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M/L Taper Hip Prosthesis | Zimmer Biomet

T1 - Materials selection for hip prosthesis by the method of weighted properties

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Hip Replacement Implant Materials

For this problem to be addressed, an FE numerical method was developed to predict the progressive failure of a thick laminated composite femoral component for hip arthroplasty. With a laminated composite stem, the designer has the freedom to vary the orientation of each ply and the stacking sequence to achieve beneficial stiffness, stress distribution, component strength, and physiological performance [3,6,17,23-26]. With this in mind, we developed our methodology for designing composite orientation and stacking sequence with the objective to maximize the composite stem fatigue strength in critical regions while minimizing stress shielding effects and keeping the interfacial stresses below user-defined maximum levels. In this paper, we present a numerical method for predicting the progressive failure of a thick laminated composite femoral component. A 3-D global/3-D local technique was developed to capture the overall structural response of this system while also enabling the 3-D ply-level stress state to be determined efficiently and accurately. Different failure criteria and material degradation models were incorporated in this method, giving it the flexibility to simulate a wide range of materials and structures. We also conducted numerical modeling to support the design of experimental test methods for component fatigue testing, which closely simulated in vivo loading conditions. We then conducted parametric studies with the numerical model of an experimental system and compared the results to the damaged behavior of the experimentally determined composite component to assess which parameter set most accurately predicted the actual damage development behavior. Finally, we then applied the best-fitting parameter set to analyze simulated in situ composite femoral components for comparing a variety of implant designs.

Design, analysis, and material considerations of a composite material artificial hip implant

3such that the interfacial stiffness is very close to that of thespongy bone that it is replacing.
Ideally, the yield strength of the implanted material will beequal to or higher than the bony material it is intended to replacesuch that a sharp blow will fracture tissue (that can heal itself)rather than the implant (that cannot).
Within the hip joint the implanted material is subject to manyintermittent cyclic loads, sometimes up to five times the patient'sbody weight (, stresses of 1000 lbs/in2many thousands of times per day).

Hip Disarticulation Prosthesis at Award Prosthetics

20/12/2017 · A new material for hip prosthesis without considerable debris release

N2 - Process of materials selection for an artificial part, which is planted in vivo, has been always a vital procedure. Production and construction requirements for implants would involve a wide variety of considerations from mechanical specifications to medical limitations. From mechanical point of view, it is desired the implant exhibits mechanical properties of the missing bone as close as possible to reduce the risk of failure and provide a high level of comfort to the patient. The most bolded medical trait that prostheses must possess is the quality of biocompatible being; meaning that, they have to be accepted by the body’s living organisms. In this paper, five common biocompatible materials as candidates for hip prostheses production namely, 316L St Steel (cold worked, ASTM F138), Co–28Cr–6Mo (cast, ASTM F75), Ti–6Al–4V (hot forged, ASTM F620), Zirconia (ceramic, 3Y-TZP) and Alumina (ceramic, ZTA) are selected and evaluated by the method of weighted properties, in order to narrow down the search to find the candidate which best fit the real bone’s mechanical traits. For the analysis, six attributes were considered and weighted against each other namely, elastic modulus, yield strength, tensile strength, fatigue strength, corrosion rate and density. From the results, alumina and stainless steel show highest performance indexes but as it is discussed, due to the importance of biocompatibility required in practical, materials ranked on position 4th and 5th which are respectively of cobalt and titanium alloys–although are less mechanically similar to the real bone, are the most desirable choices in the industry. It will be concluded that in the process of materials selection for implants.

When the two components (the ball and the socket) of a hip implant rub together, a small percentage of those components are actually released and accumulate in the person’s tissues. While some people are more sensitive to them than others, these released particles have been known to create significant complications. Depending on the materials from which the hip implant has been created, different types of particles will be released into the body.

Total Hip Replacement - OrthoInfo - AAOS

Material selection of acetabular component in human hip prosthesis using finite element concepts ..

