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Dynamic canal encroachment during thoracolumbar burst fractures
1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
Journal of Spinal Disorders
|February 1, 1995
Summary
Dynamic spinal canal encroachment during trauma is significantly greater than static measurements. This finding helps explain the poor correlation between radiographic canal compromise and neurological deficits in burst fractures.
Area of Science:
- Orthopedics
- Spine Surgery
- Biomechanics
Background:
- Burst fractures often show poor correlation between neurological deficit and static canal encroachment.
- Understanding the dynamic nature of spinal canal compromise during trauma is crucial.
Purpose of the Study:
- To compare dynamic canal encroachment during trauma with static encroachment after trauma in thoracolumbar burst fractures.
Main Methods:
- Human cadaveric thoracolumbar spine specimens (T11-L1) were subjected to high-speed impact to create burst fractures.
- Dynamic canal encroachment was measured during impact using transducers.
- Static canal encroachment was measured post-trauma using radiographs and calibrated steel balls.
Main Results:
- Dynamic canal encroachment averaged 33.3% of canal diameter.
- Static canal encroachment averaged 18.0% of canal diameter.
- Dynamic encroachment was 85% greater than static encroachment.
Conclusions:
- Dynamic spinal canal encroachment during burst fractures is substantially larger than static measurements.
- This discrepancy may explain the poor correlation between radiographic findings and neurological deficits.
- Clinicians should be aware of the significant dynamic nature of canal compromise in burst fractures.