Quantitative Evaluation of Post-stroke Spasticity Using Neurophysiological and Radiological Tools: A Pilot Study.

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Stroke commonly causes spasticity, impacting motor function and quality of life.
• Quantitative assessment of spasticity is crucial for effective treatment but remains challenging.
• Existing clinical scales for spasticity lack objective, quantitative measures.

Purpose of the Study:

• To explore the utility of electromyography (EMG) and ultrasonography as novel tools for quantitative spasticity assessment in post-stroke patients.
• To investigate the correlation between established clinical spasticity scales and objective biomechanical measurements.

Main Methods:

• Eight hemiplegic stroke patients with ankle plantarflexor spasticity were assessed using the Modified Ashworth Scale (MAS) and Modified Tardieu Scale (MTS).
• Surface electromyography (sEMG) was performed using the Brain Motor Control Assessment (BMCA) protocol.
• Ultrasonography measured muscle architecture (fascicle length, pennation angle) and elasticity index of the medial gastrocnemius muscle (GCM).

Main Results:

• MAS and MTS scores significantly correlated with sEMG activity.
• The spastic medial GCM showed decreased fascicle length and pennation angle, and increased elasticity index compared to the unaffected side.
• MTS values correlated significantly with the elasticity index, indicating a link between clinical and ultrasound measures.

Conclusions:

• The BMCA protocol and ultrasonographic sonoelastography offer objective insights into post-stroke spasticity.
• These novel measurement tools show potential for accurate spasticity assessment.
• Further research is needed to refine these techniques for clinical application in spasticity management.