scholarly journals Concordance between laboratories in metal ion testing in patients with metal-on-metal hip implants

2019 ◽  
Vol 62 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Raghav Saini ◽  
Pam Railton ◽  
Jessica Boyd ◽  
Hossein Sadrzadeh ◽  
James N. Powell
Keyword(s):  
Metal Ion ◽  
Hip Implants ◽  
Metal On Metal

scholarly journals Blood Metal Ion Thresholds to Identify Patients with Metal-on-Metal Hip Implants at Risk of Adverse Reactions to Metal Debris

2017 ◽  
Vol 99A (18) ◽  
pp. 1532-1539 ◽  
Author(s):  
Gulraj S. Matharu ◽  
Fiona Berryman ◽  
Andrew Judge ◽  
Aleksi Reito ◽  
Jamie McConnell ◽  
...  
Keyword(s):  
At Risk ◽  
Metal Ion ◽  
Adverse Reactions ◽  
Hip Implants ◽  
Metal Debris ◽  
Metal On Metal

scholarly journals Does modularity of metal-on-metal hip implants increase cobalt: chromium ratio?

2019 ◽  
pp. 112070001987363
Author(s):  
Kevin C Ilo ◽  
Karim Aboelmagd ◽  
Harry S Hothi ◽  
Asaad Asaad ◽  
John A Skinner ◽  
...  
Keyword(s):  
Metal Ion ◽  
Hip Implants ◽  
Cobalt Chromium ◽  
Metal Debris ◽  
Material Loss ◽  
Total Hip ◽  
Modular Stem ◽  
Metal On Metal ◽  
Hip Replacements ◽  
Hip Arthroplasties

Background: Blood metal ion levels are used in the surveillance of metal-on-metal (MoM) hip implants. Modular implants contain an extra source of metal debris that may affect the ratio of metal ions in the blood. Methods: This was a retrospective study of 503 patients with hip replacements made by a single manufacturer (Smith & Nephew, Warwick, UK) with the same bearing surface. There were 54 total hip arthroplasties, 35 Birmingham Mid-Head Resections and 414 hip resurfacings. Whole blood metal ion levels and their ratios were analysed to investigate the effect of a modular junction. Results: The cobalt:chromium ratios were greater in the total hip arthroplasty group (mean 2.3:1) when compared to the resurfacings group (mean 1.3:1, p = <0.05) and Birmingham Mid-Head Resection group (mean 1.1:1, p = 0.11). Conclusions: This study demonstrated a trend for a higher cobalt:chromium ratio in patients with MoM total hip replacement that may be due to metal debris from the modular stem-head junction. Further work is required to correlate clinical data with retrieval analysis to confirm the effect of taper material loss on the cobalt:chromium ratio.

scholarly journals Relationship between Pelvic Incidence Angle and Blood Concentration of Chromium and Cobalt Ions after Metal-on-Metal Hip Replacement: A Brief Report

2017 ◽  
Vol 107 (1) ◽  
pp. 91-94
Author(s):  
K. Pernaa ◽  
M. Saltychev ◽  
K. Mäkelä
Keyword(s):  
Blood Level ◽  
Hip Replacement ◽  
Metal Ion ◽  
Pelvic Incidence ◽  
Incidence Angle ◽  
Pearson Correlation ◽  
Blood Levels ◽  
Hip Implants ◽  
Cobalt Ions ◽  
Metal On Metal

Background and Aims: The wear of metal-on-metal hip implants may increase chromium or cobalt ion blood level. This phenomenon may depend among other things on the particularity of spinopelvic anatomy. The effect of pelvic incidence angle on the wear of metal-on-metal hip implants is not known. The objective of the study was to investigate whether such effect does exist. Material and Methods: The pelvic incidence and inclination of acetabular component angles of 89 patients after unilateral metal-on-metal hip replacement were compared with blood level of chromium and cobalt ions using Pearson correlation coefficient. Results: No significant correlations between pelvic incidence angle and the metal ion blood levels were observed. The correlation coefficients varied from −0.02 to 0.2 and all p values were >0.05. Conclusion: No evidence was found on the effect of pelvic incidence angle on metal wear after metal-on-metal hip replacement when measured by the blood levels of chromium and cobalt ions. It is reasonable to assume that other factors than pelvic tilt may affect the rate of implant wear.

scholarly journals Metal-on-metal total hip arthroplasty: does increasing modularity affect clinical outcome?

2020 ◽  
pp. 112070002097927
Author(s):  
Kevin C Ilo ◽  
Harry S Hothi ◽  
John A Skinner ◽  
Alister J Hart
Keyword(s):  
Metal Ion ◽  
Hip Prosthesis ◽  
Tissue Reaction ◽  
Bearing Surface ◽  
Adverse Local Tissue Reaction ◽  
Material Loss ◽  
Local Tissue ◽  
Local Tissue Reaction ◽  
Metal On Metal ◽  
Modular Implants

Background: Modularity of metal-on-metal (MoM) implants has come under scrutiny due to concerns regarding additional sources of metal debris. This study is a retrieval analysis of implants from the same manufacturer with the same MoM bearing surface. The difference between the implants was presence or absence of modular junctions. Methods: This is a retrospective study of 31 retrieved implants from 31 patients who received a Conserve Wright Medical MoM hip prosthesis. The 31 implants consisted of 16 resurfacings and 15 implants with modular junctions; 4 conventional THAs and 11 modular-neck THAs. Results: 43% of pre-revision MRI scans performed on resurfacing implants and 91% performed on the modular implants illustrated evidence of an adverse local tissue reaction. There was no difference in pre-revision blood metal ion levels or bearing surface wear between the resurfacings and modular implants. The neck-head tapers of the modular group showed low levels of material loss. However, the neck-stem tapers showed increased severity of corrosion and material loss Conclusions: The modular implants had an increased incidence of adverse local tissue reaction. This could be related to the presence of modular junctions, particular the neck-stem junction which showed increased susceptibly to corrosion

Biotribocorrosion of metal-on-metal hip replacements: How surface degradation can influence metal ion formation

2013 ◽  
Vol 65 ◽  
pp. 128-137 ◽  
Author(s):  
James Hesketh ◽  
Qingen Meng ◽  
Duncan Dowson ◽  
Anne Neville
Keyword(s):  
Metal Ion ◽  
Surface Degradation ◽  
Ion Formation ◽  
Metal On Metal ◽  
Hip Replacements

US regulator seeks advice on health risks of metal on metal hip implants

BMJ ◽  
2012 ◽  
Vol 344 (mar30 2) ◽  
pp. e2460-e2460
Author(s):  
D. Cohen
Keyword(s):  
Health Risks ◽  
Hip Implants ◽  
Metal On Metal

Wear and Lubrication of Metal-on-Metal Hip Implants

1999 ◽  
Vol 369 ◽  
pp. 10-24 ◽  
Author(s):  
Frank W. Chan ◽  
J. Dennis Bobyn ◽  
John B. Medley ◽  
Jan J. Krygier ◽  
Michael Tanzer
Keyword(s):  
Hip Implants ◽  
Metal On Metal

scholarly journals The Effect Of Different Bearing Surfaces On Metal Ion Levels In Urine Following 28 Mm Metal-On-Metal And 28 Mm Metal-On-Polyethylene Total Hip Arthroplasty

2013 ◽  
Vol 102 (3) ◽  
pp. 197-203 ◽  
Author(s):  
H. Tiusanen ◽  
K. Mäkelä ◽  
M. Kiilunen ◽  
P. Sarantsin ◽  
E. Sipola ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Metal Ion ◽  
Total Hip ◽  
Metal On Metal
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