20.500.12556/DiRROS-19048 Characterization of micro-threaded stem taper surface of cementless hip endoprostheses We investigated micro-threaded stem taper surface and its impact on premature failures, aseptic loosening, and infection in cementless hip endoprostheses. Our study focused on the fretting, and crevice corrosion of micro-threaded tapers, as well as the characterization of the microstructure and surface properties of two new and three retrieved Zweymüller stem tapers. The retrieved samples were selected and examined based on the head–stem taper interface being the sole source of modularity with a metallic component, specifically between the Ti alloy taper stem and the ceramic head. To determine the surface chemistry and microstructures of both new and retrieved hip endoprostheses stem taper titanium alloy, scanning -electron microscopy (SEM) was employed for morphological and microstructural analyses. Energy dispersive spectroscopy (EDS) was utilized for characterizing chemical element distribution, and electron backscattered diffraction (EBSD) was used for phase analysis. The roughness of the micro-threated stem tapers from different manufacturers was investigated using an optical profilometer, with standard roughness parameters Ra (average surface roughness) and Rz (mean peak to valley height of the roughness profile) being measured. Electrochemical studies revealed no fretting corrosion in retrieved stem tapers with ceramic heads. Consequently, three retrieved tapers and two new ones for comparison underwent potentiodynamic measurements in Hank’s solution to determine the corrosion rate of new and retrieved stem taper surfaces. The results showed a low corrosion rate for both new and prematurely failed retrieved samples due to aseptic loosening. However, the corrosion rate was higher in infected and low-grade infected tapers. In conclusion, our study suggests that using ceramic heads reduces taper corrosion and subsequently decreases the incidence of premature failures in total hip arthroplasty. total hip arthroplasty stem micro-threaded taper taper surface morphology microstructure corrosion Ti implant alloy true false true MDPI Švica Angleški jezik Ni določen © 2024 by the authors Neznano 2024-06-06 08:19:36 2024-06-06 08:19:36 2024-06-07 03:36:01 0000-00-00 00:00:00 2024 0 0 Nasl. z nasl. zaslona; Opis vira z dne 6. 6. 2024; str. 1-17 iss. 11 Vol. 17 Jun. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2024-06-05 620.1:669.295: 617.581 1996-1944 10.3390/ma17112751 195358467 RAZ_Dolinar_Drago_2024.pdf RAZ_Dolinar_Drago_2024.pdf 1 70C4040E28C63084981B7DDC849A236E 87ef380fa820cfa8db34743c7cda5c447c646b1651e004e0f60a89f7016c1a28 f395aed2-23cd-11ef-9c9e-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=26182 https://www.mdpi.com/1996-1944/17/11/2751 1 c0f7ca1b-23cc-11ef-9c9e-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=26181 Inštitut za kovinske materiale in tehnologije 0 0 0