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Implant corrosion

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https://www.readbyqxmd.com/read/28102447/analysing-a-mechanism-of-failure-in-retrieved-magnetically-controlled-spinal-rods
#1
Vasiliki C Panagiotopoulou, Stewart K Tucker, Robert K Whittaker, Harry S Hothi, Johann Henckel, Julian J H Leong, Thomas Ember, John A Skinner, Alister J Hart
PURPOSE: We aim to describe a mechanism of failure in magnetically controlled growth rods which are used for the correction of the early onset scoliosis. METHODS: This retrieval study involved nine magnetically controlled growth rods, of a single design, revised from five patients for metal staining, progression of scoliosis, swelling, fractured actuator pin, and final fusion. All the retrieved rods were radiographed and assessed macroscopically and microscopically for material loss...
January 19, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28087160/mri-retrieval-analysis-and-histologic-evaluation-of-adverse-local-tissue-reaction-in-metal-on-polyethylene-total-hip-arthroplasty
#2
Scott R Nodzo, Christina I Esposito, Hollis G Potter, Chitranjan S Ranawat, Timothy M Wright, Douglas E Padgett
BACKGROUND: The severity and location of adverse local tissue reaction (ALTR) seen in metal-on-polyethylene total hip arthroplasty (THA) is not well described. METHODS: We retrospectively reviewed the records of patients who underwent a revision THA using our biomechanics database. We included all patients who underwent revision surgery for the diagnosis of ALTR with THA implants that had modularity solely at the head-neck junction and excluded patients with implant modularity at sites other than the head-neck junction...
December 8, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28073074/tribocorrosion-behavior-of-bio-functionalized-highly-porous-titanium
#3
F Toptan, A C Alves, A M P Pinto, P Ponthiaux
Titanium and its alloys are widely used in orthopedic and dental implants, however, some major clinical concerns such as poor wear resistance, lack of bioactivity, and bone resorption due to stress shielding are yet to be overcome. In order to improve these drawbacks, highly porous Ti samples having functionalized surfaces were developed by powder metallurgy with space holder technique followed by anodic treatment. Tribocorrosion tests were performed in 9g/L NaCl solution using a unidirectional pin-on-disc tribometer under 3N normal load, 1Hz frequency and 4mm track diameter...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28069511/in-vivo-characterization-of-magnesium-alloy-biodegradation-using-electrochemical-h2-monitoring-icp-ms-and-xps
#4
Daoli Zhao, Tingting Wang, Keaton Nahan, Xuefei Guo, Zhanping Zhang, Zhongyun Dong, Shuna Chen, Da-Tren Chou, Daeho Hong, Prashant N Kumta, William R Heineman
: The effect of widely different corrosion rates of Mg alloys on four parameters of interest for in vivo characterization was evaluated: (1) the effectiveness of transdermal H2 measurements with an electrochemical sensor for noninvasively monitoring biodegradation compared to the standard techniques of in vivo X-ray imaging and weight loss measurement of explanted samples, (2) the chemical compositions of the corrosion layers of the explanted samples by XPS, (3) the effect on animal organs by histology, and (4) the accumulation of corrosion by-products in multiple organs by ICP-MS...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28065626/choosing-a-femoral-head-a-survey-study-of-academic-adult-reconstructive-surgeons
#5
Sumon Nandi, Matthew S Austin
BACKGROUND: Our aim was to examine how academic adult reconstructive surgeons have interpreted evidence on femoral head material in total hip arthroplasty (THA). METHODS: A 16-question survey to evaluate attitudes toward ceramic and cobalt-chrome head use was emailed to 274 faculty at 42 US adult reconstruction fellowship programs. RESULTS: With 116 respondents, the response rate was 42.2%. Faculty use ceramic heads 72.9% of the time. The most common reason why respondents do not use ceramic heads is cost (44...
