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Changes in the evoked spinal cord potentials associated with chronic experimental cord compression
1Department of Orthopaedic Surgery, Nagoya University School of Medicine, Japan.
Spine
|November 1, 1991
Summary
Chronic spinal cord compression, even mild, causes significant functional changes. Evoked spinal cord potentials detect these changes before paralysis or tissue damage, aiding early diagnosis.
Area of Science:
- Neurology
- Spinal Cord Injury Research
- Biomedical Engineering
Background:
- Chronic spinal cord compression is a significant clinical issue.
- Ossification of the ligamentum flavum (OLF) is a common cause of chronic spinal cord compression.
- Understanding early functional changes is crucial for timely intervention.
Purpose of the Study:
- To investigate the functional alterations in the early stages of chronic spinal cord compression.
- To establish a rabbit model of OLF for studying chronic cord compression.
- To correlate electrophysiological changes with histological findings.
Main Methods:
- Created an OLF model in rabbits using bone morphogenetic protein.
- Monitored evoked spinal cord potentials (ESCPs).
- Performed myelography, ESCP measurements, and histological examinations on 16 OLF rabbits and 6 controls.
Main Results:
- Mild chronic compression caused greater ESCP alterations than acute compression.
- Dorsal compression led to injury in the dorsal and dorsolateral columns.
- ESCP changes were observed before the onset of paralysis and histological damage.
Conclusions:
- Evoked spinal cord potentials are sensitive indicators of early functional deficits in chronic spinal cord compression.
- The OLF rabbit model effectively mimics human chronic cord compression.
- Electrophysiological monitoring can precede clinical and pathological signs of spinal cord injury.