Controlling Anterior Shear During lsokinetic Knee Extension Exercise

Area of Science:

• Biomechanics
• Orthopedics
• Sports Medicine

Background:

• Anterior cruciate ligament (ACL) injuries present complex challenges in knee function, failure, and healing.
• Controlling anterior shear force during rehabilitation is crucial for effective knee recovery.
• Existing isokinetic exercise equipment may not adequately address specific ACL rehabilitation needs.

Purpose of the Study:

• To present a novel device for controlling anterior shear force during isokinetic knee exercise.
• To evaluate the device's ability to modulate stress on knee ligaments.
• To explore applications in managing chronically lax knees and post-ACL reconstruction rehabilitation.

Main Methods:

• Development of a dual-pad attachment for standard exercise equipment.
• Calculation of loading configurations to demonstrate the device's effect on shear force.
• Pilot roentgenographic study to assess tibiofemoral alignment and joint velocity during isometric extension.

Main Results:

• The dual-pad device allows adjustable anterior shear force levels, from minimal to standard equipment levels.
• Calculated configurations illustrate effective control over shear forces.
• Pilot study indicated restoration of normal tibiofemoral alignment and joint surface velocity vectors.

Conclusions:

• The developed device offers a controllable method for applying anterior shear force during isokinetic exercise.
• Preliminary findings suggest improved knee alignment and joint mechanics with device use.
• The device shows promise for clinical application in treating knee laxity and aiding ACL rehabilitation.