Stress shielding and bone resorption of press-fit polyether-ether-ketone (PEEK) hip prosthesis: a sawbone model study

Article


Naghavi, S., Lin, C., Sun, C., Tamaddon, M., Basiouny, M., Garcia-Souto, P., Taylor, S., Hua, J., Li, D., Wang, L. and Liu, C. 2022. Stress shielding and bone resorption of press-fit polyether-ether-ketone (PEEK) hip prosthesis: a sawbone model study. Polymers. 14 (21). https://doi.org/10.3390/polym14214600
TypeArticle
TitleStress shielding and bone resorption of press-fit polyether-ether-ketone (PEEK) hip prosthesis: a sawbone model study
AuthorsNaghavi, S., Lin, C., Sun, C., Tamaddon, M., Basiouny, M., Garcia-Souto, P., Taylor, S., Hua, J., Li, D., Wang, L. and Liu, C.
Abstract

Stress shielding secondary to bone resorption is one of the main causes of aseptic loosening, which limits the lifespan of the hip prostheses and increases the rates of revision surgery. This study proposes a low stiffness polyether-ether-ketone (PEEK) hip prostheses, produced by fused deposition modelling to minimize the stress difference after the hip replacement. The stress shielding effect and the potential bone resorption of the PEEK implant was investigated through both experimental tests and FE simulation. A generic Ti6Al4V implant was incorporated in this study to allow fair comparison as control group. Attributed to the low stiffness, the proposed PEEK implant showed a more natural stress distribution, less stress shielding (by 104%), and loss in bone mass (by 72%) compared with the Ti6Al4V implant. The stiffness of the Ti6Al4V and the PEEK implant were measured through compression tests to be 2.76 kN/mm and 0.276 kN/mm. The factor of safety for the PEEK implant in both static and dynamic loading scenarios were obtained through simulation. Most of the regions in the PEEK implant were tested to be safe (FoS larger than 1) in terms of representing daily activities (2300 N), while the medial neck and distal restriction point of the implant attracts large von Mises stress 82 MPa and 76 MPa, respectively, and, thus, may possibly fail during intensive activities by yield and fatigue. Overall, considering the reduction in stress shielding and bone resorption in cortical bone, PEEK could be a promising material for the patient-specific femoral implants.

KeywordsPEEK; orthopaedic implants; stress shielding; finite element analysis; hip implant; biomechanical behaviors; bone resorption; hip stiffness; additive manufacturing; polyetheretherketone
PublisherMDPI
JournalPolymers
ISSN
Electronic2073-4360
Publication dates
Print29 Oct 2022
Publication process dates
Deposited25 Nov 2022
Submitted26 Sep 2022
Accepted25 Oct 2022
Output statusPublished
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Copyright Statement

Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

Digital Object Identifier (DOI)https://doi.org/10.3390/polym14214600
Web of Science identifierWOS:000881463700001
LanguageEnglish
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