A Servoelectric Apparatus with Potentiostat to Study the Fretting Corrosion of Cobalt-Chromium–Titanium Alloy Couples

2015 ◽  
pp. 303-320 ◽  
Author(s):  
Johnny Dufils ◽  
Michel P. Laurent ◽  
Joachim Kunze ◽  
Dmitry Royhman ◽  
Mathew T. Mathew ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Cobalt Chromium ◽  
Fretting Corrosion

scholarly journals Fretting and Corrosion in Modular Shoulder Arthroplasty: A Retrieval Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Johannes A. Eckert ◽  
Ulrike Mueller ◽  
Sebastian Jaeger ◽  
Benjamin Panzram ◽  
J. Philippe Kretzer
Keyword(s):  
Titanium Alloy ◽  
Shoulder Arthroplasty ◽  
Metal Ion ◽  
Total Shoulder Arthroplasty ◽  
Elevated Serum ◽  
Cobalt Chromium ◽  
Weak Correlation ◽  
Metal Debris ◽  
Total Shoulder Arthroplasties ◽  
Shoulder Arthroplasties

Tribocorrosion in taper junctions of retrieved anatomic shoulder arthroplasty implants was evaluated. A comparison of the tribocorrosion between cobalt-chromium and titanium alloy stems was conducted and the observations were correlated with the individual’s clinical data. Adverse effects caused by metal debris and subsequent elevated serum metal ion levels are frequently reported in total hip arthroplasty. In total shoulder arthroplasty, to date only a small number of retrieval analyses are available and even fewer address the issue of tribocorrosion at the taper junctions. A total of 36 retrieved hemiarthroplasties and total shoulder arthroplasties were assessed using the modified Goldberg score. The prevalence of fretting and corrosion was confirmed in this cohort. Titanium stems seem to be more susceptible to damage caused by tribocorrosion than cobalt-chromium stems. Furthermore, stemless designs offered less tribocorrosion at the taper junction than stemmed designs. A weak correlation between time to revision and increased levels of tribocorrosion was seen. Whether or not tribocorrosion can lead to adverse clinical reactions and causes failure of shoulder arthroplasties remains to be examined.

In vitro effects of macrophages on orthopaedic implant alloys and local release of metallic alloy components

2020 ◽  
Vol 102-B (7_Supple_B) ◽  
pp. 116-121
Author(s):  
G. Heise ◽  
C. M. Black ◽  
R. Smith ◽  
B. R. Morrow ◽  
W. M. Mihalko
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Metal Ion ◽  
Oxide Surface ◽  
Stainless Steel Surface ◽  
Orthopaedic Implant ◽  
Cobalt Chromium ◽  
Ion Release ◽  
Metal Ion Release

Aims This study aimed to determine if macrophages can attach and directly affect the oxide layers of 316L stainless steel, titanium alloy (Ti6Al4V), and cobalt-chromium-molybdenum alloy (CoCrMo) by releasing components of these alloys. Methods Murine peritoneal macrophages were cultured and placed on stainless steel, CoCrMo, and Ti6Al4V discs into a 96-well plate. Cells were activated with interferon gamma and lipopolysaccharide. Macrophages on stainless steel discs produced significantly more nitric oxide (NO) compared to their control counterparts after eight to ten days and remained elevated for the duration of the experiment. Results On stainless steel, both nonactivated and activated cell groups were shown to have a significant increase in metal ion release for Cr, Fe, and Ni (p < 0.001, p = 0.002, and p = 0.020 respectively) compared with medium only and showed macrophage-sized corrosive pits on the stainless steel surface. On titanium alloy discs there was a significant increase in aluminum (p < 0.001) among all groups compared with medium only. Conclusion These results indicated that macrophages were able to attach to and affect the oxide surface of stainless steel and titanium alloy discs. Cite this article: Bone Joint J 2020;102-B(7 Supple B):116–121.

Effect of Low-Temperature Oxidation and Oxynitriding on the Fretting Corrosion of VT22 Titanium Alloy

2012 ◽  
Vol 48 (2) ◽  
pp. 213-218
Author(s):  
O. I. Dukhota ◽  
I. M. Pohrelyuk ◽  
O. H. Molyar ◽  
A. T. Pichuhin ◽  
O. H. Luk’yanenko
Keyword(s):  
Titanium Alloy ◽  
Low Temperature ◽  
Fretting Corrosion ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Vt22 Titanium Alloy

scholarly journals Studying the effect of different RPD design and materials on reduced bone support, a FEA study.

