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Evaluating knee replacement mechanics during ADL with PID-controlled dynamic finite element analysis.

Clare K Fitzpatrick¹, Mark A Baldwin, Chadd W Clary

¹a Computational Biomechanics Lab , University of Denver , 2390 S. York Street, Denver , CO 80208 , USA.

Computer Methods in Biomechanics and Biomedical Engineering

|June 13, 2012

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Validated computational knee models accurately simulate in vivo loading conditions. This advanced finite element (FE) model, controlled by a proportional-integral-derivative (PID) system, aids in developing better knee replacement devices.

Area of Science:

Biomechanics
Computational modeling
Orthopedic device development

Background:

Computational knee simulations are crucial for designing knee replacement devices.
Previous models lacked dynamic validation and comprehensive in vivo loading simulation.

Purpose of the Study:

To kinematically validate a dynamic finite element (FE) model of the Kansas knee simulator.
To interface a proportional-integral-derivative (PID) controller for accurate actuator control.
To enhance the model's fidelity for simulating in vivo loading conditions during dynamic activities.

Main Methods:

Developed and validated a dynamic FE model of a knee simulator.
Interfaced a PID controller to manage quadriceps actuator excursion for target flexion profiles.

Keywords:

finite element analysis knee simulator proportional–integral–derivative control tibiofemoral joint loading

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Expanded the controller for simultaneous multi-actuator operation to replicate in vivo joint loading.

Improved model fidelity by incorporating additional muscle representations and hip-ankle A-P motion.

Main Results:

The PID-controlled FE model successfully recreated target flexion profiles.
The model accurately simulated in vivo loading conditions, including joint loads and torques.
Successful recreation of loading for activities like deep knee bend, chair rise, gait, and step-down.

Conclusions:

The validated and enhanced computational knee model accurately replicates in vivo loading conditions.
This advanced simulation tool is valuable for the design and development phases of knee replacement devices.
The PID-controlled multi-actuator system enables realistic simulation of dynamic joint loading.