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

Naghavi, Seyed Ataollah ORCID logoORCID: https://orcid.org/0000-0002-6111-8163, Lin, Churun, Sun, Changning, Tamaddon, Maryam, Basiouny, Mariam, Garcia-Souto, Pilar, Taylor, Stephen, Hua, Jia ORCID logoORCID: https://orcid.org/0000-0003-3558-2058, Li, Dichen, Wang, Ling and Liu, Chaozong ORCID logoORCID: https://orcid.org/0000-0002-9854-4043 (2022) Stress shielding and bone resorption of press-fit polyether-ether-ketone (PEEK) hip prosthesis: a sawbone model study. Polymers, 14 (21) , 4600. ISSN 2073-4360 [Article] (doi:10.3390/polym14214600)

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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.

Item Type: Article
Keywords (uncontrolled): PEEK, orthopaedic implants, stress shielding, finite element analysis, hip implant, biomechanical behaviors, bone resorption, hip stiffness, additive manufacturing, polyetheretherketone
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 36840
Notes on copyright: 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/).
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Depositing User: Jisc Publications Router
Date Deposited: 25 Nov 2022 10:11
Last Modified: 28 Nov 2022 17:36
URI: https://eprints.mdx.ac.uk/id/eprint/36840

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