By Frederick F. Buechel, Michael J. Pappas
Drs. Buechel, an orthopaedic doctor, and Pappas, a professor of Mechanical Engineering, are the designers of numerous profitable joint substitute platforms. the main recognized of those is the pioneering LCS knee substitute. they've got written this booklet for the clients and architects of joint replacements. it truly is an try to express to the reader the information accrued by way of the authors in the course of their thirty 5 yr attempt at the improvement of substitute units for the reduce limb for the aim of supporting the reader of their layout and evaluate of joint alternative devices.
The early chapters describe the engineering, clinical and clinical rules wanted for substitute joint review. One needs to comprehend the character and function of the fabrics concerned and their features in vivo, i.e. the reaction of the physique to implant fabrics. it's also necessary to comprehend the reaction of the implants to utilized loading and movement, fairly within the adverse physiological surroundings. A bankruptcy describes the layout method now required for joint substitute within the united states and european international locations. the remainder chapters supply a heritage of joint alternative, an assessment of previous and present units and outline of the layout motive for many of the authors units with which the authors are, after all, particularly familiar.
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Additional info for Principles of Human Joint Replacement: Design and Clinical Application
Chemical Texturing. : Evaluation of Metal Implants Coated with Several Types of Ceramics as Biomaterials. : New Materials for Mobile Bearing Knee Prosthesis - Titanium Nitride Counterface Coatings for Reduction of Polyethylene Wear. In: LCS: Mobile Bearing Knee Arthroplasty - 25 Years of Worldwide Experience, ch. 21. : Simulation of Polyethylene Wear in Ankle Joint Prostheses. : Influence of counterface topography on the wear ofUHMWPE under wet and dry condifions. ) The Proceedings of the American Chemical Society, Polymer Wear and tis Control.
17 Stress Contours for Incongruent Contact. As the metal component slides and rolls over the surface of the weaker plastic surface the point of peak stress will move under the surfaces of the plastic as illustrated in Fig. 18. 56 2 Failure Modes Fig. 18 Movement of Peak Von Mises Stress. If the stress is high enough cracks will initiate below the surface as illustrated in Fig. 19. Fig. 19 Sub-Surface Crack Initiation.
52 2 Failure Modes WEAR RATE, GRAMS/10 6 CYCLES Just as the Co-Cr abrades the UHMWPe, the UHMWPe will also abrade the Co-Cr (albeit much more slowly). This roughened Co-Cr provides a base for the adherence of an UHMWPe film. One then has similar materials in contact, and thus the proper conditions for adhesive wear. The wear rate under these adhesive conditions is much higher than that associated with smooth surface abrasive wear as illustrated in Fig. 14 . 01 0 1 2 3 4 5 6 CYCLES X 106 7 8 9 10 Fig.