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An anatomic basis for spinal instability: a porcine trauma model
T R Oxland1, M M Panjabi, E P Southern
1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut 06510.
Summary
Specific ligament and bone injuries in the cervical spine directly predict multidirectional instability. Understanding these anatomic correlations is key for diagnosing and treating spinal trauma effectively.
Area of Science:
- Orthopedics
- Spinal Surgery
- Biomechanics
Background:
- Spinal instability is a significant clinical challenge.
- Identifying the precise anatomic basis of spinal instability is crucial for effective treatment.
- Porcine cervical spine models offer a relevant platform for studying spinal trauma.
Purpose of the Study:
- To elucidate the specific anatomical structures and columns responsible for multidirectional cervical spine instabilities.
- To correlate distinct anatomical injuries with specific types of spinal instability following trauma.
Main Methods:
- 16 porcine cervical spine specimens were subjected to controlled sagittal plane trauma.
- Multidirectional instability was quantified before and after trauma.
- Detailed anatomic dissections identified and quantified injuries to specific structures and columns.
- Multiple regression models analyzed correlations between injuries and instabilities.
Main Results:
- Flexion instability strongly correlated with interspinous/supraspinous ligament and ligamentum flavum injury.
- Extension instability linked to anterior longitudinal ligament and pedicle damage.
- Axial rotation instability associated with anterior disc-end-plate and capsular ligament injuries.
- Lateral bending instability correlated with posterior disc-end-plate injuries.
- Individual structural injuries showed stronger correlations with instability than broader column classifications.
Conclusions:
- Specific ligamentous and bony injuries are direct predictors of multidirectional cervical spine instability.
- Anatomical structural injuries provide more precise correlations with instability than generalized column injuries.
- These findings enhance understanding of the biomechanical basis of spinal trauma and instability.