Analysis of microstructural aspects of a hip stem failure made of the REX 734 stainless steel

Oksiuta, Z.; Mazurkiewicz, Z; Romanczuk, Eliza; Andrzejewicz, Marcin; Krawczyńska, Agnieszka

doi:10.1016/j.engfailanal.2016.11.012

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…Oksiuta et al investigated retrieved REX 734 cemented stems that broke and found a similar homogeneous microstructure with annealing twins. He concluded that the brittle hard phases with a size up to 0.3 μm are niobium carbides that could possibly initiate the fatigue fracture 95 . Romanczuk et al compared the corrosion resistance of the two common austenitic stainless steels 316LV and REX 734 and found superior resistance of REX 734 after potentiodynamic measurements 18 .…”

Section: Discussionmentioning

confidence: 99%

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

et al. 2022

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Fretting corrosion is associated with increased risk of premature implant failure. In this complex in vivo corrosion system, the contribution of static crevice corrosion of the joined metal alloys is still unknown. The aim of this study was to develop a methodology for testing crevice corrosion behavior that simulates the physiological conditions of modular taper junctions and to identify critical factors on corrosion susceptibility. Samples of medical grade CoCr28Mo6 cast and wrought alloy, TiAl6V4 wrought alloy and REX 734 stainless steel were prepared metallographically and the microstructure was investigated using scanning electron microscopy (SEM). Crevice formers that mimic typical geometries of taper junctions were developed. Crevice corrosion immersion tests were performed in different physiological fluids (bovine serum or phosphate buffered saline with additives of 30 mM H 2 O 2 at pH = 1) for 4 weeks at 37 C. SEM with energy dispersive X-ray spectroscopy as well as focused ion beam were used to characterize the surface morphology, investigate present damages and identify the chemical composition of residues. Macroscopic inspection showed increased crevice corrosion susceptibility of TiAl6V4 and REX 734 under severe simulated inflammatory conditions. CoCr28Mo6 cast alloy exhibited degraded areas next to Cr-and Mo-rich precipitations that were located within the opposed crevices. The results indicate that aggressive electrolyte composition and crevice heights of 50-500 μm are critical influencing factors on crevice corrosion of biomedical alloys. Furthermore, manufacturing-related microstructure of common implant alloys determines the deterioration of corrosion resistance. The developed method should be used to enhance the corrosion resistance of common implant biomaterials by an adapted microstructure.

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Section: Discussionmentioning

confidence: 99%

Microstructure‐dependent crevice corrosion damage of implant materialsCoCr28Mo6,TiAl6V4andREX734 under severe inflammatory conditions

et al. 2022

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“…In addition, inadequate dimensions and materials choice may make unpleasant changes for patients in terms of the hip joint squeaking [8]. This points to the fact that the causes of failures can be related to the shape and dimensions of the artificial hip, choice of the type [9], and material structure [10] as well as tribological processes [11,12].…”

Section: Introductionmentioning

confidence: 99%

Design of Custom Made Prosthesis of the Hip

et al. 2019

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Replacement of a natural hip joint with an artificial is one of the most commonly used surgical procedures in orthopaedic surgery. This paper describes the methodology of the hip joint prosthesis design, which presents the foundation for the automation of all stages of the development of custom-made prostheses. A general mathematical model based mostly on B-spline surfaces is used in order to define the prosthesis geometry. In order to verify the method, a software solution was developed and used for designing prostheses based on ten diagnostic images obtained by various methods. The results of the analysis of the ten designed prostheses, out of which five manufactured, show that deviations from the desired values are less than the errors caused by diagnostic imaging.

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