Peripheral nerve involvement in spinal cord injury: an electromyographic study

Area of Science:

• Neurology
• Neurophysiology

Background:

• Paraplegia, resulting from spinal cord lesions, can manifest in spastic or flaccid forms.
• The role of the peripheral nervous system in the development of these paraplegia types is not fully understood.

Purpose of the Study:

• To assess the peripheral nervous system in patients with spastic and flaccid paraplegia using electromyography.
• To investigate the relationship between peripheral nerve function and paraplegia type.

Main Methods:

• Electromyographic (EMG) studies were conducted on twelve patients with paraplegia (8 spastic, 4 flaccid).
• Nerve conduction studies and analysis of denervation potentials were performed on the lower limbs.

Main Results:

• All patients exhibited electromyographic abnormalities, including denervation potentials, slowed nerve conduction, and nerve inexcitability.
• These findings suggest a diffuse peripheral neuropathy, potentially exacerbated by local pressure palsies.
• Peripheral nerve involvement was more evident in patients with flaccid paraplegia compared to the spastic group.

Conclusions:

• The peripheral nervous system appears to play a significant role in determining the clinical presentation of paraplegia after complete spinal cord lesions.
• A diffuse neuropathy of unknown etiology is suggested in paraplegic patients.
• Peripheral nerve dysfunction may be a key factor differentiating spastic from flaccid paraplegia.