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TECHNICAL BRIEF

Computational Modeling of a Dynamic Knee Simulator for Reproduction of Knee Loading

[+] Author and Article Information
Trent M. Guess

Department of Mechanical Engineering,  University of Missouri-Kansas City, 350F Robert H. Flarsheim Hall, 5100 Rockhill Road, Kansas City, MO 64110guesstr@umkc.edu

Lorin P. Maletsky

Department of Mechanical Engineering,  The University of Kansas, 1530 W. 15th St., 3138 Learned Hall, Lawrence, KS 66045Maletsky@ku.edu

J Biomech Eng 127(7), 1216-1221 (Jul 29, 2005) (6 pages) doi:10.1115/1.2073676 History: Received June 19, 2003; Revised July 25, 2005; Accepted July 29, 2005

As a first step towards reproducing desired three-dimensional joint loading and motion on a dynamic knee simulator, the goal of this study was to develop and verify a three-dimensional computational model that generated control profiles for the simulator using desired knee loading and motion as model inputs. The developed model was verified by predicting tibio-femoral loading on an instrumented analog knee for given actuator forces and the ability to generate simulator control profiles was demonstrated using a three-dimensional walking profile. The model predicted axial tibia loading for a sagittal-plane dual-limb squat within 1% of measured peak loading. Adding out-of-sagittal-plane forces decreased the accuracy of load prediction. The model generated control profiles to the simulator that produced axial tibia loading within 16% of desired for walking. Discrepancies in predicted and measured quadriceps forces influenced the accuracy of the generated control profiles. Future work will replace the analog knee in both the model and machine with a prosthetic knee.

FIGURES IN THIS ARTICLE
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Copyright © 2005 by American Society of Mechanical Engineers
Topics: Force , Knee , Stress , Motion
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Figures

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Figure 1

Photograph of the Kansas Knee Simulator with analog knee (adduction/abduction actuator below picture)

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Figure 2

KKS computational model with analog knee and controllable axes

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Figure 3

Predicted (– – –) and measured (—) loading for one cycle of the squat profile at the medial axial compression (a), lateral axial compression (b), medial posterior (c), and lateral posterior sensor positions (d)

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Figure 5

One-cycle rms error between predicted and measured loading at the analog knee along with rms error between predicted and measured force on the quadriceps axis for all verification tests

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Figure 6

Predicted (– – –) and measured (—) loading for one cycle of walking at the medial axial compression (a), lateral axial compression (b), medial posterior (c), and lateral posterior sensor positions (d)

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Figure 7

Control axis reference (– – –) and measured feedback (—) for one cycle of walking at the quadriceps axis (a), vertical load axis (b), vertical torque axis (c), and adduction/abduction axis (d)

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