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A Contusion Model of Severe Spinal Cord Injury in Rats
Published on: August 17, 2013
Spasticity in rats with sacral spinal cord injury
D J Bennett1, M Gorassini, K Fouad
1Division of Neuroscience, University of Alberta, Edmonton, Alberta, Canada.
Journal of Neurotrauma
|February 16, 1999
Summary
Researchers created a novel rat model of muscular spasticity by targeting sacral spinal cord lesions. This model effectively mimics human spasticity symptoms in tail muscles without impacting other functions.
Area of Science:
- Neuroscience
- Animal Models
- Spinal Cord Injury Research
Background:
- Muscular spasticity is a common and debilitating symptom following spinal cord injury.
- Existing animal models often involve significant disruption to motor function, complicating research.
- A minimally disruptive model is needed to study spasticity mechanisms and potential treatments.
Purpose of the Study:
- To develop a novel, minimally disruptive rat model of muscular spasticity.
- To investigate sacral spinal cord lesions affecting only tail musculature.
- To characterize the development and features of spasticity in the tail.
Main Methods:
- Sacral spinal cord transections at the S2 level in rats.
- Assessment of tail muscle activity, tone, and reflexes post-transection.
- Measurement of hypertonia, hyperreflexia, clonus, and Hoffman reflexes (H-reflexes).
Main Results:
- Spinal transection led to initial tail muscle inactivity followed by developing hypertonia, hyperreflexia, and clonus.
- Muscle stretch and cutaneous stimulation elicited spasms and increased muscle tone.
- Significant increases in H-reflexes were observed post-spinalization.
Conclusions:
- Sacral spinal rats develop tail muscle spasticity with characteristics similar to human limb spasticity.
- This model offers a convenient and accessible preparation for studying spasticity.
- The model's minimal disruption allows for focused investigation of spasticity pathophysiology.
