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Metal On Metal Bearings
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Book Synopsis Metal-on-Metal Bearings by : Lynne C. Jones
Download or read book Metal-on-Metal Bearings written by Lynne C. Jones and published by Springer Science & Business Media. This book was released on 2013-10-29 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Metal-on-Metal and Other Bearing Trends Among Fellows of the AAOS by : Kenneth L. Urish
Download or read book Metal-on-Metal and Other Bearing Trends Among Fellows of the AAOS written by Kenneth L. Urish and published by . This book was released on 2013 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Prevalence of Metal-on-Metal Bearings in the United States by : Kevin L. Ong
Download or read book Prevalence of Metal-on-Metal Bearings in the United States written by Kevin L. Ong and published by . This book was released on 2013 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Wear and Lubrication of Metal-metal Bearings for Total Hip Arthroplasty by :
Download or read book Wear and Lubrication of Metal-metal Bearings for Total Hip Arthroplasty written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bearings and Bearing Metals by : Machinery Publishing Company
Download or read book Bearings and Bearing Metals written by Machinery Publishing Company and published by . This book was released on 1921 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 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 by :
Download or read book 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 published by . This book was released on 1962 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bearings And Bearing Metals by : Anon
Download or read book Bearings And Bearing Metals written by Anon and published by Read Books Ltd. This book was released on 2013-04-16 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Few subjects related to the design or construction of machinery are of greater importance than the subject of bearings. All classes of mechanisms have bearings of some kind and bearings that are properly designed and constructed are a necessity. As every experienced mechanic knows, a poor bearing may tie up a machine or even cause an entire plant to shut down temporarily. Owing to the importance of this subject, designers and mechanics in general should understand the fundamental principles governing bearing design and should know what approved types are in common use on different classes of machinery. This treatise deals exclusively with plain bearings, ball and roller bearings being covered in another book of this series. The types of plain bearings illustrated in a connection with the following chapters were selected to show how designs are modified to suit different conditions, and also practical methods of arranging bearings to insure adequate lubrication and thorough protection against the entrance of any foreign material liable to injure the bearing surfaces. The designs illustrated were taken from actual practice and have proved satisfactory when properly constructed and applied. This treatise contains, in addition to the features mentioned, condensed information on corn- positions of various bearing metals, their properties, the classes of service to which different bearing alloys are adapted, and the general methods of procedure in designing plain bearings to meet different service conditions.
Download or read book Bearing Metals written by Richard Ruedy and published by . This book was released on 1942 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Total Hip Arthroplasty by : Karl Knahr
Download or read book Total Hip Arthroplasty written by Karl Knahr and published by Springer Science & Business Media. This book was released on 2012-04-05 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the 2011 EFORT Congress in Copenhagen, many interesting topics relating to tribology in total hip arthroplasty were discussed during a special day devoted entirely to the subject. EFORT decided that, given the wide interest in these discussions, publication of the presentations would be warmly welcomed by all fellow professionals who were unable to attend. This book is the result. It provides detailed information on currently used articulating materials and their wear performance. Clinical outcomes are discussed, and important new frontiers are carefully considered. The book will be of interest both to novices who want to learn more about the field and to experienced orthopaedic surgeons wishing to keep abreast of the latest developments.
Author :Frankie W. (Frankie Waisen) Chan Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 : Total Pages :418 pages Book Rating :4.:/5 (428 download)
Book Synopsis Wear and Lubrication of Metal-metal Bearings for Total Hip Arthroplasty [microform] by : Frankie W. (Frankie Waisen) Chan
Download or read book Wear and Lubrication of Metal-metal Bearings for Total Hip Arthroplasty [microform] written by Frankie W. (Frankie Waisen) Chan and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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." --
Book Synopsis Complications of Total Hip Arthroplasty by : Richard H. Rothman
Download or read book Complications of Total Hip Arthroplasty written by Richard H. Rothman and published by W.B. Saunders Company. This book was released on 1988 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Accelerated Life Testing of Porous Metal Bearings by : Stephen Joseph Peterson
Download or read book Accelerated Life Testing of Porous Metal Bearings written by Stephen Joseph Peterson and published by . This book was released on 1975 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bearings written by M. J. Neale and published by Elsevier. This book was released on 2013-10-22 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bearings: A Tribology Handbook is a practical guide on bearings, based on materials published in the first edition of the Tribology Handbook. The handbook has been updated matching international requirements. The book is divided in four main parts. The first part is a description of different bearing types and forms pertaining to continuous and oscillatory movements. A selection of journal and thrust bearings as to their different load capacity, performance, and special environmental conditions is explained. The second part deals with the physical properties and load capacity of plain bearings. Other kinds of bearing, such as the dry rubbing bearings; porous metal bearings; grease, wick, and drip fed journal bearings; ring and disc fed journal bearings; steady load pressure fed journal bearings; high-speed bearings; and crankshaft bearings, are considered regarding their performance, maintenance, and suitability to specific conditions. The third part focuses on one type of bearing: the rolling bearing. The selection, composition, shaft and housing design, and fitting and mounting for this type is discussed. The last part explains special bearing types such as slide bearings, instrument jewels (which are a combination of a steel pivot and a synthetic sapphire jewel), and electromagnetic bearings that are essentially powerful electromagnets. The need for surface treatments and coatings is then explained for optimum usage. The handbook is useful for design engineers, mechanical engineers, and material researchers. Mechanical, aeronautical, and automotive students; car mechanics; and those interested in machine and car maintenance will find this handbook a handy reference.
Book Synopsis Theoretical and Experimental Analyses of Porous Metal Bearings by : Cristino Cusano
Download or read book Theoretical and Experimental Analyses of Porous Metal Bearings written by Cristino Cusano and published by . This book was released on 1970 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of a Machine for the Experimental Investigation of Porous Metal Bearings by : Cristino Cusano
Download or read book Design of a Machine for the Experimental Investigation of Porous Metal Bearings written by Cristino Cusano and published by . This book was released on 1967 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bioceramics and Alternative Bearings in Joint Arthroplasty by : James A. D'Antonio
Download or read book Bioceramics and Alternative Bearings in Joint Arthroplasty written by James A. D'Antonio and published by Springer Science & Business Media. This book was released on 2006-03-10 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dear Colleague and Participant in Bioceramics and Alternative Bearings In Joint Arthroplasty: 10*" International BIOLOX® Symposium We are once again very proud that we are able to present to you the proceedings of the Symposiunn as part of your registration materials. This group accomplishment has been made possible by the superb cooperation received from the speakers in sending us their manuscripts on a timely basis as well as by the supporting staff at both CeramTec and at the Publishing House in executing all of the details needed. We specially extend our most heartfelt thanks to the Scientific Committee for their assistance in evaluating and selecting the submissions as well as developing the Symposium program. We are more convinced than ever that the proceedings of this Symposium are a continuation of CeramTec's tradition of providing all members of the orthopedic surgical community with a valuable addition to your reference libraries. We hope that this book will present you with the latest and most up to date source of scientific and clinical information regarding the use of ceramics and other alternative bearings in joint replacement surgery.
Download or read book White Metal Bearings written by and published by . This book was released on 1934 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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