Three dimensional shape optimization of total knee replacements for reduced wear

2008 ◽  
Vol 38 (4) ◽  
pp. 405-414 ◽  
Author(s):  
Ryan Willing ◽  
Il Yong Kim
Keyword(s):  
Shape Optimization ◽  
Three Dimensional ◽  
Total Knee Replacements ◽  
Knee Replacements ◽  
Dimensional Shape ◽  
Total Knee ◽  
Three Dimensional Shape

Three-Dimensional Dynamic Simulation of Total Knee Replacement Motion During a Step-Up Task

2001 ◽  
Vol 123 (6) ◽  
pp. 599-606 ◽  
Author(s):  
Stephen J. Piazza ◽  
Scott L. Delp
Keyword(s):  
Activity Patterns ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Knee Kinematics ◽  
Prosthetic Knee ◽  
Total Knee Replacements ◽  
Contact Points ◽  
Flexion Extension ◽  
Knee Replacements ◽  
Total Knee

A three-dimensional, dynamic model of the tibiofemoral and patellofemoral articulations was developed to predict the motions of knee implants during a step-up activity. Patterns of muscle activity, initial joint angles and velocities, and kinematics of the hip and ankle were measured experimentally and used as inputs to the simulation. Prosthetic knee kinematics were determined by integration of dynamic equations of motion subject to forces generated by muscles, ligaments, and contact at both the tibiofemoral and patellofemoral articulations. The modeling of contacts between implants did not rely upon explicit constraint equations; thus, changes in the number of contact points were allowed without modification to the model formulation. The simulation reproduced experimentally measured flexion–extension angle of the knee (within one standard deviation), but translations at the tibiofemoral articulations were larger during the simulated step-up task than those reported for patients with total knee replacements.

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