ADAPTIVE BONE REMODELING CRITERIA APPLIED TO DESIGN OPTIMIZATION OF FEMORAL COMPONENT OF HIP PROSTHESES

2005 ◽  
Vol 05 (01) ◽  
pp. 191-202 ◽  
Author(s):  
HAMID KATOOZIAN ◽  
ZOHREH BARANI ◽  
DWIGHT T. DAVY
Keyword(s):  
Femoral Component ◽  
Numerical Procedure ◽  
Optimization Procedure ◽  
3D Design ◽  
Element Analysis ◽  
Physiological Factors ◽  
Hip Prostheses ◽  
Total Hip ◽  
Design Variables ◽  
Hip Replacements

Considering effects of physiological factors in failure of total hip arthroplasty, a numerical procedure was implemented for the three-dimesional (3D) shape optimization of femoral component of total hip replacements on the basis of remodeling objective functions. Design variables are the shape parameters, which define the femoral component geometry. The 3D design model was incorporated with 3D finite element analysis and a numerical optimization procedure. The main optimization goal was to reduce the potential for change of the bone morphology and to keep it close to the normal condition of an intact femur, by changing the geometry of the implant. Both local and global remodeling goals were examined. The results suggest a much more slender implant than is normally used would be required to minimize the remodeling potential. The results also demonstrated that the outcomes are indeed sensitive to whether the remodeling goal is treated as local or global.

Design and Optimization of Stamping Process to Improve Manufacturing Feasibility

2000 ◽  
Author(s):  
H. Naceur ◽  
Y. Q. Guo ◽  
J. L. Batoz
Keyword(s):  
Numerical Procedure ◽  
Optimization Procedure ◽  
Forming Limit Diagram ◽  
Forming Limit ◽  
Programming Technique ◽  
Design And Optimization ◽  
Stamping Process ◽  
Design Variables ◽  
Risk Of Rupture ◽  
Analytical Sensitivities

Abstract In this paper, we present a numerical procedure combining a finite element inverse approach (I.A.) [10, 14–18] for the simplified analysis of the stamping process with a mathematical programming technique (BFGS method) to optimize some process parameters. Our objective is to optimize the quality of the final workpiece, by minimizing the risk of rupture and wrinkles. The design variables of the present problem are the drawbead restraining forces in relation with the Forming Limit Diagram (FLD). The optimization procedure associated to the analytical sensitivities analysis technique based on the adjoint method is applied for the square cup of Numisheet’93 and the Twingo dashpot cup proposed by RENAULT [32]. The satisfactory results demonstrate the usefulness of this automatic optimization procedure in the preliminary design of deep-drawing process.

Femoral Anteversion and Restricted Range of Motion in Total Hip Prostheses

1988 ◽  
Vol 29 (5) ◽  
pp. 551-553 ◽  
Author(s):  
K. Herrlin ◽  
H. Pettersson ◽  
G. Selvik ◽  
L. Lidgren
Keyword(s):  
Range Of Motion ◽  
Femoral Component ◽  
Hip Prosthesis ◽  
Femoral Anteversion ◽  
Restricted Range ◽  
Total Hip Prosthesis ◽  
Hip Prostheses ◽  
Total Hip ◽  
Total Hip Prostheses

Impingement of the neck of the stem on to the rim of the socket may cause dislocation of the total hip prosthesis. The role of femoral anteversion in the occurrence of such impingement was analyzed in a clinical material of total hip prostheses with and without dislocation. A low femoral anteversion was linked to a clinically relevant reduction of the range of motion due to impingement and dominated in the group with dislocations. Impingement is minimized by inserting the femoral component in 10° to 20° of anteversion.

scholarly journals Finite element analysis of polyethylene wear in total hip replacement: A literature review

2019 ◽  
Vol 233 (11) ◽  
pp. 1067-1088 ◽  
Author(s):  
Lin Wang ◽  
Graham Isaac ◽  
Ruth Wilcox ◽  
Alison Jones ◽  
Jonathan Thompson
Keyword(s):  
Finite Element ◽  
Literature Review ◽  
Hip Replacement ◽  
Material Selection ◽  
Polyethylene Wear ◽  
Element Analysis ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements ◽  
Modelling Techniques

Evaluation and prediction of wear play a key role in product design and material selection of total hip replacements, because wear debris is one of the main causes of loosening and failure. Multifactorial clinical or laboratory studies are high cost and require unfeasible timeframes for implant development. Simulation using finite element methods is an efficient and inexpensive alternative to predict wear and pre-screen various parameters. This article presents a comprehensive literature review of the state-of-the-art finite element modelling techniques that have been applied to evaluate wear in polyethylene hip replacement components. A number of knowledge gaps are identified including the need to develop appropriate wear coefficients and the analysis of daily living activities.

Properties of HEMA and MMA Polymer for Introducing it as an Interface Material Between Prosthesis and Bone Cement in THR

2000 ◽  
Author(s):  
Sanjay Aggarwal ◽  
Avinash Tekawade ◽  
Larry Chew ◽  
David Nicholson ◽  
Kevin Belfield ◽  
...  
Keyword(s):  
United States ◽  
Bone Cement ◽  
Postoperative Care ◽  
The United States ◽  
Surgical Approaches ◽  
Hip Prostheses ◽  
Total Hip ◽  
Hip Replacements ◽  
Total Hip Prostheses

Abstract Modern hip replacements were developed in the late 1950s and have since evolved in surgical approaches, implants, and postoperative care. Consequently, surgeons use a wide variety of methods to implant more than 120000 total hip prostheses in the United States per year (National Institute of Health, 1994).

In vitro measurement of strain in the bone cement surrounding the femoral component of total hip replacements during simulated gait and stair-climbing

1996 ◽  
Vol 14 (5) ◽  
pp. 769-777 ◽  
Author(s):  
Daniel O. O'Connor ◽  
Dennis W. Burke ◽  
Murali Jasty ◽  
Ronald C. Sedlacek ◽  
William H. Harris
Keyword(s):  
Bone Cement ◽  
Femoral Component ◽  
Stair Climbing ◽  
Total Hip ◽  
Total Hip Replacements ◽  
Hip Replacements
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