Dynamic stress response of the implant/cement interface: An axisymmetric analysis of a knee tibial component

1990 ◽  
Vol 8 (3) ◽  
pp. 435-447 ◽  
Author(s):  
A. M. Ahemd ◽  
M. Tissakht ◽  
S. C. Shrivastava ◽  
K. Chan
Keyword(s):  
Stress Response ◽  
Tibial Component ◽  
Dynamic Stress ◽  
Cement Interface

scholarly journals A randomized controlled trial comparing tibial migration of the ATTUNE cemented cruciate-retaining knee prosthesis with the PFC-sigma design

2020 ◽  
Vol 102-B (9) ◽  
pp. 1158-1166
Author(s):  
Bart L. Kaptein ◽  
Peter den Hollander ◽  
Bregje Thomassen ◽  
Martha Fiocco ◽  
Rob G. H. H. Nelissen
Keyword(s):  
Tibial Component ◽  
Controlled Trial ◽  
Weight Bearing ◽  
Controlled Clinical Trial ◽  
Fixed Bearing ◽  
Cruciate Retaining ◽  
Cement Interface ◽  
Randomized Controlled ◽  
Press Fit ◽  
Patient Reported

Aims The primary objective of this study was to compare migration of the cemented ATTUNE fixed bearing cruciate retaining tibial component with the cemented Press-Fit Condylar (PFC)-sigma fixed bearing cruciate retaining tibial component. The secondary objectives included comparing clinical and radiological outcomes and Patient Reported Outcome Measures (PROMs). Methods A single blinded randomized, non-inferiority study was conducted including 74 patients. Radiostereometry examinations were made after weight bearing, but before hospital discharge, and at three, six, 12, and 24 months postoperatively. PROMS were collected preoperatively and at three, six, 12, and 24 months postoperatively. Radiographs for measuring radiolucencies were collected at two weeks and two years postoperatively. Results The overall migration (mean maximum total point motion (MPTM)) at two years was comparable: mean 1.13 mm (95% confidence interval (CI), 0.97 to 1.30) for the ATTUNE and 1.16 mm (95% CI, 0.99 to 1.35) for the PFC-sigma. At two years, the mean backward tilting was -0.43° (95% CI, -0.65 to -0.21) for the ATTUNE and 0.08° (95% CI -0.16 to 0.31), for the PFC-sigma. Overall migration between the first and second postoperative year was negligible for both components. The clinical outcomes and PROMs improved compared with preoperative scores and were not different between groups. Radiolucencies at the implant-cement interface were mainly seen below the medial baseplate: 17% in the ATTUNE and 3% in the PFC-sigma at two weeks, and at two years 42% and 9% respectively (p = 0.001). Conclusion In the first two postoperative years the initial version of the ATTUNE tibial component was not inferior with respect to overall migration, although it showed relatively more backwards tilting and radiolucent lines at the implant-cement interface than the PFC-sigma. The version of the ATTUNE tibial component examined in this study has subsequently undergone modification by the manufacturer. Level of Evidence: 1 (randomized controlled clinical trial) Cite this article: Bone Joint J 2020;102-B(9):1158–1166.

Dynamic Stress Response of Concrete Pavements to Moving Tandem-Axle Loads

2002 ◽  
Vol 1809 (1) ◽  
pp. 32-41 ◽  
Author(s):  
Seong-Min Kim ◽  
Moon C. Won ◽  
B. Frank McCullough
Keyword(s):  
Stress Response ◽  
Dynamic Stress ◽  
Concrete Pavements ◽  
Axle Loads

Measured Dynamic Stress Response of a Semisubmersible Drilling Rig

1985 ◽  
Author(s):  
T.C. Thuestad ◽  
T.D. Hanson ◽  
I. Vik ◽  
T. Slind
Keyword(s):  
Stress Response ◽  
Dynamic Stress ◽  
Drilling Rig

Analysis of Dynamic Stress Responses in Structural Vibration

1997 ◽  
Author(s):  
Liping Huang
Keyword(s):  
Stress Response ◽  
Frequency Response ◽  
Normal Mode ◽  
Stress Responses ◽  
Dynamic Stress ◽  
Complex Stress ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Response Analysis ◽  
Shell Elements

Abstract This paper describes basic concepts and finite element method of dynamic stress response analysis. It provides basics of stress modal analysis and frequency response analysis. The paper defines concepts of normal mode stresses and complex stress frequency response functions for shell elements and shows that element stress responses in both time and frequency domains can be expressed as superposition of normal mode stresses. It demonstrates that element stress response solutions have the similar forms to those of node displacement responses and that normal mode stresses in stress analysis play the same role as mode shapes in normal vibration analysis.

Characterizing the dynamic stress response on neuroendocrine and neural network level

2017 ◽  
Vol 83 ◽  
pp. 14
Author(s):  
Magdalena Sandner ◽  
Giannis Lois ◽  
Michèle Wessa
Keyword(s):  
Neural Network ◽  
Stress Response ◽  
Dynamic Stress

Optimization Method Research for Stiffened Thin Wall Structure’s Vibration Suppression Based on Parametric Modeling Technique

2015 ◽  
Vol 798 ◽  
pp. 113-118
Author(s):  
Wei Jin ◽  
Bin Jie Mou ◽  
Hu Huang ◽  
Huan Bing Fu
Keyword(s):  
Stress Response ◽  
Random Vibration ◽  
Dynamic Stress ◽  
Fatigue Property ◽  
Parametric Modeling ◽  
Modeling Technique ◽  
Stiffened Panel ◽  
Thin Wall ◽  
Vibration Fatigue ◽  
Inlet Duct

Stiffened Thin Wall Panel Structure is a widely used structural configuration in the design of aircraft’s inlet duct and large open bay. Vibration fatigue failure of stiffened panel structure will quickly emerges under strong broadband random loading environment which caused by shock waves moving at the inlet lip and cavity vortex and shear layer oscillation during flight. At present, a main research focus on dynamic strength design of aircraft’s light-weight structure is to reduce the dynamic stress response level in broadband random vibration environment ,so as to improve the ability of thin wall panel’s vibration fatigue property with light structure weight. Taking a stiffened thin panel of inlet duct as a typical case under random vibration excitation environment, an Advanced dynamical topology optimization methods is established based on the parametric modeling technique . Within the main frequency domain of external dynamic load, the maximum root mean square of stress (MRMSS) for global element of stiffened panel structure is calculated and optimized under the weight constraint with Genetic Optimization Algorithm (GOA). The comparison of structural stress response before and after optimization design shows that the maximum element RMS dynamic stress is reduced by 38% with the weight increased by about 9.8% and the purpose of improving vibration fatigue property is reached.

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