Download or read book Effect of Press Fit on Lateral Stem Stresses and the Integrity of Porous Coated Femoral Prostheses written by M. Bushelow and published by . This book was released on 1987 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A strain gage analysis was performed to determine the stresses generated on the lateral surface of two types of porous-coated femoral prostheses. One type of prosthesis was made of wrought titanium (Ti-6Al-4V) alloy with a porous polysulfone coating; the other was a porous-coated alloy meeting the requirements of the ASTM Specification for Cast Cobalt-Chromium-Molybdenum Alloy for Surgical Implant Applications (F 75-82). Various degrees of fit were evaluated, ranging from a loose fit to one in which the stem was cemented into the femoral canal. The results showed that modeling pressfit porous-coated stems using cemented conditions can produce peak stresses on the lateral surface of the stem significantly lower than those for noncemented stems. Based on the fatigue strength of the stem material, the authors show that assessing stem integrity with the assumption that the cemented stem represents a complete bone ingrowth condition may lead to a design evaluation of the femoral stem that is overoptimistic for in vivo fatigue load conditions.
Download or read book Quantitative Characterization and Performance of Porous Implants for Hard Tissue Applications written by Jack E. Lemons and published by ASTM International. This book was released on 1987 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1989 with total page 1440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Principles Design and Safety of Joint Implants written by G. Buchhorn and published by Seattle ; Toronto : Hogrefe & Huber. This book was released on 1994 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of the state-of-the-art on factors decisive for the safety and long-term function of total joint replacements, in papers from the third Biomaterials Symposium, held in 1987 at the U. of Gottingen, Germany. The volume is divided into sections on requirements on implant security; strength of the biomaterials; tribology of various couplings; shape and dimensions; corrosion and degradation; implant anchorage; bone reaction and bioactivity; custom made implants; manufacturing and quality control; instruments and implant retrieval; clinical experiences, carcinogenicity, and other aspects. For clinicians and researchers from many fields interested in joint replacement. Annotation copyright by Book News, Inc., Portland, OR
Download or read book Implant Materials in Biofunction written by Cornelis de Putter and published by Elsevier Publishing Company. This book was released on 1988 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strain Analysis of the Proximal Femur After Total Hip Replacement written by DS. Hungerford and published by . This book was released on 1987 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strain analysis of human cadaver femora after cemented total hip arthroplasty (THA) has demonstrated a reduction in stress transfer along the proximal femur. The principal objective of this study was to determine the effect of the cementless application of a pressfit, porous-coated prosthesis on the strain experienced by the proximal femur. Using the photoelastic coating technique (PECT), five human cadaver specimens were subjected to strain analysis before and after cementless arthroplasty with a PCA total hip prosthesis. After total hip replacement, the strain magnitudes were reduced for all points along the medial border when the femur was subjected to loading conditions. A reduction of the level of strain experienced by the calcar ranged from 34.7 to 43.7% under loads ranging from 750 to 2000 N--a considerably smaller reduction than that reported by previous investigators. The region of the greater trochanter was the only area of the lateral surface to demonstrate an increase in strain magnitude after THA; the other, more distal points laterally experienced a reduced level of strain. Increases in strain magnitude, although not statistically significant, were detected along the anterior aspect of the femora. Significant decreases in strain were observed at the two more distal points posteriorly, with no significant change proximally. As this investigation is an evaluation only of the immediate effect of the design of the prosthesis in achieving a press fit, and the specimens are without the benefit of bony ingrowth, additional studies are necessary to determine the effect of biologic ingrowth on the distribution of strain within the proximal femur.
Download or read book Alloys Index written by and published by . This book was released on 1989 with total page 1228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1990 with total page 1246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Cross sectional Geometry of Fixation Stems on Stresses in Bone implant Systems written by Stephen Girard Desormeaux and published by . This book was released on 1976 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Porous Polysulfone Coated Femoral Stems written by NB. Beals and published by . This book was released on 1987 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concerns about the metal ion release, high stiffness, and reduction in stem strength that are associated with porous metal coatings have prompted investigations of a relatively high-strength porous polymeric coating, porous polysulfone (PPSF). The present study was initiated in order to characterize the mechanical properties of PPSF and PPSF-coated titanium alloy and to evaluate the performance of PPSF as a coating on titanium alloy femoral stems in dogs. PPSF with various porosities was fabricated by sintering particles of Union Carbide P-1700 medical-grade polysulfone. Chemical coupling of PPSF to Ti-6Al-4V alloy specimens was achieved using silyl-reactive polysulfone. The shear strength of the PPSF/titanium alloy interface determined from push-out tests on coated cylindrical rods and transverse sections of the coated canine femoral stems was found to exceed 16 MPa. Tension and punch shear tests performed on the PPSF yielded values of 13 and 21 MPa, respectively. The relationship between strength and porosity characteristics was determined. Fatigue tests performed on PPSF-coated titanium femoral stems revealed no failure of the coating up to 1 million cycles. No difference between PPSF-coated and uncoated titanium specimens was found in the fatigue behavior. PPSF-coated titanium alloy canine femoral stems (32% porosity, 246 μm in average pore size) were implanted in 25 dogs. Evidence of loosening was found only in those animals in which the canal/fill ratio was low. No gross radiographic changes were found in the implanted femurs within the two-year postoperative period. Histology showed bone ingrowth fixation of the prostheses. Results of this investigation indicate that PPSF-coated femoral stems warrant continued investigation.
