Metal On Metal Bearings

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Metal On Metal Bearings

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Author : Lynne C. Jones
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-29

Metal On Metal Bearings written by Lynne C. Jones and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-29 with Technology & Engineering categories.

This book addresses the background and significance of the factors potentially influencing the clinical and biological outcomes of metal-on-metal hip implants. Metal-on-metal bearings were introduced and evaluated as an alternative to other bearing couples, particularly metal-on-polyethylene, due to their enhanced wear resistance as determined in laboratory testing. Initially, reports of short-term clinical outcomes were favorable and an increasing number of metal-on-metal prostheses were implanted. Subsequently, isolated case findings describing adverse tissue responses around the articulation became the harbinger of an increasing number of reports describing pseudotumors and other significant lymphocytic-based responses associated with metal-on-metal prostheses. Questions have been raised as to whether this is an implant, design, or patient-specific response. The reasons why some patients have a negative biological response and pathology while others do not remain to be determined, but tens of thousands of patients in the US, the UK, and around the world are considered to be at risk. Leading researchers and clinicians describe the issues related to the nature of the biological and pathological responses and the protocols that should be followed to determine if an adverse response is occurring. This book is essential reading for researchers, engineers, and orthopaedic surgeons who are involved in the design, evaluation, and implantation of metal-on-metal prostheses.

Metal On Metal And Other Bearing Trends Among Fellows Of The Aaos

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Author : Kenneth L. Urish
language : en
Publisher:
Release Date : 2013

Metal On Metal And Other Bearing Trends Among Fellows Of The Aaos written by Kenneth L. Urish and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Bearing surface categories.

To determine what the trends for the use of total hip arthroplasty bearings have been in the United States and how the Food and Drug Administration (FDA) warning on the use of metal on metal bearings have affected surgeon's decisions concerning their use, a survey was performed on the fellows of the American Academy of Orthopaedic Surgeons (AAOS). Two thousand randomly selected practicing fellows were invited to take part in the AAOS 2010 survey. Of those invited, 170 (8.5 % response rate) completed the survey. Confidence interval (CI) values at 95 % were provided for each survey item. There were no significant differences between invitees and respondents in terms of practice setting and gender. The majority of respondents (79.2 %) match their patients' function/activity to the bearing surface used in total hip arthroplasty (THA). Respondents mostly use peer reviewed publications (92.9 %), and personal experience (81.7 %) when making a decision on bearing use in THA. Almost 80 % of the respondents indicated that their hospitals do not limit their choice of implants. Cross-linked polyethylene has been the most used type of bearing surface before 2010 (74.80 %) and currently (78.62 %). Metal-on-metal and ceramic-on-ceramic use decreased; however, there are no significant differences between the uses of all types of bearings before 2010 and currently. Given the current debated issues, 75.6 % of respondents are less likely to use metal-on-metal bearing in the future; 22 % are not affected. The majority of respondents (70.3 %) indicated that ceramic-on-ceramic bearing have fewer wear particles. More than half (56.7 %) indicated that metal-on-metal (MoM) has the longest survivorship. This survey indicated that surgeons responded that their use of MoM bearings will likely decrease in the future but the numbers in this survey show no significant difference in their use before and after the FDA warning for MoM bearings. The survey does show that most surgeons believe that they will have less choice as directed by their hospital or insurance companies in their bearing use in the near future due to health economics and the efforts to decrease cost. Only time will tell if surgeons who indicate the use of MoM will decrease over time actually comes to fruition or if the use of MoM will continue at its current rate. This survey indicates that although the trend shows a decrease in their use, it was not statistically significant.

Wear And Lubrication Of Metal Metal Bearings For Total Hip Arthroplasty

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Author :
language : en
Publisher:
Release Date : 1999

Wear And Lubrication Of Metal Metal Bearings For Total Hip Arthroplasty written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

Prevalence Of Metal On Metal Bearings In The United States

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Author : Kevin L. Ong
language : en
Publisher:
Release Date : 2013

Prevalence Of Metal On Metal Bearings In The United States written by Kevin L. Ong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Epidemiology categories.

