Effect of strain relaxations on heteroepitaxial metal-on-metal island nucleation and superlattice formation: Fe on Cu(111)

2009 ◽  
Vol 79 (19) ◽  
Author(s):  
N. N. Negulyaev ◽  
V. S. Stepanyuk ◽  
L. Niebergall ◽  
P. Bruno ◽  
W. Auwärter ◽  
...  
Keyword(s):  
Island Nucleation ◽  
Metal On Metal ◽  
Metal Island

Effect of oxide vacancies on metal island nucleation

2002 ◽  
Vol 515 (2-3) ◽  
pp. L481-L486 ◽  
Author(s):  
A Bogicevic ◽  
D.R Jennison
Keyword(s):  
Island Nucleation ◽  
Metal Island

Role of boundaries in the crystallization of amorphous films

1988 ◽  
Vol 46 ◽  
pp. 626-627
Author(s):  
D. A. Smith
Keyword(s):  
Low Temperature ◽  
Amorphous State ◽  
Nucleation And Growth ◽  
Amorphous Films ◽  
Island Nucleation ◽  
Surface Steps ◽  
Transmission Electron ◽  
Component Systems ◽  
Temperature Deposition

The nucleation and growth processes which lead to the formation of a thin film are particularly amenable to investigation by transmission electron microscopy either in situ or subsequent to deposition. In situ studies have enabled the observation of island nucleation and growth, together with addition of atoms to surface steps. This paper is concerned with post-deposition crystallization of amorphous alloys. It will be argued that the processes occurring during low temperature deposition of one component systems are related but the evidence is mainly indirect. Amorphous films result when the deposition conditions such as low temperature or the presence of impurities (intentional or unintentional) preclude the atomic mobility necessary for crystallization. Representative examples of this behavior are CVD silicon grown below about 670°C, metalloids, such as antimony deposited at room temperature, binary alloys or compounds such as Cu-Ag or Cr O2, respectively. Elemental metals are not stable in the amorphous state.

Eosinophilic Metallosis: A Newly Described Entity in Failed Metal-on-Metal Arthroplasty

2016 ◽  
Vol 26 (4) ◽  
pp. 341-346
Author(s):  
Brandon Levy ◽  
A. Hanflik ◽  
E. Bryk ◽  
V. J. Vigorita
Keyword(s):  
Metal On Metal

scholarly journals Whole blood chromium concentration is very rarely elevated independently of whole blood cobalt

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Olli Lainiala ◽  
Mari Karsikas ◽  
Aleksi Reito ◽  
Antti Eskelinen
Keyword(s):  
Whole Blood ◽  
Cost Savings ◽  
Chromium Concentration ◽  
Continuous Variables ◽  
Metal Debris ◽  
Screening Guidelines ◽  
Metal On Metal ◽  
Hip Replacements

AbstractDue to the risk of adverse reactions to metal debris resulting from increased wear of the arthroplasty more than one million metal-on-metal (MoM) hip replacements worldwide are in active follow-up. Follow-up usually includes measurement of both whole blood cobalt (Co) and chromium (Cr) concentrations. Our experience is that Cr is seldom independently elevated. We wanted to ascertain whether blood Cr measurements could be omitted from follow-up protocols without lowering the quality of follow-up. We identified 8438 whole blood Co and Cr measurements performed without or prior to revision surgery. When the cut-off levels 5 µg/L and 7 µg/L were used, Cr was independently elevated in only 0.5% (95% confidence interval, CI, 0.3 to 0.6) and 0.2% (CI 0.1 to 0.3) of the measurements. The models with continuous variables showed that the higher the blood metal concentrations are the lower the percentage of measurements with Cr higher than Co. Our results suggest that whole blood Cr is very rarely independently elevated and therefore the authorities should consider omitting Cr measurements from their screening guidelines of MoM hip replacements. We believe this change in practice would simplify follow-up and lead to cost savings without decreasing the quality of follow-up.

scholarly journals Uncemented versus cemented arthroplasty after metal-on-metal total hip replacement in patients with femoral neck fractures: a retrospective study

2021 ◽  
Vol 49 (5) ◽  
pp. 030006052110122
Author(s):  
Wenlu Liu ◽  
Huanyi Lin ◽  
Xianshang Zeng ◽  
Meiji Chen ◽  
Weiwei Tang ◽  
...  
Keyword(s):  
Femoral Neck ◽  
Clinical Outcomes ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Femoral Neck Fractures ◽  
Harris Hip Score ◽  
Complication Rates ◽  
Total Hip ◽  
Metal On Metal

