A Method of Material Optimization of Cementless Stem Through Functionally Graded Material

Hedia, Hassan S.; Shabara, Mohamed Ahmed Nasr; El-Midany, T. T.; Fouda, Noha

doi:10.1007/s10999-005-3307-4

Cited by 35 publications

(31 citation statements)

References 18 publications

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“…For example, natural bone changes from a dense, stiff external structure (cortical bone) to a porous internal one (cancellous bone) which demonstrates its functional gradation and optimizes the material's response to external loading. Therefore, the optimized structure for an artificial implant should show similar gradation [17]. Therefore, functionally graded material (FGM) can be used to improve the performance of artificial joints.…”

Section: Methodsmentioning

confidence: 99%

“…Hedia et al [15][16][17] and Hedia and Nemat-Alla [18] focused their studies on improving the performance of the cementless metalbacked acetabular cup, stem and dental implant through functionally graded material. They developed finite element models using ANSYS program in order to optimize the implant materials and the variation of the composition of the materials.…”

Section: Introductionmentioning

confidence: 99%

“…They found that, for the acetabular cup it is better to change the elastic modulus in the radial direction than changing it in the tangential direction because von Mises stress will be increased on a wide area in bone at the dome of acetabulum, leading to a reduction in the stress shielding effect [15,16]. While, for the cementless hip prosthesis stem material the use of FGM reduced the stress shielding at the proximal lateral bone and the maximum interface shear stress at the stem-bone interface compared to homogenous titanium stem [17]. Furthermore, the hydroxyapatite-titanium FGM dental implant reduced the stress concentration in the cortical bone and implant compared with conventional titanium and stainless steel implants [18].…”

Section: Introductionmentioning

confidence: 99%

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Material selection in the design of the tibia tray component of cemented artificial knee using finite element method

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Bondok²

2013

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Material selection in the design of the tibia tray component of cemented artificial knee using finite element method

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Bondok²

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“…Three different material combinations were suggested: titanium, cobalt chromium, and hydroxyapatite. Hedia et al [106] compared numerical models of 1D FGM and 2D FGM for the acetabular cup of a hip implant. A combination of titanium, bio-glass and hydroxyapatite was suggested.…”

Section: Porositymentioning

confidence: 99%

Lattice Structures and Functionally Graded Materials Applications in Additive Manufacturing of Orthopedic Implants: A Review

Mahmoud

Elbestawi

2017

JMMP

201

117

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A major advantage of additive manufacturing (AM) technologies is the ability to print customized products, which makes these technologies well suited for the orthopedic implants industry. Another advantage is the design freedom provided by AM technologies to enhance the performance of orthopedic implants. This paper presents a state-of-the-art overview of the use of AM technologies to produce orthopedic implants from lattice structures and functionally graded materials. It discusses how both techniques can improve the implants' performance significantly, from a mechanical and biological point of view. The characterization of lattice structures and the most recent finite element analysis models are explored. Additionally, recent case studies that use functionally graded materials in biomedical implants are surveyed. Finally, this paper reviews the challenges faced by these two applications and suggests future research directions required to improve their use in orthopedic implants.

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“…An example of this approach is the model presented by Kuiper and Huiskes [22], where the cost function is the difference between the shear stress at stem-bone interface and a reference value. Hedia et al [23] used a two-dimensional model to minimize the maximum shear stress value at the interface. In both cases, the optimized implants are stiffer in the proximal part and the modulus of elasticity decreases up to the distal part.…”

Section: Uncemented Stemsmentioning

confidence: 99%

Bone Implant Design Using Optimization Methods

Fernandes

Ruben

Folgado

2010

Biomechanics of Hard Tissues

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Total hip arthroplasty (THA) is a successful treatment for joint and bone diseases as well as in fracture repair [1]. It involves the replacement of the natural joint by an artificial one, composed of a femoral stem and an acetabular component as shown in Figure 10.1. The femoral component can be classified as cemented or uncemented depending on the mode of fixation. Cemented stems are fixed using a bone cement layer between the femur and the implant, while cementless stems are placed directly in contact with the bone. In this case, the biological fixation is promoted by the stem coating such as hydroxyapatite or in general a porous surface.In the first 10 years after surgery, the THA success is greater than 80%; nevertheless, it is possible to indentify some causes of failure. Aseptic loosening is the main cause for failure, being responsible for approximately 60% of revisions [1,4]. This failure can be due to mechanical problems such as excessive bone loss [5], inefficient initial stability [6], or cement mantle fatigue [7]. Thigh pain is another important mechanical cause for implant failure, with more than 6% of incidence [4]. On the other hand, deep infection is the major biological problem with more than 5% of prevalence [1,4]. Actually, the majority of failures of the THA are related to mechanical factors.Regarding the mode of fixation, cemented stems are globally more durable than cementless ones, with a 90% survival rate after 12 years. For uncemented implants this rate is less than 80% [1]. However, some cementless stems achieve more than 95% survival rate after 12 years. In fact, cementless stems with good initial stability and osseointegration exhibit a superior performance [8]. Cemented stems are preferred for elderly people, but, for patients less than 60 years old, the number of uncemented stems has increased, particularly, in the past few decades. In the early 1990s cementless stems represented only 20% of THA and in 2005 this value increased to approximately 45% [1].As stated above, the long-term implant success is strongly related to mechanical factors. For cementless stems the initial mechanical conditions on bone-implant interface (primary stability) are very important for success of the prosthesis. In

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A Method of Material Optimization of Cementless Stem Through Functionally Graded Material

Cited by 35 publications

References 18 publications

Material selection in the design of the tibia tray component of cemented artificial knee using finite element method

Material selection in the design of the tibia tray component of cemented artificial knee using finite element method

Lattice Structures and Functionally Graded Materials Applications in Additive Manufacturing of Orthopedic Implants: A Review

Bone Implant Design Using Optimization Methods

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