The purpose of this study was to describe actual usage patterns for metal-on-metal (MOM) bearings in the United States using a nationally representative database. The 2005-2009 nationwide inpatient sample (NIS), in combination with the 2009-2010 state inpatient databases (SIDs), was employed to identify primary total hip arthroplasty (THA), revision THA, and resurfacing hip arthroplasty (RHA) patients implanted with a MOM bearing using ICD-9-CM codes. The MOM patient population was characterized by gender, age, race, U.S. Census region, hospital characteristics, and insurance coverage. The prevalence of MOM bearing usage was estimated between 2000 and 2010. Between 2005 and 2010, MOM bearing usage in the United States ranged between from 32 % and 40 % of primary THAs and from 26 % and 32 % of revision THAs. Utilization of MOM bearing types in primary/revision THA and RHA peaked in 2008. By 2010, 755 000 patients were estimated to be implanted with MOM bearings in the United States between 2000 and 2010, we estimated that 83.7 % of MOM bearings in the United States were implanted during primary THA procedures, 11.7 % during revision THA, and the remaining 4.6 % during RHA. Our research demonstrates that the prevalence of MOM increased substantially up to a high water mark in 2008. Despite uncertain indications for use, MOM bearings were used extensively in female and elderly patients.

Proceeding Of The Panel Discussion On Liquid Metal Bearings Held Under The Auspices Of The Mechanical Working Group Interagency Advanced Power Group 9 October 1962 At The Power Information Center University Of Pennsylvania Philadelphia Pa

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Author :
language : en
Publisher:
Release Date : 1962

Proceeding Of The Panel Discussion On Liquid Metal Bearings Held Under The Auspices Of The Mechanical Working Group Interagency Advanced Power Group 9 October 1962 At The Power Information Center University Of Pennsylvania Philadelphia Pa written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Bearings categories.

Wear And Lubrication Of Metal Metal Bearings For Total Hip Arthroplasty Microform

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Author : Frankie W. (Frankie Waisen) Chan
language : en
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Release Date : 1998

Wear And Lubrication Of Metal Metal Bearings For Total Hip Arthroplasty Microform written by Frankie W. (Frankie Waisen) Chan and has been published by National Library of Canada = Bibliothèque nationale du Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

"A major current concern in total hip arthroplasty is the generation of polyethylene wear particles at the articulating surfaces and resulting macrophage-mediated, periimplant osteolysis. There has been revived interest in metal-metal bearings for hip implants because of their potential for improved wear performance. Cobalt chromium molybdenum metal-metal hip implants of two materials (alloy types) and two carbon content levels were custom-manufactured and tested in a hip simulator under various loading conditions. In general, accelerated wear occurred within the first million cycles of testing followed by a decrease in wear rate to low steady-state values. The volumetric wear at three million cycles was up to several orders of magnitude less than the wear of conventional metal-polyethylene hip implants. Increased head-cup clearance and surface roughness resulted in increased wear. Independent effects on wear of material and carbon content were not identified. The low wear may be related to fluid film lubrication at the bearing surfaces. A time-varying elastohydrodynamic lubrication model was developed to predict fluid film thickness for the experimental metal-metal hip implants during simulator testing. Decreased clearance, increased lubricant viscosity, and increased cycle frequency resulted in increased film thickness. A strong independent effect on film thickness of load magnitude was not found. The lambda ratio (of film thickness to combined surface roughness) was used to indicate the extent of fluid film lubrication. For the experimental implants, total wear decreased with increasing lambda ratio. These studies provided important new information on the design and testing parameters that control wear performance and lubrication of metal-metal bearings for hip implants." --

Bearing Metals

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Author : Richard Ruedy
language : en
Publisher:
Release Date : 1942

Bearing Metals written by Richard Ruedy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1942 with Alloys categories.

Design Of A Machine For The Experimental Investigation Of Porous Metal Bearings

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Author : Cristino Cusano
language : en
Publisher:
Release Date : 1967

Design Of A Machine For The Experimental Investigation Of Porous Metal Bearings written by Cristino Cusano and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Bearings (Machinery) categories.

Optical Analysis Of Porous Metal Bearings

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Author : K. M. Yung
language : en
Publisher:
Release Date : 1978

Optical Analysis Of Porous Metal Bearings written by K. M. Yung and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.

Collected Papers And Scrapbooks On Babbit Metal Bearings And Lubrication

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Author : Louis D. Allen
language : en
Publisher:
Release Date : 1910

Collected Papers And Scrapbooks On Babbit Metal Bearings And Lubrication written by Louis D. Allen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1910 with categories.