Samo K. Fokter (Author), Nenad Gubeljak (Author), Esther Punzón Quijorna (Author), Primož Pelicon (Author), Mitja Kelemen (Author), Primož Vavpetič (Author), Jožef Predan (Author), Luka Ferlič (Author), Igor Novak (Author)

Abstract

Porous tantalum has been extensively used in orthopaedic surgery, including uncemented total knee arthroplasty (TKA). Favourable results were reported with earlier monobloc tibial components and the design evolved to modular implants. We aimed to analyse possible causes for extensive medial tibia bone loss, resulting in modular porous tantalum tibia baseplate fracture after primary TKA. Retrieved tissue samples were scanned with 3 MeV focused proton beam for Proton-Induced X-ray Emission (micro-PIXE) elemental analysis. Fractographic and microstructural analysis were performed by stereomicroscopy. A full 3D finite-element model was made for numerical analysis of stress–strain conditions of the tibial baseplate. Histological examination of tissue underneath the broken part of the tibial baseplate revealed dark-stained metal debris, which was confirmed by micro-PIXE to consist of tantalum and titanium. Fractographic analysis and tensile testing showed that the failure of the tibial baseplate fulfilled the criteria of a typical fatigue fracture. Microstructural analysis of the contact surface revealed signs of bone ingrowth in 22.5% of the surface only and was even less pronounced in the medial half of the tibial baseplate. Further studies are needed to confirm the responsibility of metal debris for an increased bone absorption leading to catastrophic tibial tray failure.

Keywords

totalna kolenska endoproteza;brez cementa;trabekularna kovina;porozni tantal;tibialna komponenta;zlom temeljne plošče brez cementa;total knee arthroplasty;uncemented;cementless;trabecular metal;porous tantalum;tibial component;cementless baseplate fracture;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: MDPI AG
UDC: 620.18:615.461
COBISS: 103785475 Link will open in a new window
ISSN: 1996-1944
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Downloads: 2
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Other data

Secondary language: Slovenian
Secondary keywords: totalna kolenska endoproteza;brez cementa;trabekularna kovina;porozni tantal;tibialna komponenta;zlom temeljne plošče brez cementa;
Type (COBISS): Article
Pages: 13 str.
Volume: ǂVol. ǂ15
Issue: ǂiss. ǂ7 (2575)
Chronology: Mar. 2022
DOI: 10.3390/ma15072575
ID: 26084218