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Chronic nerve root compression. Pathophysiologic mechanism of nerve root dysfunction
H Yoshizawa1, S Kobayashi, T Morita
1Department of Orthopaedic Surgery, Fujita Health University School of Medicine, Aichi, Japan.
Spine
|February 15, 1995
Summary
Chronic nerve root compression in dogs causes edema due to blood-nerve barrier changes, leading to nerve dysfunction. This study details the pathophysiologic changes over 12 months.
Area of Science:
- Neurology
- Pathophysiology
- Spinal Cord Research
Background:
- Chronic nerve root compression is a common cause of neurological deficits.
- Understanding the underlying pathophysiologic mechanisms is crucial for effective treatment.
Purpose of the Study:
- To investigate the pathophysiologic changes in spinal nerve roots subjected to chronic compression.
- To assess the role of the blood-nerve barrier in nerve root dysfunction.
Main Methods:
- Adult dogs underwent chronic compression of the seventh lumbar nerve root using a Silastic tube.
- Histologic, electrophysiologic, and blood-nerve barrier function studies were performed at various time points up to 12 months.
Main Results:
- Early findings included dural thickening and blood-nerve barrier alterations.
- Progressive loss of large myelinated fibers and increase in small fibers were observed.
- Nerve conduction velocity and compound action potential amplitude decreased over time, correlating with fiber loss.
Conclusions:
- Alteration of the blood-nerve barrier leads to intraradicular edema.
- Edema is identified as the primary factor in nerve root dysfunction resulting from chronic compression.