December 18, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28064103/why-do-some-titanium-alloy-total-hip-arthroplasty-modular-necks-fail
#6
Samo K Fokter, Andrej Moličnik, Rajko Kavalar, Primož Pelicon, Rebeka Rudolf, Nenad Gubeljak
BACKGROUND: Increased modularity in total hip arthroplasty (THA) through extra junction between the neck and the femoral stem is gaining popularity among orthopaedic community. However, the advantage of the additional junction is shadowed by an increased risk of mechanical failure. The aim of this study was to describe the exact mechanism of fracture of the modular femoral neck in an uncemented stem. METHODS: Clinical, metallurgical, and mechanical analysis including finite-element modelling and elemental-sensitive tissue analysis with the micro-PIXE method was performed on two patients treated with fully modular primary THA made from Titanium alloy of the same oval taper-cone design...
December 27, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28049056/one-step-fabrication-of-biomimetic-superhydrophobic-surface-by-electrodeposition-on-magnesium-alloy-and-its-corrosion-inhibition
#7
Yan Liu, Jingze Xue, Dan Luo, Huiyuan Wang, Xu Gong, Zhiwu Han, Luquan Ren
A facile, rapid and one-step electrodeposition process has been employed to construct a superhydrophobic surface with micro/nano scale structure on a Mg-Sn-Zn (TZ51) alloy, which is expected to be applied as a biodegradable biomedical implant materials. By changing the electrodeposition time, the maximum contact angle of the droplet was observed as high as 160.4°±0.7°. The characteristics of the as-prepared surface were conducted by field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR)...
December 18, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28027481/toward-improved-mechanical-tribological-corrosion-and-in-vitro-bioactivity-properties-of-mixed-oxide-nanotubes-on-ti-6al-7nb-implant-using-multi-objective-pso
#8
A R Rafieerad, A R Bushroa, B Nasiri-Tabrizi, S H A Kaboli, S Khanahmadi, Ahmad Amiri, J Vadivelu, F Yusof, W J Basirun, K Wasa
Recently, the robust optimization and prediction models have been highly noticed in district of surface engineering and coating techniques to obtain the highest possible output values through least trial and error experiments. Besides, due to necessity of finding the optimum value of dependent variables, the multi-objective metaheuristic models have been proposed to optimize various processes. Herein, oriented mixed oxide nanotubular arrays were grown on Ti-6Al-7Nb (Ti67) implant using physical vapor deposition magnetron sputtering (PVDMS) designed by Taguchi and following electrochemical anodization...
December 5, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28024637/effect-of-ca-p-ratio-on-the-structural-and-corrosion-properties-of-biomimetic-cap-coatings-on-zk60-magnesium-alloy
#9
Kada Xia, Hui Pan, Taolei Wang, Shangjun Ma, Junchao Niu, Zhen Xiang, Yiming Song, Huawei Yang, Xiaoshan Tang, Wei Lu
Magnesium and its alloys have attracted much attention as metallic biodegradable implants for their excellent biocompatibility and mechanical properties. However, magnesium has a poor corrosion resistance, causing its rapid degrading in vivo via an electrochemical reaction, which has become a major obstacle to their applications in implants. In this work, CaP coating was successfully coated on the ZK60 magnesium alloys by a simple hydrothermal deposition method. The mechanisms of the hydrothermal reactions of CaP coatings on Mg substrate are described in details...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024610/alkalescent-nanotube-films-on-a-titanium-based-implant-a-novel-approach-to-enhance-biocompatibility
#10
Yanxian Zhang, Chaofang Dong, Sefei Yang, Junsheng Wu, Kui Xiao, Yunhua Huang, Xiaogang Li
The interfacial pH value has a marked effect on cell viability because the pro-mineralization activity of osteoblasts increases at alkaline extracellular pH, whereas the pro-resorptive activity of osteoclasts increases under more acidic conditions. To obtain the more favorable alkaline interface, we developed a novel nanotube layer that was incorporated with magnesium oxide on a titanium implant substrate (MgO/NT/Ti) via ethylenediamine tetraacetic acid (EDTA) chelation. This facile immersion-annealing process successfully created a homogeneous magnesium oxide layer with sustained release kinetics and superior hydrophilicity according to the surface characterization and microenvironment measurement...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28013101/ex-vivo-blood-vessel-bioreactor-for-analysis-of-the-biodegradation-of-magnesium-stent-models-with-and-without-vessel-wall-integration
#11
Juan Wang, Lumei Liu, Yifan Wu, Manfred F Maitz, Zhihong Wang, Youngmi Koo, Ansha Zhao, Jagannathan Sankar, Deling Kong, Nan Huang, Yeoheung Yun
: Current in vitro models fail in predicting the degradation rate and mode of magnesium (Mg) stents in vivo. To overcome this, the microenvironment of the stent is simulated here in an ex vivo bioreactor with porcine aorta and circulating medium, and compared with standard static in vitro immersion and with in vivo rat aorta models. In ex vivo and in vivo conditions, pure Mg wires were exposed to the aortic lumen and inserted into the aortic wall to mimic early- and long-term implantation, respectively...