Objective To compare the clinical outcomes of primary metal-on-metal total hip replacement (MoM-TR) converted to uncemented total hip replacement (UTR) or cemented total hip replacement (CTR) in patients with femoral neck fractures (AO/OTA: 31B/C). Methods Patient data of 234 UTR or CTR revisions after primary MoM-TR failure from March 2007 to January 2018 were retrospectively identified. Clinical outcomes, including the Harris hip score (HHS) and key orthopaedic complications, were collected at 3, 6, and 12 months following conversion and every 12 months thereafter. Results The mean follow-up was 84.12 (67–100) months for UTR and 84.23 (66–101) months for CTR. At the last follow-up, the HHS was better in the CTR- than UTR-treated patients. Noteworthy dissimilarities were correspondingly detected in the key orthopaedic complication rates (16.1% for CTR vs. 47.4% for UTR). Statistically significant differences in specific orthopaedic complications were also detected in the re-revision rate (10.3% for UTR vs. 2.5% for CTR), prosthesis loosening rate (16.3% for UTR vs. 5.9% for CTR), and periprosthetic fracture rate (12.0% for UTR vs. 4.2% for CTR). Conclusion In the setting of revision of failed primary MoM-TR, CTR may demonstrate advantages over UTR in improving functional outcomes and reducing key orthopaedic complications.

scholarly journals Small-head metal on metal total hip arthroplasty is associated with a high rate of complication and reoperation at mid-term follow-up

2021 ◽  
Vol 9 ◽  
pp. 205031212110147
Author(s):  
Nobuhiko Sumiyoshi ◽  
Kazuhiro Oinuma ◽  
Yoko Miura
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Adverse Reactions ◽  
Small Diameter ◽  
High Rate ◽  
Metal Debris ◽  
Total Hip ◽  
Metal On Metal ◽  
Small Head

Background: Adverse reactions to metal debris are significant complications after metal-on-metal total hip arthroplasty. Recently, late appearances of adverse reactions to metal debris and subsequent need for reoperations have been reported with small-diameter head metal-on-metal devices. We retrospectively investigated mid-term clinical outcomes of small-head metal-on-metal total hip arthroplasty. Methods: We reviewed 159 hips in 139 patients who had a small-head metal-on-metal total hip arthroplasty (M2a Taper; Biomet, Warsaw, IN) with a minimum 5-year follow-up and documented postoperative complications. Results: Focal osteolysis in either the femur or acetabulum was observed in 12 hips (7.5%, 44 months after surgery on average), with pseudotumor observed in 8 hips (5%, 120 months after surgery on average). Four hips (2.5%) had dislocations (84 months after surgery on average) and six hips (3.8%, 122 months after surgery on average) underwent reoperation. Conclusion: Small-head metal-on-metal total hip arthroplasty is associated with a high degree of complications at mid-term follow-up period. Considering this, we discourage the use of metal-on-metal total hip arthroplasty regardless of head size.

scholarly journals Chromium and cobalt intoxication mimicking mitochondriopathy

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Tim W. Rattay ◽  
Torsten Kluba ◽  
Ludger Schöls
Keyword(s):  
Diabetes Mellitus ◽  
Weight Loss ◽  
Mitochondrial Dna ◽  
Wear Debris ◽  
Hip Prosthesis ◽  
Mitochondrial Cytopathy ◽  
Whole Exome ◽  
Metal On Metal ◽  
Metal Wear ◽  
History Of

AbstractA 53-year old male with a history of progressive visual impairment, hearing loss, peripheral neuropathy, poorly controlled diabetes mellitus, cardiomyopathy, and weight loss was referred to the rare disease center due to the suspicion of mitochondrial cytopathy. In line with mitochondrial dysfunction, lactate in CSF was increased. Genetic testing by whole-exome sequencing and mitochondrial DNA did not reveal a likely cause. The case remained unsolved until he developed pain in his right hip, where he had received total hip arthroplasty 12 years earlier. An orthopedic evaluation revealed substantial shrinkage of the head of the hip prosthesis. Due to metal-on-metal wear, debris chromium and cobalt levels in serum were massively increased and significantly improved with multisystemic impairment after exchanging the defective implant.

Sign in / Sign up

Export Citation Format

Share Document