The Effect of Patient-Related Factors on the Primary Fixation of PEEK and Titanium Tibial Components: A Population-Based FE Study

Author:

Post Corine E.1ORCID,Bitter Thom1,Briscoe Adam2,van Langen Inger1,Fluit René13ORCID,Verdonschot Nico14,Janssen Dennis1ORCID

Affiliation:

1. Orthopaedic Research Laboratory, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands

2. Invibio Ltd., Thornton Cleveleys FY5 4QD, Lancashire, UK

3. Faculty of Science and Engineering, University of Groningen, 9747 AG Groningen, The Netherlands

4. Laboratory for Biomechanical Engineering, Faculty of Engineering Technology, University of Twente, 7522 NB Enschede, The Netherlands

Abstract

Polyetheretherketone (PEEK) is of interest as implant material for cementless tibial total knee arthroplasty (TKA) components due to its potential advantages. One main advantage is that the stiffness of PEEK closely resembles the stiffness of bone, potentially avoiding peri-prosthetic stress-shielding. When introducing a new implant material for cementless TKA designs, it is essential to study its effect on the primary fixation. The primary fixation may be influenced by patient factors such as age, gender, and body mass index (BMI). Therefore, the research objectives of this finite element (FE) study were to investigate the effect of material (PEEK vs. titanium) and patient characteristics on the primary fixation (i.e., micromotions) of a cementless tibial tray component. A total of 296 FE models of 74 tibiae were created with either PEEK or titanium material properties, under gait and squat loading conditions. Overall, the PEEK models generated larger peak micromotions than the titanium models. Differences were seen in the micromotion distributions between the PEEK and titanium models for both the gait and squat models. The micromotions of all tibial models significantly increased with BMI, while gender and age did not influence micromotions.

Funder

Invibio Ltd.

Publisher

MDPI AG

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