Download or read book Mobility and Contact Mechanics of a Rotating Platform Total Knee Replacement written by Jason K. Otto and published by . This book was released on 2012 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite their increasing clinical usage, mobile-bearing total knee replacements have not been well characterized biomechanically. An experimental and finite element analysis was done to asses the mobility and contact mechanics of a widely used rotating platform total knee replacement. Parameters that varied were axial load, condylar load allocation, flexion angle, and static versus dynamic loading. Similar results from the physical model and finite element model lend credence to the validity of the findings. The torque required to initiate rotation (static torque) was greater than that to sustain rotation (dynamic torque). At four times body weight axial load, peak resisting torque measured was 9.47 ± 0.61 and 5.51 ± 0.38 N-m, for static and dynamic torque, respectively. A 60-40 condylar load allocation produced slightly less resisting torque than the 50-50 load. For all practical purposes, the polyethylene insert rotated simultaneously with the femoral component, leading to maintenance of high contact area, desirable behavior clinically. Walking cycle simulations produced a total axial rotation range of motion of 6°. The high frictional torques observed at the mobile interface may explain why a percentage of these mobile-bearings fail to rotate under routine functional load.
Download or read book Mobility and Contact Mechanics of Rotating Platform Total Knee Replacements written by Jason Karl Otto and published by . This book was released on 2001 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Total Knee Replacement Trends written by Marya and published by Elsevier India. This book was released on 2009 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the Dynamic Tibiofemoral Contact Mechanics in a Total Knee Replacement written by Lisa Marie Gustafson and published by . This book was released on 2004 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Revision Total Knee Arthroplasty written by James V. Bono and published by Springer Nature. This book was released on with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LCS Mobile Bearing Knee Arthroplasty written by Karel J. Hamelynck and published by Springer. This book was released on 2002-10-04 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Worldwide experience with the Lcs• mobile bearing total knee prosthesis has been unpar alleled both in terms of enduring popularity and outstanding long-term clinical results. Buechel and Pappas's design was based on the principles of; restoring anatomical joint function to as near normal as possible, minimising contact stresses to avoid wear and darn age to the bearing surfaces. and finally the idea that constraint should refiect the need for mobility, to avoid shear stresses and loosening of the implant. In 1977, the LCS® knee was implanted by Dr. Frederick Buechel. This was the first mobile bearing, tri-compartmental knee implant. This was also the first to successfully address the key issues ofloosening, wear and patello-femoral problems associated with earlier designs. The unique design solution was the creation of a common articulating geometry for the tibia and patella on the distal femoral surface. This resulted in a tibial and patellar articulation that was mobile in nature, but with an identical radius of curvature and conformity. The mobile bearing concept was considered sufficiently novel and unproven that the US FDA (Food & Drug Administration) required that it be validated in an Investigational Device Evaluation (IDE). An FDA IDE study involving 25 US surgeons was initiated in 1981. Validation of the clinical success of the device in this study resulted in FDA approval of the LCS, Knee (for cemented, tri-compartmental use) in 1985.
Download or read book Principles of Human Joint Replacement written by Frederick F. Buechel and published by Springer Science & Business Media. This book was released on 2011-11-09 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drs. Buechel, an orthopaedic surgeon, and Pappas, a professor of Mechanical Engineering, are the designers of several successful joint replacement systems. The most well-known of these is the pioneering LCS knee replacement. They have written this book for the users and designers of joint replacements. It is an attempt to convey to the reader the knowledge accumulated by the authors during their thirty five year effort on the development of replacement devices for the lower limb for the purpose of aiding the reader in their design and evaluation of joint replacement devices. The early chapters describe the engineering, scientific and medical principles needed for replacement joint evaluation. One must understand the nature and performance of the materials involved and their characteristics in vivo, i.e. the response of the body to implant materials. It is also essential to understand the response of the implants to applied loading and motion, particularly in the hostile physiological environment. A chapter describes the design methodology now required for joint replacement in the USA and EU countries. The remaining chapters provide a history of joint replacement, an evaluation of earlier and current devices and description of the design rationale for some of the authors devices with which the authors are, of course, quite familiar.
