Mechanical and Corrosion Behaviour of Some Devices for Ostheosinthesis

Ghiban, Brânduşa

doi:10.4028/www.scientific.net/amr.23.257

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…For each specific implant, loading conditions can be complex and occur in an aggressive body environment so that good corrosionfatigue resistance is a major requirement. Also, in the case of joint prosthesis components is required a good wear resistance since wear debris generated result in unacceptable host reactions leading to implant loosening [2,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…For ostheosynthesis implants used in fracture repair the requirements are less stringent since these usually can be removed following fracture healing (in generally, after a few months) although this is not always done in practice [7].…”

Section: Introductionmentioning

confidence: 99%

“…While it is well known that chloride solutions are among the most aggressive and corrosive to metals, the ionic composition and protein concentration in body fluids complicate the nascent understanding of biomedical corrosion even further. Variations in alloy compositions can lead to subtle differences in mechanical, physical, or electrochemical properties [3,7]. However, these differences are minor compared with the potential variability caused by differences in fabrication methodology, heat treatment, cold working, and surface finishing, where surface treatments are particularly important for corrosion and wear properties.…”

Section: Introductionmentioning

confidence: 99%

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Fractographic Evaluation of the Metallic Materials for Medical Applications

Ghiban

Varlan

Niculescu

et al. 2017

KEM

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The manner of studying of the fracture modes could be done through fractography. Fractography is the study of fracture surface morphologies and it gives an insight into damage and failure mechanisms, underpinning the development of physically-based failure criteria. In composites research it provides a crucial link between predictive models and experimental observations. Fractographic methods are routinely used to determine the cause of failure in all engineering structures, especially in product failure and the practice of forensic engineering or failure analysis. In material science research, fractography is used to develop and evaluate theoretical models of crack growth behavior. One of the aims of fractographic examination is to determine the cause of failure by studying the characteristics of a fracture surface. Different types of crack growth produce characteristic features on the surface, which can be used to help identify the failure mode. The overall pattern of cracking can be more important than a single crack, however, especially in the case of brittle behavior materials. Initial fractographic examination is commonly carried out on a macro scale utilizing low power optical microscopy and oblique lighting techniques to identify the extent of cracking, possible modes and likely origins. When it is needed to identify the nature of failure, an analysis at high magnification is required and scanning electron microscopy (SEM) seems to be the best choice. The problem of fracture behavior of biometallic materials is a real one, being well and repeatedly presented in literature. Variations in alloy compositions can lead to subtle differences in mechanical, physical, or electrochemical properties. However, these differences are minor compared with the potential variability caused by differences in fabrication methodology, heat treatment, cold working, and surface finishing, where surface treatments are particularly important for corrosion and wear properties. The aim of this paper, therefore, is to summarize the different types of metals and alloys used as biomaterials, the corrosion of metals in the human body, and different failure damages of metallic implants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fractographic Evaluation of the Metallic Materials for Medical Applications

Ghiban

Varlan

Niculescu

et al. 2017

KEM

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“…Materials science dealing with continuous improvement and specifications of new polymer composite materials. that they are more biocompatible and suitable for implantation in the body [1][2][3][4][5][6]. Certainly, future will build more adequate systems using metallic materials, but until they are properly prepared, we will continue to rely on metals and alloys for an increasing number of surgeries involving prosthesis implantation.…”

Section: Introductionmentioning

confidence: 99%

Failure Modes of the Biometallic Materials - Case Study

Ghiban¹

2017

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Hip fractures/arthrosis were, still are and will be a challenge for the orthopedic surgeon. In this paper we conducted a case study on a rod used for hip replacement due to coxartrosis. The implant was used for hip replacement for NC patient aged 82 years. After twelve months the patient returns for the ablation of osteosynthesis material. Clinical and strengthen the fracture hip is found radiologic hypertrophic and degradation plaque. It was used a rod implant, on which were made following investigations in order to establish the causes that led to the fracture, namely: determining the chemical composition through spectral analysis, analysis macrostructural in stereo, microstructural analysis optical microscope metallographic respectively analysis fractogr aphic electron microscope streak. Complex analysis of the fracture surfaces of the hip prosthesis has led to the ultimate conclusion that the material has been made the hip prosthesis is inadequate chemical purity satisfactory embedding, which has led to breakage within an area of non-homogeneous structure.

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“…While the mainstay of treatment has been reamed interlocking intramedullary nailing, a variety of treatment options exist for solitary fractures or fractures with associated injury. Lately there have been substantial efforts to achieve a perfect material to replace part of a living system that has intimate contact with living tissue, but this is not easy because the biological environment is very aggressive, body rejecting any material which does not belong [6][7][8][9]. Present, there are mainly three types of biomaterials which are used for temporary or permanent trauma implants, such as stainless steel and titanium based alloys.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical Failure Analysis of Intramedullary Nail Used for Femoral Fracture Stabilization

Ghiban

Antoniac

Gheorghe

et al. 2016

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Currently orthopedics challenge is the use of intramedullary nails to straighten diaphyseal femoral fractures. In this paper it was conducted a case study on an intramedullary nail used for femoral fracture stabilization, in the case of one young patient. The evolution was unfavorable to the fracture site and the implant failed after three month of first surgical intervention. Intramedullary nail dimensions were 300mm length and 10mm in diameter. The following investigations were made in order to establish the failure causes: determination of the chemical composition through spectral analysis, macrostructural analysis using stereomicroscopy, optical microstructural analysis using optical microscopy, fractographic analysis using scanning electron microscopy. The final conclusions showed that the metallic biomaterial used for manufacturing the intramedullary nail was approximately an austenitic stainless steel AISI 316L, but with major microstructural defects. Macro-structural analysis revealed the presence of two zones of cracking, which are very rare at austenitic stainless steels. Also breaking with a fragile character has radial front tear propagation. In longitudinal section, cracks were evidenced due to the extraction operation and also the presence of corrosion products was shown. From fractographic analysis it was determined that intramedullary nail failure was predominantly through the mechanism of brittle fracture that took place at the point of maximum bending of the implant fragile.

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Mechanical and Corrosion Behaviour of Some Devices for Ostheosinthesis

Cited by 3 publications

References 4 publications

Fractographic Evaluation of the Metallic Materials for Medical Applications

Fractographic Evaluation of the Metallic Materials for Medical Applications

Failure Modes of the Biometallic Materials - Case Study

Metallurgical Failure Analysis of Intramedullary Nail Used for Femoral Fracture Stabilization

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