2018 ◽  
Vol 40 (1) ◽  
pp. 5-10
Author(s):  
Wasmaa S Mahmood ◽  
Souza A Aziz ◽  
Imad A Jebouri
Keyword(s):  
Titanium Alloy ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Modulus Of Elasticity ◽  
Class I ◽  
Cobalt Chromium ◽  
Bone Material ◽  
Partial Denture ◽  
Significant Difference ◽  
Design Type

Aim of the study: To study the effect of reduced level of bone support on stress concentration and distribution. Also comparing the effect of different metals (gold, cobalt-chromium, and titanium) on alveolar supporting bone. Material and methods: A FEA method is used on a reduced bone support class I Kennedy classification, with three different rest positions (mesial, distal, mesial and distal) Co-Cr partial denture; Then changing the modulus of elasticity of the chrome-cobalt, to study the effect of gold and titanium alloy on the supporting bone surrounding the abutment in terms of stress distribution. Results: results revealed that best design type is by placing mesial and distal rest on abutment, also when comparing the three types of metals (Co-Cr, titanium, gold), there was no significant difference among the three metals.

scholarly journals Investigating the Impact of Knee Prosthesis in Patients’ Body on Radiation Dose Distribution: A Monte Carlo Approach

2019 ◽  
Author(s):  
M R Bayatiani ◽  
F Seif ◽  
S Hamidi ◽  
S Bagheri
Keyword(s):  
Monte Carlo ◽  
Titanium Alloy ◽  
Dose Reduction ◽  
Alloy Steel ◽  
Dose Distribution ◽  
Knee Prosthesis ◽  
Cobalt Chromium ◽  
Radiotherapy Dose ◽  
Cobalt Chromium Molybdenum ◽  
The Impact

Introduction: Metal prostheses in patients affect the radiotherapy dose distribution. Metal prostheses with high density and atomic number cause major changes in scattering and attenuation of radiation. The present study aims to assess the impact of metal knee prosthesis with various dimensions and materials on radiotherapy dose distribution. Material and Methods: In this research, the Varian Linac and water phantom were simulated using the MCNPX code. Dose distribution of photon beam in a water phantom, with and without the presence of knee prostheses made of cobalt-chromium-molybdenum alloy, steel, titanium, and titanium alloy used in men and women was investigated using the Monte Carlo simulation.Results: The prosthesis led to an increase in dose in comparison with cases that there was used no prosthesis. According to values of the depth dose percentage, the maximum dose increase was found to be 6.8%, 6.1%, 4%, and 4.29%, and dose reduction 41.18%, 40.66%, 37.76%, and 37.51% for prosthetics with men’s knee dimensions made of cobalt-chromium-molybdenum alloy, steel, titanium alloy, and titanium, respectively. Above all, does increasing to 6.4%, 5.9%, 3.8%, and 3.94% and doses reducing to 40.87%, 40.36%, 36.94%, and 36.69 were observed in prosthetics for women. The highest amount of dose reduction for men’s prostheses made of mentioned materials was found to be 48.75%, 47.7%, 45%, and 45.8%, respectively. In addition, it was 46.36%, 45.8%, 43.8%, and 43.95% for women’s prostheses, respectively.Conclusion: Material will have a significant impact if a part of the knee bone places behind the prosthesis. According to the obtained values, it is recommended to utilize prostheses made of titanium and titanium alloys for knee arthroplasty. The prosthesis can either increase or decrease dose in tumor or lead to increase dose at organs at risk.

Effect of Counterface Material on the Characteristics of Retrieved Uncemented Cobalt-Chromium and Titanium Alloy Total Hip Replacements

1996 ◽  
Vol 210 (3) ◽  
pp. 191-195 ◽  
Author(s):  
K Brummitt ◽  
C S Hardaker ◽  
P J J McCullagh ◽  
K J Drabu ◽  
R A Smith
Keyword(s):  
Titanium Alloy ◽  
Clinical Performance ◽  
Titanium Implants ◽  
Cobalt Chromium ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Laser Profilometry ◽  
Cobalt Chromium Molybdenum ◽  
Current Standards

A number of total hip components explanted at revision with bearing surfaces in either cobalt-chromium-molybdenum alloy or titanium-6% aluminium-4% vanadium alloy were examined and compared to contemporaneously manufactured but unused items; particular attention was paid to the bearing surfaces which were examined visually, by low-power microscopy, scanning electron microscopy (SEM), confocal microscopy, white light interferometry, laser profilometry and conventional stylus profilometry. The cobalt alloy heads maintained their surface finish well over periods up to 12 years. The titanium implants became badly damaged over much shorter periods although even badly scratched heads continued to meet the current standards for titanium alloy heads. Analysis showed that the damage to the titanium alloy heads was not a random but a well-defined process of scarring of a consistent size created by abrasion with small particles of bone. These damaged heads had the potential to wear the matching UHMWPE components rapidly creating large amounts of polymer debris. The finding that measurement of these damaged heads is within current standards raises concerns as to whether current standards incorporate fully the requirements for clinical performance.

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