a direct comparison to experimental disc articulations made of PEEK, CFR–PEEK and PEK. Each material combination was tested for 10 million cycles with a customised 6 station spinal wear simulator (EndoLab Thansau, Germany). Gravimetric and geometric wear assessment, optical surface characterisation and an estimation of particle size and morphology were performed.The gravimetric wear rate of the clinical reference polyethylene-on-cobalt–chromium was 1.0 ± 0.1 mg/million cycles, compared to 1.4 ± 0.4 mg/million cycles for PEEK, to 0.02 ± 0.02 mg/million cycles for CFR–PEEK and 0.8 ± 0.1 mg/million cycles for PEK.In conclusion, a number of different candidate materials for total cervical disc arthroplasty were compared using the same disc design. Whereas the polymer-on-polymer articulation of PEK showed no substantial benefit in comparison to polyethylene-on-cobalt–chromium and whereas natural PEEK tends towards pitting and delamination, the carbon fibre reinforced PEEK demonstrated an excellent wear behaviour with a reduction in order of a magnitude. Therefore, the CFR–PEEK based polymer-on-polymer articulations may be an alternative to polyethylene-on-metal and have a high potential for next generation disc replacements.

Keywords
Cervical total disc arthroplasty; Wear simulation; Polymer-on-polymer articulation; Particle release; Polyaryletherketones
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 3, January 2010, Pages 523–531
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us