The Future of Upper Extremity Spasticity Management.

Area of Science:

• Neurosurgery
• Orthopedics
• Neuroscience

Background:

• Traditional upper limb spasticity surgery addresses downstream effects (muscle, tendon, joint).
• This approach often leads to unsatisfactory outcomes and relapse due to not addressing the underlying nerve pathology.
• A paradigm shift towards addressing the neuronal impulse pathway is needed.

Purpose of the Study:

• To investigate a novel surgical strategy for upper limb spasticity management.
• To explore the potential of reestablishing normal neuronal impulse pathways.
• To evaluate the efficacy of C7 nerve root transfer for spasticity reduction and functional restoration.

Main Methods:

• Identification and severance of the faulty gamma-neuronal circuit at the C7 spinal nerve root level.
• Transfer of the contralateral C7 nerve root to the injured C7 nerve root.
• Evaluation of spasticity reduction and functional recovery of reach and grasp.

Main Results:

• Severing the faulty gamma-neuronal circuit is hypothesized to reduce spasticity.
• C7 nerve root transfer shows potential for restoring upper limb extension.
• This technique may simultaneously improve reach and grasp functions.

Conclusions:

• A nerve-centric surgical approach targeting the C7 level offers a promising alternative for managing upper limb spasticity.
• Restoring the neuronal impulse pathway via C7 nerve transfer could provide a more durable solution than traditional methods.
• This strategy holds potential for significant functional improvement in patients with upper limb spasticity.