December 21, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/28009708/trunnion-corrosion-in-metal-on-polyethylene-total-hip-arthroplasty-a-case-series
#12
Sivashanmugam Raju, Karthikeyan Chinnakkannu, Mohan K Puttaswamy, Matthew J Phillips
INTRODUCTION: Modular total hip arthroplasty implants can help the operating surgeon reproduce the optimum limb length and offset; however, the modularity can lead to fretting and corrosion with associated metal-related problems. Although metal-on-metal bearings are often reported to have problems, recent case reports suggest that the problems can occur with any articulation, usually as a result of problems at the head/neck junction. METHODS: We retrospectively reviewed three cases of a specific implant combination with nontraumatic trunnion failure, with two cases presenting as acute complete dissociation of the femoral head from the neck...
February 2017: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/28005292/early-results-using-a-biodegradable-magnesium-screw-for-modified-chevron-osteotomies
#13
Christian Plaass, Sarah Ettinger, Lena Sonnow, Soeren Koenneker, Yvonne Noll, Andreas Weizbauer, Janin Reifenrath, Leif Claassen, Kiriakos Daniilidis, Christina Stukenborg-Colsman, Henning Windhagen
This is the first larger study analyzing the use of magnesium-based screws for fixation of modified Chevron osteotomies in hallux valgus surgery. Forty-four patients (45 feet) were included in this prospective study. A modified Chevron osteotomy was performed on every patient and a magnesium screw used for fixation. The mean clinical follow up was 21.4 weeks. The mean age of the patients was 45.5 years. Forty patients could be provided with the implant, in four patients the surgeon decided to change to a standard metallic implant...
December 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28002921/restoring-the-femoral-offset-prevent-early-migration-of-the-stem-in-total-hip-arthroplasty-an-ebra-fca-study
#14
G Vicenti, G Solarino, A Spinarelli, M Carrozzo, G Picca, R Maddalena, F Rifino, B Moretti
The use of modular stems is still debated and controversial. Some authors have highlighted a number of disadvantages of modular prostheses including high costs, the tendency to fracture, the fretting and corrosion and the increased production of debris. Other authors have emphasized several advantages to adapt the prosthesis to the morphometric differences of patients, to allow better accuracy in restoring the anatomy and biomechanics of hip joint. The advantages of the modular devices appear to be more evident in patients with developmental dysplasia of the hip (DDH)...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/27987785/electrophoretic-deposition-of-silica-and-its-composite-coatings-on-ti-6al-4v-and-its-in-vitro-corrosion-behaviour-for-biomedical-applications
#15
M Chellappa, U Vijayalakshmi
Novel bioceramics have an intriguing role in implants and prostheses as surface protecting agents. These bioceramics have promising features such as biocompatible, bioactive, and corrosion-resistant natures. Among bioceramics, silica glass and its composite unravel its better desirability against corrosion and wear with interfacial bone bonding capability in physiological systems by nucleating calcium phosphates over the surface, thereby enhancing the osteoinductive property. In the current study, SiO2 and ZnO were obtained by processing silica and zinc oxide precursors at low temperature using low thermal volatilization sol-gel method...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987734/bioactivity-and-electrochemical-behavior-of-hydroxyapatite-silicon-multi-walled-carbon-nano-tubes-composite-coatings-synthesized-by-epd-on-niti-alloys-in-simulated-body-fluid
#16
V Khalili, J Khalil-Allafi, J Frenzel, G Eggeler