Download or read book Total Knee Replacement written by A. A. Savastano and published by . This book was released on 1980 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LCS Mobile Bearing Knee Arthroplasty written by Karel J. Hamelynck and published by Springer. This book was released on 2014-08-23 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: Worldwide experience with the Lcs• mobile bearing total knee prosthesis has been unpar alleled both in terms of enduring popularity and outstanding long-term clinical results. Buechel and Pappas's design was based on the principles of; restoring anatomical joint function to as near normal as possible, minimising contact stresses to avoid wear and darn age to the bearing surfaces. and finally the idea that constraint should refiect the need for mobility, to avoid shear stresses and loosening of the implant. In 1977, the LCS® knee was implanted by Dr. Frederick Buechel. This was the first mobile bearing, tri-compartmental knee implant. This was also the first to successfully address the key issues ofloosening, wear and patello-femoral problems associated with earlier designs. The unique design solution was the creation of a common articulating geometry for the tibia and patella on the distal femoral surface. This resulted in a tibial and patellar articulation that was mobile in nature, but with an identical radius of curvature and conformity. The mobile bearing concept was considered sufficiently novel and unproven that the US FDA (Food & Drug Administration) required that it be validated in an Investigational Device Evaluation (IDE). An FDA IDE study involving 25 US surgeons was initiated in 1981. Validation of the clinical success of the device in this study resulted in FDA approval of the LCS, Knee (for cemented, tri-compartmental use) in 1985.
Download or read book Primary Total Knee Arthroplasty written by Alessandro Rozim Zorzi and published by BoD – Books on Demand. This book was released on 2018-05-23 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a compilation of topics related to primary total knee arthroplasty. The chapters cover, in a clear and didactic way, the current themes, written by experts from the area, from different parts of the world. Topics related to the three surgical phases (before surgery, during surgery, and after surgery) are discussed here. This is very important because the surgeon is not a "factory worker." First of all, it is a medicine doctor who has to feel and understand the particularities of each patient. Demographic studies show an aging population. Osteoarthritis and inflammatory diseases are becoming much more prevalent. In addition, a worldwide epidemic of trauma has led to the need for arthroplasties much more frequently. Therefore, total knee arthroplasty will be an increasingly important subject.
Download or read book Total Knee Replacement written by Shigeo Niwa and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Back in September of 1974, I acquired much valuable information while attending the International Conference on Total Knee Replacement in London, which was organized by The Medical Engineering Working Party and the Tribology Group of the Institution of Mechanical Engineers, and the British Orthopaedic Association. I was greatly inspired by the conference, and it formed the beginning of my studies on total knee replacement. The co-editors of this proceedings, Prof. J. Paul and Dr. S. Yamamoto, are both acquaintances made originally at that conference. The International Symposium on Total Knee Replacement held in Nagoya, Japan, on 18-19 May 1987 was attended by many participants, including Prof. Walker, who had presented his studies earlier in London. During the past decade and a half, remarkable technical progress has been made in total knee prostheses. In this symposium, cemented total knee replacement (TKR), noncemented TKR, design considerations of total knee prostheses, problems concerning the patello femoral joint, and the newly developed total knee prosthesis were the main topics discussed. I believe that much new information, including that about the challenges which still remain, along with a fresh view towards continuing studies, are presented here for the reader. I would like to express my sincere gratitude to the support of the Knee Joint Research Society in Japan and to the participants in the symposium for their great help in publishing this book.