A total hip joint replacement involves a surgical operation. The patient is given an anaesthetic, and the surgeon replaces the damaged parts of the joint with artificial materials. In the hip joint, the damaged ball is replaced by a metal or ceramic ball with a metal stem that fits down the femur. A new plastic socket is implanted into the pelvis to replace the old, damaged socket.

The final consideration in your hip replacement will be the articulation between the new ball and socket. The balls can be made from metal or ceramic and the sockets can be made from metal, ceramic or plastic. We do not perform hip replacements using metal on metal bearings.

The objective of this study was to establish the role of loads and prosthesis material properties on the mechanics of the proximal femur after total hip arthroplasty.
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  • Cosmetic Restoration - Finger Prosthesis Manufacturer …

    Hip Disarticulation Specialist Tony van der Waarde | Award Prosthetics

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Special AHIMA Edition September 2013

Because of the numerous problems associated with hip replacements, it is crucial that patients are aware of and understand the risks before making the decision to have hip surgery. If your doctor is pressing you to get the surgery and doesn’t explain the risks or alternatives, you should get a second opinion. The non-surgical alternatives include stem cell and platelet rich plasma therapy. They have considerably less risks and the recovery is much less. So, do your homework and make an informed decision. Your long-term health may depend on it.

Coding for Hip Replacement Surgery For The Record Vol

Many materials are suitable for socket fabrication. As is the case with other levels of lower-limb amputation, the most commonly utilized socket material is a rigid thermosetting resin: polyester or acrylic. An increasing trend toward more flexible thermoplastic materials is evident, as in other aspects of prosthetic practice. One of the authors (J.W.M.) has fitted more than two dozen polypropylene/polyethylene copolymer sockets for hip-level amputation over the past decade with good long-term results in durability, comfort, and patient acceptance (Fig 21B-14.).

Normally, the hip functions as a ball-and-socket joint

Metal-on-plastic implants tend to release low levels of polyethylene particles which can lead to a condition known as osteolysis. This condition occurs as the body attempts to clean up and remove any foreign particles released from the implant and is responsible for approximately 75 percent of all problems associated with hip replacements. As the body’s immune system attempts to remove and/or dissolve these particles, it triggers an autoimmune response where bones start reabsorbing their own cells. Over time, the implant is likely to completely fail as a result of the loosening of the prosthesis, which is unable to remain securely attached to less and less bone matter.

Types of Hip Replacement and Methods of Fixation - …

AB - Process of materials selection for an artificial part, which is planted in vivo, has been always a vital procedure. Production and construction requirements for implants would involve a wide variety of considerations from mechanical specifications to medical limitations. From mechanical point of view, it is desired the implant exhibits mechanical properties of the missing bone as close as possible to reduce the risk of failure and provide a high level of comfort to the patient. The most bolded medical trait that prostheses must possess is the quality of biocompatible being; meaning that, they have to be accepted by the body’s living organisms. In this paper, five common biocompatible materials as candidates for hip prostheses production namely, 316L St Steel (cold worked, ASTM F138), Co–28Cr–6Mo (cast, ASTM F75), Ti–6Al–4V (hot forged, ASTM F620), Zirconia (ceramic, 3Y-TZP) and Alumina (ceramic, ZTA) are selected and evaluated by the method of weighted properties, in order to narrow down the search to find the candidate which best fit the real bone’s mechanical traits. For the analysis, six attributes were considered and weighted against each other namely, elastic modulus, yield strength, tensile strength, fatigue strength, corrosion rate and density. From the results, alumina and stainless steel show highest performance indexes but as it is discussed, due to the importance of biocompatibility required in practical, materials ranked on position 4th and 5th which are respectively of cobalt and titanium alloys–although are less mechanically similar to the real bone, are the most desirable choices in the industry. It will be concluded that in the process of materials selection for implants.

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