Mechanical analysis of a PEEK titanium alloy macro-composite hip stem by finite element method

In this paper, numerical modeling and analysis of a HA-coated PEEK/Ti macro-composite hip stem is presented. The macro-composite hip stem consists of a titanium core in the center and a PEEK layer around it and a thin HA coating on the surface. The composite stem was designed and implanted in a stan...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2024-06, Vol.46 (6), Article 338
Main Authors: Guner, Ali Tekin, Kocak, Sait, Meran, Cemal
Format: Article
Language:English
Subjects:
Bones
Engineering
Fatigue strength
Femur
Finite element method
Hip
Hydroxyapatite
Load distribution (forces)
Mechanical analysis
Mechanical Engineering
Numerical models
Protective coatings
Residual stress
Software
Stress shielding
Surgical implants
Technical Paper
Thickness
Titanium alloys
Titanium base alloys
Transplants & implants
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Summary:In this paper, numerical modeling and analysis of a HA-coated PEEK/Ti macro-composite hip stem is presented. The macro-composite hip stem consists of a titanium core in the center and a PEEK layer around it and a thin HA coating on the surface. The composite stem was designed and implanted in a standardized human femur bone model in SolidWorks software. The intact and postoperative femur bones were loaded like as in the single-leg stance of the walking gait and the effect of PEEK layer thickness on the internal stresses was analyzed in ANSYS software. Results were compared with an all-metallic stem model. Also, the fatigue strength of the stem and stresses occurring in the implant/coating interface were analyzed. With the composite stem, more homogeneous load distribution could be achieved, thus the stress-shielding effect was considerably reduced. Composite implants with 2 and 3 mm of PEEK layer provided sufficient fatigue strength in accordance with ASTM F2996-13 and ISO 7206-4:2010 standards. Maximum stresses at the coating/implant interface were well below the plasma-sprayed HA coatings strengths on PEEK implants. It is thought that the designed composite model may be an alternative to the standard HA-coated Ti alloy hip implants.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-024-04939-2