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Corticospinal excitability in patients with unilateral sciatica.
Paul H Strutton1, Maria Catley, Alison H McGregor
1Department of Sensorimotor Systems, Division of Neuroscience and Psychological Medicine, Faculty of Medicine, Imperial College London, Charing Cross Campus, London W6 8RP, UK. p.strutton@imperial.ac.uk
Neuroscience Letters
|December 4, 2003
Summary
Sciatica patients show reduced corticospinal drive to leg muscles, potentially easing pain. This nerve signal reduction correlates with disability, suggesting a protective mechanism against chronic sciatica symptoms.
Area of Science:
- Neuroscience
- Neurology
- Musculoskeletal Disorders
Background:
- Sciatica can alter neural pathways controlling leg muscles.
- Chronic pain may impact motor cortex excitability.
Purpose of the Study:
- To investigate changes in corticospinal excitability in sciatica patients.
- To correlate these neurophysiological changes with pain and disability.
Main Methods:
- Electromyography (EMG) and transcranial magnetic stimulation (TMS) were used.
- Motor evoked potentials (MEPs) and silent periods were measured bilaterally in tibialis anterior and lateral gastrocnemius muscles.
- Nine sciatica patients and seven healthy controls participated.
Main Results:
- Sciatica patients exhibited higher MEP thresholds and longer silent periods compared to controls.
- A positive correlation was found between Oswestry Disability Index scores and MEP thresholds/silent periods.
- These findings indicate reduced corticospinal excitability in sciatica.
Conclusions:
- Chronic sciatica pain may lead to decreased corticospinal drive to leg muscles.
- This reduction might be a protective mechanism to relax muscles near the pain site.
- Further research is needed to determine if these changes are reversible with treatment.