Download or read book Asymmetric Stress Analysis of an Axisymmetric Porous Coated Femoral Head Prosthesis System written by Jack L. Linder and published by . This book was released on 1978 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Postgraduate Orthopaedics written by Paul A. Banaszkiewicz and published by Cambridge University Press. This book was released on 2012-08-16 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The must-have book for candidates preparing for the oral component of the FRCS (Tr and Orth).
Download or read book A Manual of Orthopaedic Terminology E Book written by Fred R. T. Nelson and published by Elsevier Health Sciences. This book was released on 2021-11-03 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now completely updated regarding the latest procedures, materials, devices, classification systems, and technologies, A Manual of Orthopaedic Terminology, 9th Edition, is an invaluable reference for anyone who needs access to the most up-to-date terms, acronyms, and codes related to clinical orthopaedics and research. This portable guide allows for quick searches both in print and online, categorizing and cross-referencing terms so that those unfamiliar with orthopaedics can locate a term in its proper context. Unlike a traditional A-Z dictionary format, terms are organized by topic?facilitating faster search results with related terms appearing on the same or immediately adjacent page. - Contains extensive updates from cover to cover, including new terminology and acronyms in all areas of clinical orthopaedics and research. - Organizes information by topic, helping you find related information quickly and easily. - Presents basic science terms as they relate to clinically relevant issues, and clarifies terms used in injury and insurance claims with immediately neighboring relative terms. - Features an extensive index, an appendix of ICD codes, clear writing and full-color illustrations, an appendix of acronyms, and tables clarifying disease processes—all designed to make information understandable and easily accessible to both the lay reader and the health care professional. - Helps you stay abreast of the latest terminology with new terms provided by contributors who are orthopaedic researchers from across the country and whose expertise provides current information on terminology and procedures. - Ideal for anyone needing a working knowledge of orthopaedic terminology—from the transcriptionist, insurance adjuster, or medical device salesperson to surgeons, radiologists, medical students, and those in physical and occupational therapy, operating rooms, general medicine, massage therapy, and much more. - Enhanced eBook version included with purchase. Your enhanced eBook allows you to access all of the text, figures, and references from the book on a variety of devices.
Download or read book Contemporary Orthopaedics written by and published by . This book was released on 1993-07 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Versus Performance of Press fit Acetabular Prostheses written by Scott Alan Yerby and published by . This book was released on 1992 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Tapered and Non tapered Fluted Stems on Proximal Stress Shielding and Rotational Stability in the Human Femur written by Steven Andrew Fries and published by . This book was released on 2003 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modular hip implants are now being used in total hip arthroplasty which allow the stem, body, and head to be sized independently. The effect of modular systems using tapered and non-tapered fluted stems on proximal stress shielding and rotational stability in the human femur is the focus of this research. Rotation loosening has become known as a significant cause of failure of the femoral component of total hip arthroplasties. Torsional loading may be the most important factor causing mechanical loosening of the femoral component and the most important cause of fracture of the femoral stem. High torsional stresses in the femur are created when performing everyday activities such as standing up from a seated position and stair climbing. The torsional stiffness and rigidity of femurs with the tapered stems increased as the size of the stem increased. The 15 and 17 mm diameter tapered stems were 31% and 37% greater in torsional stiffness and rigidity than the straight stems of the same size respectively. As the torque increased, the amount of micromotion also increased. The 15 and 17 mm diameter tapered stems displayed less micromotion at all torque levels than the straight stems of the same size. All femurs exhibited stress shielding effects. The greatest amount of stress shielding occurred on the postero-lateral and antero-medial sides at the mid and distal levels. The postero-medial side of the femur demonstrated the largest strains in the single leg stance tests. The tapered stems demonstrated a smaller degree of stress shielding than the straight stems.
Download or read book Press fit Fixation and Viscoelastic Response of a Bone implant Interface in the Distal Femur written by Travis Allen Burgers and published by . This book was released on 2008 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
