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Excellent wear resistance is an important feature of orthopedic implants. However, although pure polyetheretherketone (PEEK) is outperformed by carbon fiber-reinforced PEEK (CF-PEEK) for stability and durability under laboratory conditions, it is not clear whether CF-PEEK should be preferred in all real-world applications. Results indicate that, under dipalmitoylphosphatidylcholine (DPPC) lubrication, the wear rates of PEEK are 35%–80% lower than the wear rates of CF-PEEK for different implant materials, speeds, loadings, and DPPC concentrations. Molecular dynamics calculations confirm that DPPC self-assembles on the PEEK surface to form an easily adsorbed continuous phospholipid lubricating film. In contrast, the carbon fibers on the CF-PEEK surface hinder the formation of the protective DPPC film and the CF-PEEK surface is thus subject to faster wear.


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Carbon fiber cannot always reduce the wear of PEEK for orthopedic implants under DPPC lubrication

Show Author's information Shuai YAN( )Shichao MENHongbo ZOUHaoji WANGZhongjiang ZHANGChunshen WANGTianyi SUIBin LIN( )
Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China

Abstract

Excellent wear resistance is an important feature of orthopedic implants. However, although pure polyetheretherketone (PEEK) is outperformed by carbon fiber-reinforced PEEK (CF-PEEK) for stability and durability under laboratory conditions, it is not clear whether CF-PEEK should be preferred in all real-world applications. Results indicate that, under dipalmitoylphosphatidylcholine (DPPC) lubrication, the wear rates of PEEK are 35%–80% lower than the wear rates of CF-PEEK for different implant materials, speeds, loadings, and DPPC concentrations. Molecular dynamics calculations confirm that DPPC self-assembles on the PEEK surface to form an easily adsorbed continuous phospholipid lubricating film. In contrast, the carbon fibers on the CF-PEEK surface hinder the formation of the protective DPPC film and the CF-PEEK surface is thus subject to faster wear.

Keywords: self-assembly, polyetheretherketone (PEEK), carbon fiber-reinforced PEEK (CF-PEEK), dipalmitoylphosphatidylcholine (DPPC), orthopedic implants

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Publication history

Received: 21 October 2021
Revised: 28 November 2021
Accepted: 29 January 2022
Published: 03 June 2022
Issue date: March 2023

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© The author(s) 2022.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52175180, 51805366) and the Natural Science Foundation of Tianjin City (Grant No. 19JCQNJC04100).

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