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| | | Tibia | Femur | | x | 0 | free | | y | 0 | free | | z | 0 | -100 N ramp t=0-1sec; constant t=1-2.5sec | | Rx | 0 | 0 deg t=0-1 sec; 45 deg t=1-2.5sec | | Ry | 0 | free | | Rz | 0 | free | |
|| || Tibia || Femur || || x || 0 || free || || y || 0 || free || || z || 0 || -100 N ramp t=0-1sec; constant t=1-2.5sec || || Rx || 0 || 0 deg t=0-1 sec; 45 deg t=1-2.5sec || || Ry || 0 || free || || Rz || 0 || free || |
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| attachment:flexion.png | {{attachment:flexion.png}} |
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| ==== Stress/Strain Comparison ==== Likewise, stress, strain, and contact pressure distributions were also nearly identical. A comparison of contour plots of the 3rd principal strain and contact pressure for the tibial cartilage are shown below. ''' Third Principal Green-Lagrange Strain (Pure Compression) ''' {{attachment:p3strain.png}} ''' Contact Pressure ''' {{attachment:cpress.png}} |
Passive Flexion
A predictive model of passive flexion of the knee to 45 degrees. All materials and contact interactions are the same as described on the wiki frontpage.
Loads and Boundary Condtions
|
Tibia |
Femur |
x |
0 |
free |
y |
0 |
free |
z |
0 |
-100 N ramp t=0-1sec; constant t=1-2.5sec |
Rx |
0 |
0 deg t=0-1 sec; 45 deg t=1-2.5sec |
Ry |
0 |
free |
Rz |
0 |
free |
Platform
Employed 8 threads on Ohio Supercomputing Center's Glenn cluster - 1 node; 2 quad core 64 bit AMD Opterons; Linux.
Results
The model converged with a solution wall clock time of 32:44:25. The equivalent model in dynamic analysis on 8 threads took 10:17:39. The static model took approximately 218% longer to solve.
Kinematic Comparison
The static and dynamic models exhibited essentially identical kinematics as seen in the following plots.
Flexion
Internal/External Rotation
Varus/Valgus Rotation
Stress/Strain Comparison
Likewise, stress, strain, and contact pressure distributions were also nearly identical. A comparison of contour plots of the 3rd principal strain and contact pressure for the tibial cartilage are shown below.
Third Principal Green-Lagrange Strain (Pure Compression)
Contact Pressure
