scholarly journals Material loss at the taper junction of retrieved large head metal‐on‐metal total hip replacements

2013 ◽  
Vol 31 (11) ◽  
pp. 1677-1685 ◽  
Author(s):  
Ashley K. Matthies ◽  
Radu Racasan ◽  
Paul Bills ◽  
Liam Blunt ◽  
Suzie Cro ◽  
...  
Keyword(s):  
Material Loss ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Large Head ◽  
Metal On Metal ◽  
Hip Replacements

scholarly journals The hidden costs of metal-on-metal hip resurfacing: the financial and logistical implications of a change in hospital follow-up policy

2013 ◽  
Vol 95 (3) ◽  
pp. 88-91
Author(s):  
J Lloyd ◽  
I Starks ◽  
T Wainwright ◽  
R Middleton
Keyword(s):  
Hip Replacement ◽  
Hip Resurfacing ◽  
Surface Wear ◽  
Bearing Surface ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Large Head ◽  
Metal On Metal ◽  
Hip Replacements

Metal-on-metal (MoM) hip resurfacings (HRs) and large head total hip replacements (LHTHRs) were perceived by many as a surgical revolution, with clear advantages over the traditional metal-on-polyethylene total hip replacement (THR). This is especially the case for younger, active individuals in whom conventional THR has been associated with higher rates of aseptic loosening. In addition to less bearing surface wear, frequently cited advantages for HR include the preservation of femoral bone stock, lower dislocation rates, and superior function and activity scores.

scholarly journals Taper Design Affects Failure of Large-head Metal-on-metal Total Hip Replacements

2013 ◽  
Vol 472 (2) ◽  
pp. 564-571 ◽  
Author(s):  
Nader A. Nassif ◽  
Danyal H. Nawabi ◽  
Kirsten Stoner ◽  
Marcella Elpers ◽  
Timothy Wright ◽  
...  
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Large Head ◽  
Metal On Metal ◽  
Hip Replacements

scholarly journals MoM total hip replacements in Europe: a NORE report

2019 ◽  
Vol 4 (6) ◽  
pp. 423-429 ◽  
Author(s):  
Bart G. Pijls ◽  
Jennifer M. T. A. Meessen ◽  
Keith Tucker ◽  
Susanna Stea ◽  
Liza Steenbergen ◽  
...  
Keyword(s):  
Confidence Interval ◽  
Hip Replacement ◽  
National Registry ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Large Head ◽  
Metal On Metal ◽  
Hip Replacements ◽  
Hip Arthroplasties

The purpose of this paper is to determine the prevalence of metal-on-metal (MoM) total hip replacement (THR) in European registries, to assess the incidence of revision surgery and to describe the national follow-up guidelines for patients with MoM THR including resurfacings. Eleven registries of the Network of Orthopaedic Registries of Europe (NORE) participated totalling 54 434 resurfacings and 58 498 large stemmed MoM THRs. The resurfacings and stemmed large head MoM had higher pooled revision rates at five years than the standard total hip arthroplasties (THA): 6.0%, 95% confidence interval (CI) 5.3 to 6.8 for resurfacings; 6.9%, 95% CI 4.4 to 9.4 for stemmed large head MoM; and 3.0%, 95% CI 2.5 to 3.6 for conventional THA. The resurfacings and stemmed large head MoM had higher pooled revision rates at ten years than the standard THAs: 12.1%, 95% CI 11.0 to 13.3 for resurfacings; 15.5%, 95% CI 9.0 to 22 for stemmed large head MoM; and 5.1%, 95% CI 3.8 to 6.4 for conventional THA. Although every national registry reports slightly different protocols for follow-up, these mostly consist of annual assessments of cobalt and chromium levels in blood and MRI (MARS) imaging. Cite this article: EFORT Open Rev 2019;4 DOI: 10.1302/2058-5241.4.180078

scholarly journals The Performance of Mixed Manufacturer Metal On Metal Total Hip Replacements

2017 ◽  
Vol 7 (2) ◽  
Author(s):  
Richard Barker Cook ◽  
Jeremy M. Latham ◽  
Robert J.K. Wood
Keyword(s):  
Femoral Head ◽  
Hip Resurfacing ◽  
Normal Range ◽  
Material Loss ◽  
Total Hip ◽  
Loss Analysis ◽  
Total Hip Replacements ◽  
Metal On Metal ◽  
Hip Replacements ◽  
Stem Damage

Using a femoral head from one manufacturer on the stem of another manufacturer poses the risk that the taper interface between the components may not contact correctly and the performance of the joint will be impaired. The cohorts in this study are a combination of modular Birmingham Hip Resurfacing (BHR) and Adept femoral heads on CPT stems. The study reviews the geometry of the taper interfaces to establish if the taper clearance angles was outside of the normal range for other taper interfaces. In addition the rates of material loss from the bearings and taper and a ranking of the stem damage were reviewed to determine if the levels of loss were above that seen for other similar joints. The material loss analysis demonstrated that the rates or levels of loss from the bearings, taper and stem were no different to levels published for manufacturer matched joints and in many cases were lower. The results demonstrate that the taper clearance angles for the mixed manufacturer joints (BHR-CPT: 0.067 to -0.116, Adept-CPT: 0.101 to -0.056) were within the range of other studies and manufacturer matched clearances (0.134 to -0.149).Using components from different manufacturers has not in this instance increased the level of material loss from the joints, when compared to other similar manufacturer matched joints.

CT-based quantification of bone stock in large head metal-on-metal unilateral total hip replacements

2016 ◽  
Vol 85 (4) ◽  
pp. 760-763 ◽  
Author(s):  
Martijn F. Boomsma ◽  
Inge Slouwerhof ◽  
Christiaan van Lingen ◽  
Dean F.M. Pakvis ◽  
Jorn A. van Dalen ◽  
...  
Keyword(s):  
Bone Stock ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Large Head ◽  
Metal On Metal ◽  
Hip Replacements

SURVIVORSHIP AND RETRIEVAL ANALYSIS OF SIKOMET METAL-ON-METAL TOTAL HIP REPLACEMENTS AT A MEAN OF SEVEN YEARS

2006 ◽  
Vol 88 (6) ◽  
pp. 1173-1182 ◽  
Author(s):  
INGRID MILOŠEV ◽  
RIHARD TREBŠE ◽  
SIMON KOVAČ ◽  
ANDREJ CÖR ◽  
VENČESLAV PIŠOT
Keyword(s):  
Total Hip ◽  
Retrieval Analysis ◽  
Total Hip Replacements ◽  
Metal On Metal ◽  
Hip Replacements

scholarly journals Granulation Tissue in Metal on Metal Total Hip Replacements: A Pathological Study.

1998 ◽  
Vol 47 (1) ◽  
pp. 151-154
Author(s):  
Koji Hiraoka ◽  
Fujio Higuchi ◽  
Rikimaru Kawabata ◽  
Akio Inoue
Keyword(s):  
Granulation Tissue ◽  
Pathological Study ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Metal On Metal ◽  
Hip Replacements

Quantification of self-polishing in vivo from explanted metal-on-metal total hip replacements

2011 ◽  
Vol 44 (5) ◽  
pp. 513-516 ◽  
Author(s):  
Thomas J. Joyce ◽  
Harry Grigg ◽  
David J. Langton ◽  
Antoni V.F. Nargol
Keyword(s):  
Total Hip ◽  
Total Hip Replacements ◽  
Metal On Metal ◽  
Hip Replacements

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.

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