scholarly journals NUMERICAL ANALYSIS OF ELASTOHYDRODYNAMIC LUBRICATION OF TOTAL HIP PROSTHESIS BASED ON THE THEORY OF THREE-DIMENSIONAL ELASTICITY

Biomechanisms ◽  
1988 ◽  
Vol 9 (0) ◽  
pp. 127-137
Author(s):  
Kiyoshi MABUCHI ◽  
Yukio TSUKAMOTO ◽  
Masaru UENO ◽  
Tadashi SASADA
Keyword(s):  
Numerical Analysis ◽  
Hip Prosthesis ◽  
Three Dimensional ◽  
Elastohydrodynamic Lubrication ◽  
Total Hip Prosthesis ◽  
Total Hip ◽  
Three Dimensional Elasticity

scholarly journals Measurement of the femoral neck angle in medium and large dog breeds using computed tomography

2019 ◽  
Vol 67 (1) ◽  
pp. 22-33
Author(s):  
Ahmad Al Aiyan ◽  
Kenneth Richardson ◽  
George Manchi ◽  
Johanna Plendl ◽  
Leo Brunnberg
Keyword(s):  
Computed Tomography ◽  
Femoral Neck ◽  
Hip Prosthesis ◽  
Three Dimensional ◽  
Image Data ◽  
Total Hip Prosthesis ◽  
Total Hip ◽  
Group I ◽  
Group Ii ◽  
Femoral Neck Angle

The aim of this study was to get precise normal values of the femoral neck angle (FNA) in support of developing an optimally functioning total hip prosthesis for medium and large dog breeds. Accordingly, two- and three-dimensional computed tomographic images of the anatomical structures of the proximal femora of 58, hip-dysplasia-free, mature dogs of medium and large breeds were studied. Based on the length of their femora the dogs were allocated to Group I (from 145 to 195 mm) and Group II (from 196 to 240 mm). The FNA was measured on each femur using multi-slice spiral computed tomography (CT). The two- and three-dimensional image data were processed as multi-planar and threedimensional reconstructions using Advantage Workstation software. The CT measurements revealed that Group I had an average femoral neck angle of 147.59° (min. 144.05°, max. 153.35°), while in Group II the average FNA was 147.46° (min. 141°, max. 154.35°). There was no significant correlation between the length of the femur and the FNA in either group. The optimal FNA for a total hip prosthesis is 147.5° for medium and large dog breeds.

Comparison of Two- and Three-Dimensional Methods for Assessment of Orientation of the Total Hip Prosthesis

1988 ◽  
Vol 29 (3) ◽  
pp. 357-361 ◽  
Author(s):  
K. Herrlin ◽  
H. Pettersson ◽  
G. Selvik
Keyword(s):  
Hip Prosthesis ◽  
Three Dimensional ◽  
Total Hip Prosthesis ◽  
Hip Prostheses ◽  
Total Hip ◽  
Total Hip Prostheses ◽  
Prosthetic Component ◽  
High Degree ◽  
Made In

A comparison of two- and three-dimensional methods for the determination of the orientation of total hip prostheses was made in a group of 57 patients. The acetabular inclination and the collum-diaphyseal angle measured on a.p. projections (2-D) were adequate in most cases for assessing how vertically the prosthetic component was inserted, but in individual cases with a high degree of version these measurements could be misleading. Anteversion measured in the transverse plane (2-D) was more sensitive to errors than planar anteversion measured as a rotation around the longest diameter of the ellipsoid projection of the acetabular opening, but it gave a rough estimate of the relation of the prosthetic components. Determination of the spatial (3-D) orientation of the components provides a precise estimate of the component relations.

scholarly journals Mechanical Behavior of Bone Cement under Dynamic Loading

2017 ◽  
Vol 61 (3) ◽  
pp. 204
Author(s):  
Mohammed Elnedhir Belgherras ◽  
Boualem Serier ◽  
Ali Benouis ◽  
Lalia Hachemi
Keyword(s):  
Bone Cement ◽  
Hip Replacement ◽  
Hip Prosthesis ◽  
Three Dimensional ◽  
Dynamic Loads ◽  
The Finite Element Method ◽  
Three Dimensional Model ◽  
Total Hip Prosthesis ◽  
Total Hip ◽  
Climbing Stairs

In orthopedic surgery and particularly in total hip arthroplasty, The fixation of the implant is generally made by the surgical cement, constituted essentially by polymer (PMMA), It is necessary to know the strengths applied to the prosthetic articulation during the current activities exercised by the patient in their life, to know the distribution of the constraints in the system (bone - cement - implant).This study aims to analyze numerically using the finite element method, the effect of activities (dynamic loads) of the patient on the level and distribution of stresses generated in the components of total hip prosthesis. Five activities, the most frequently performed by the patient such as normal walking, the up and down stairs, sitting and up from chair, were selected for this study. For this purpose, a three-dimensional model of the total hip prosthesis has been developed. The results obtained from this model show that the total hip replacement components and especially the bone cement are more highly stressed during the process of climbing stairs. These excessively high loads can lead to damage of the cement and thus the loosening of the prosthesis.

Intrapelvic Extraction of a Total Hip Prosthesis

1992 ◽  
Vol &NA; (282) ◽  
pp. 154???157 ◽  
Author(s):  
RICHARD P. EVANS ◽  
J. PHILLIP NELSON
Keyword(s):  
Hip Prosthesis ◽  
Total Hip Prosthesis ◽  
Total Hip
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