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Vertebral burst fractures: an experimental, morphologic, and radiographic study
B E Fredrickson1, W T Edwards, W Rauschning
1Department of Orthopedic Surgery, SUNY Health Science Center, Syracuse.
Spine
|September 1, 1992
Summary
Spinal burst fractures, often causing spinal cord injury, are difficult to treat. New research clarifies how distraction forces reduce intracanal fragments, improving treatment strategies for these complex vertebral injuries.
Area of Science:
- Orthopedics
- Biomechanics
- Spinal Surgery
Background:
- Spinal burst fractures result from rapid compressive loading, potentially causing spinal cord injury.
- These fractures are challenging to treat due to poorly understood biomechanics of reduction.
- The mechanism of distraction force transmission to intracanal fragments requires further investigation.
Purpose of the Study:
- To develop a reproducible in vitro model for spinal burst fractures.
- To investigate the biomechanics of spinal burst fracture reduction.
- To elucidate the mechanism of indirect reduction of intracanal fragments.
Main Methods:
- Created reproducible spinal burst fractures in vitro.
- Examined pathologic anatomy via gross structure and microtome sections.
- Utilized magnetic resonance imaging (MRI) to confirm fiber mechanics.
- Tested forces required for fragment reduction using segmental fixation devices.
Main Results:
- Fractures mimicked clinical observations.
- Extensive damage to adjacent discs (superior and inferior) was noted.
- Anular fibers of the superior vertebra were identified as key in reducing intracanal fragments.
- Distraction forces were found to be predominant for indirect posterior reduction.
Conclusions:
- The study clarifies the biomechanics of spinal burst fracture reduction.
- Anular fibers play a crucial role in reducing intracanal fragments, more so than the posterior longitudinal ligament.
- Uniform distraction forces are most effective for posterior reduction of intracanal fragments.