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TECHNICAL PAPERS: Joint/Whole Body

Simulating Dynamic Activities Using a Five-Axis Knee Simulator

[+] Author and Article Information
Lorin P. Maletsky

Department of Mechanical Engineering, The University of Kansas, 1530 W. 15th St., 3138 Learned Hall, Lawrence, KS 66045-2234

Ben M. Hillberry

School of Mechanical Engineering, Purdue University, Mechanical Engineering Building, #1288, West Lafayette, IN 47907-1288

J Biomech Eng 127(1), 123-133 (Mar 08, 2005) (11 pages) doi:10.1115/1.1846070 History: Revised April 22, 2002; Revised July 06, 2004; Online March 08, 2005
Copyright © 2005 by ASME
Topics: Force , Stress , Knee , Machinery
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References

Figures

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Photograph of Purdue Knee Simulator: Mark II
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A skeletal representation of the five axes of loading for the knee simulator
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Kinematic model of the knee simulator. Link 3 is the femur, link 4 the tibia, and link 2 the height of the hip sled.
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The dynamic model of the patella showing the variables that define the moving contact point
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Free body diagram of the knee simulator showing the eleven forces that are part of the sagittal plane dynamic model
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Input load and torque profiles for validation simulations. (Solid lines are vertical loads and dashed lines are ankle moments.)
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Predicted in vivo tibio-femoral loading at the knee for a 800 N subject walking at 1 Hz
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Vertical load tracking with and without quadriceps cross-coupling for the knee flexing from 10 to 70° knee flexion
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A comparison of quadriceps tension for simple loading profiles. (Solid lines are model predictions and dashed lines are experimentally measured data.)
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A comparison of tibio-femoral compressive forces for simple loading profiles. (Solid lines are model predictions and dashed lines are experimentally measured data.)
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A comparison of quadriceps tension with addition of ankle-flexion moment. Note the reduction in loading when compared with Fig. 9 that does not include the ankle-flexion moment.
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A comparison between desired compressive tibio-femoral loads from in vivo prediction of joint loads and experimental results. The heavy dashed line represents the expected loading if the imperfect tracking of the knee simulator is included.
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Quadriceps loads for walking. The model prediction is the solid line and the experimental data is the dashed line.

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