Download or read book Total Knee Arthroplasty written by David S. Hungerford and published by . This book was released on 1984 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Joint Replacement Technology written by Peter A. Revell and published by Elsevier. This book was released on 2008-07-09 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Joint replacement has been one of the major successes of modern medicine. Its continued success depends on effective collaboration between clinicians and researchers across many different areas in science and medicine. This important book brings together the wide range of research in this area and its implications for clinical practice.The book sets the scene with introductory chapters on joint biomechanics and tribology, materials for joint replacement and their interactions with the body, and regulatory issues. Part two reviews the use of metals and ceramics as joint replacement materials, joint design, bone cements and cementless fixation techniques, failure mechanisms and ways of predicting the lifetime of replacement joints. The third part of the book summarises research on how prosthetic joints interact with the body, including biological causes of joint failure, sterilisation techniques and the use of drug delivery systems to enhance joint replacement. The final group of chapters reviews key issues in replacing particular joints including the hip, knee, ankle, shoulder and elbow as well as developments in intervertebral disc and tempero-mandibular joint replacement technology.With its distinguished editor and international team of contributors, Joint replacement technology is a standard reference for the engineering and materials scientific communities, as well as surgeons seeking the best treatment for their patients. Reviews joint biomechanics and tribology Considers the use of metals and ceramics as joint replacement materials, joint design and bone cements Summarises research on prosthetic interaction with the body
Download or read book Insall Scott Surgery of the Knee E Book written by W. Norman Scott and published by Elsevier Health Sciences. This book was released on 2017-02-10 with total page 2758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Insall & Scott Surgery of the Knee by Dr. W. Norman Scott remains the definitive choice for guidance on the most effective approaches for the diagnosis and management of the entire scope of knee disorders. This edition reflects a complete content overhaul, with more than 50 new chapters and over 400 contributors from around the world. The video program includes 70 new video clips, while new and expanded material covers a range of hot topics, including same-day surgery and hospital management of knee arthroplasty patients and anesthesia specific for knee surgery. Extensive visual elements and video program include nearly 70 new videos -- over 230 in total – as well as a Glossary of Implants featuring 160 demonstrative pictures. Over 50 new chapters and brand-new sections on Same Day Surgery and Hospital Management of Knee Arthroplasty Patients; Quality and Payment Paradigms for TKA; Anesthesia Specific for Knee Surgery; and Preoperative Assessment, Perioperative Management, and Postoperative Pain Control. An expanded Adult Reconstruction Section informs readers about Enhanced Primary Revision and the treatment of Peri-prosthetic fractures in TKA. Includes enhanced worldwide approaches for all aspects of disorders of the knee from nearly 400 contributors worldwide. Boasts updated pediatric knee considerations and updated tumor surgery principles for the treatment of tumors about the knee. Expert Consult eBook version included with purchase. This enhanced eBook experience allows you to search all of the text, figures, images, videos (including video updates), glossary, and references from the book on a variety of devices.
Download or read book On the Fundamentals of Rotating Platform Total Knee Arthroplasty written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Development of a Computational Model to Predict the in Vivo Contact Mechanics of Modern Total Knee Arthroplasty written by Adrija Sharma and published by . This book was released on 2008 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the development of a computationally efficient and fast method that incorporates the kinematics obtained from fluoroscopy and extends it to the prediction of the in-vivo contact mechanics at the femoro-tibial articulation in modern knee implants for the deep knee bend activity. In this endeavor, this dissertation deals with the use of an inverse dynamic rigid body model characterizing the slip and roll behavior observed in the femoro-polyethylene articulation and a coupled deformation model where the polyethylene in knee implants are modeled as hexahedral discrete element networks. The performance of this method is tested by comparing force predictions from a telemetric knee and finite element analysis. Finally, the method is applied to study the in vivo contact mechanics and mechanics of the quadriceps mechanism in six popular knee designs. During the deep knee bend activity, the contact force generally increased with flexion. However, the medial lateral forces were not equally distributed and the medial lateral force distribution generally varied from 60%- 40% at full extension to as high as 75%-25% at full flexion in some patients. Also, the magnitude of axial force in the superior-inferior direction was the highest and was found to contribute around 98%-99% of the total load acting at the femorotibial joint. The forces in the medio-lateral and antero-posterior directions were low and the maximum magnitude observed was around 0.5BW. The contact areas and contact pressures were much more sensitive to the geometries involved and the in vivo kinematics. Though no definite pattern was observed for the variation of the contact areas throughout flexion, the contact pressures increased in both condyles with increasing flexion. Also, the contact pressures on the medial condyle were higher than the contact pressures observed in the lateral condyle. The patellofemoral and the quadriceps force ratio increased with the increase in flexion while the patellar ligament and the quadriceps force ratio decreased with increasing flexion. In some patients at high flexion, the quadriceps force and as a result the patellofemoral, patellar ligament and the knee contact forces were found to decrease due to the wrapping of the quadriceps coupled with posterior movement of the femoral condyles leading to the increase in the quadriceps moment arm.
Download or read book Rotating platform Knees written by and published by . This book was released on 2005 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
