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Electrical stimulation on joint contracture: an experiment in rat model with direct current
M Akai1, Y Shirasaki, T Tateishi
1Department of Physical Therapy, Tsukuba College of Technology, Ibaraki, Japan.
Archives of Physical Medicine and Rehabilitation
|April 1, 1997
Summary
Electrical stimulation may reduce joint stiffness in rats. Constant direct current applied to immobilized knee joints showed increased deformation and viscosity, suggesting potential for reducing joint contracture.
Area of Science:
- Biomechanics
- Electrophysiology
- Orthopedics
Background:
- Joint stiffness and contracture are significant challenges following immobilization.
- Understanding the effects of electrical stimulation on joint tissue properties is crucial for developing therapeutic interventions.
Purpose of the Study:
- To investigate the efficacy of constant direct current electrical stimulation in mitigating joint stiffness.
- To assess the biomechanical changes in immobilized rat knee joints following electrical stimulation.
Main Methods:
- Rat knee joints were immobilized, followed by application of 20 microA or 50 microA constant direct current.
- Biomechanical assessment using cantilevered bone-joint-bone samples measured joint contracture via spectral analysis and dynamic stiffness.
- Vibration analysis and transfer function measurements were employed to evaluate mechanical properties.
Main Results:
- Vibration analysis did not reveal significant differences among groups.
- Spectral analysis showed increased deformation and viscosity in stimulated groups compared to the sham group, particularly at low frequencies.
- Electrical stimulation demonstrated a trend towards reduced joint contracture.
Conclusions:
- Constant direct current electrical stimulation shows potential in reducing joint contracture.
- The findings suggest that electrical stimulation can alter the mechanical properties of immobilized joint tissues.