In order to improve the surface bioactivity of NiTi bone implant and corrosion resistance, hydroxyapatite coating with addition of 20wt% silicon, 1wt% multi walled carbon nano-tubes and both of them were deposited on a NiTi substrate using a cathodic electrophoretic method. The apatite formation ability was estimated using immersion test in the simulated body fluid for 10days. The SEM images of the surface of coatings after immersion in simulated body fluid show that the presence of silicon in the hydroxyapatite coatings accelerates in vitro growth of apatite layer on the coatings...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987714/microstructure-surface-characterization-and-long-term-stability-of-new-quaternary-ti-zr-ta-ag-alloy-for-implant-use
#17
C Vasilescu, P Osiceanu, J M Calderon Moreno, S I Drob, S Preda, M Popa, I Dan, M Marcu, M Prodana, I A Popovici, D Ionita, E Vasilescu
The novel Ti-20Zr-5Ta-2Ag alloy was characterised concerning its microstructure, morphology, mechanical properties, its passive film composition and thickness, its long-term electrochemical stability, corrosion resistance, ion release rate in Ringer solution of acid, neutral and alkaline pH values and antibacterial activity. The new alloy has a crystalline α microstructure (by XRD). Long-term XPS and SEM analyses show the thickening of the passive film and the deposition of hydroxyapatite in neutral and alkaline Ringer solution...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987699/effects-of-simulated-inflammation-on-the-corrosion-of-316l-stainless-steel
#18
Emily K Brooks, Richard P Brooks, Mark T Ehrensberger
Stainless steel alloys, including 316L, find use in orthopaedics, commonly as fracture fixation devices. Invasive procedures involved in the placement of these devices will provoke a local inflammatory response that produces hydrogen peroxide (H2O2) and an acidic environment surrounding the implant. This study assessed the influence of a simulated inflammatory response on the corrosion of 316L stainless steel. Samples were immersed in an electrolyte representing either normal or inflammatory physiological conditions...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987677/is-there-scientific-evidence-favoring-the-substitution-of-commercially-pure-titanium-with-titanium-alloys-for-the-manufacture-of-dental-implants
#19
REVIEW
Jairo M Cordeiro, Valentim A R Barão
The development of Ti alloys to manufacture dental implants has emerged in recent years due to the increased failure of commercially pure titanium (cpTi) implants. Thus, this study reviews existing information about the mechanical, chemical, electrochemical, and biological properties of the main Ti alloys developed over the past few years to provide scientific evidence in favor of using Ti-based alloys as alternative to cpTi. Ti alloys may be considered viable substitutes in the fabrication of dental implants...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987658/a-novel-approach-to-fabrication-of-three-dimensional-porous-titanium-with-controllable-structure
#20
Dong Wang, Qiuyan Li, Mingqin Xu, Guofeng Jiang, Yunxia Zhang, Guo He
A new approach to fabrication of porous titanium by using the molybdenum wire as space holder was developed, in which titanium liquid was cast into the entangled molybdenum wires in a vacuum environment, and followed by etching off the space holder material in an aqua regia solution. This infiltration casting and acid corrosion method fabricated the porous titanium with different porosities with a pore diameter of 0.4mm. The porous titanium with the porosity of 32-47% exhibited the Young's modulus in the range of 23-62GPa and the yielding strength in the range of 76-192MPa...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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