Wear rate evaluation of a novel polycarbonate-urethane cushion form bearing for artificial hip joints

Acta Biomaterialia
Jonathan J ElsnerNoam Eliaz

Abstract

There is growing interest in the use of compliant materials as an alternative to hard bearing materials such as polyethylene, metal and ceramics in artificial joints. Cushion form bearings based on polycarbonate-urethane (PCU) mimic the natural synovial joint more closely by promoting fluid-film lubrication. In the current study, we used a physiological simulator to evaluate the wear characteristics of a compliant PCU acetabular buffer, coupled against a cobalt-chrome femoral head. The wear rate was evaluated over 8 million cycles gravimetrically, as well as by wear particle isolation using filtration and bio-ferrography (BF). The gravimetric and BF methods showed a wear rate of 9.9-12.5mg per million cycles, whereas filtration resulted in a lower wear rate of 5.8mg per million cycles. Bio-ferrography was proven to be an effective method for the determination of wear characteristics of the PCU acetabular buffer. Specifically, it was found to be more sensitive towards the detection of wear particles compared to the conventional filtration method, and less prone to environmental fluctuations than the gravimetric method. PCU demonstrated a low particle generation rate (1-5×10⁶ particles per million cycles), with the majority (96.6...Continue Reading

Citations

Jun 21, 2014·Journal of Materials Science. Materials in Medicine·Luciane Y S OliveiraCarlos J M Siqueira
Aug 26, 2014·The Spine Journal : Official Journal of the North American Spine Society·Kenneth R St John
Sep 18, 2013·Polymer Degradation and Stability·E CiprianiM Zanetti
Oct 20, 2015·Journal of the Mechanical Behavior of Biomedical Materials·Andrew T MillerKen Gall
Jun 2, 2011·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Jonathan J ElsnerNoam Eliaz
Mar 7, 2014·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Kenneth R St John
Sep 24, 2014·BioMed Research International·Sergio GabarreLuis Gracia
Mar 27, 2012·Acta Biomaterialia·R SonntagJ P Kretzer
Sep 24, 2013·Journal of the Mechanical Behavior of Biomedical Materials·Maoz ShemeshJonathan J Elsner
Feb 5, 2014·The Bone & Joint Journal·A RajpuraT N Board
Feb 3, 2016·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Leela C BiantMatthew Moran
Jan 31, 2019·Materials·Noam Eliaz
Mar 27, 2019·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Stefan LazicRichard E Field
Aug 4, 2021·The Review of Scientific Instruments·D SvetlizkyN Eliaz

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