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Efficacy of variable-angle screws in transpedicular fixation.
P M Arnold1, R D Strang, D Roussel
1Section of Neurosurgery, University of Kansas Medical School, Kansas City, Kansas.
Neurosurgical Focus
|August 22, 2006
Summary
Variable-angle screws offer a safe and effective option for transpedicular fixation, particularly in complex spinal cases. This study found solid fusion in most patients, with no neurological decline, highlighting their utility in spinal fusion procedures.
Area of Science:
- Orthopedics
- Neurosurgery
- Spinal Surgery
Background:
- Transpedicular fixation is a common technique for spinal stabilization.
- Variable-angle screws offer potential advantages in screw placement and construct flexibility.
- Evaluating their efficacy in diverse spinal pathologies is crucial.
Purpose of the Study:
- To assess the usefulness and efficacy of variable-angle screws in posterior transpedicular fixation.
- To determine the fusion rates and complication profiles associated with this technique.
Main Methods:
- A prospective study involving 16 patients undergoing posterior transpedicular fixation with variable-angle screws.
- Patients presented with spinal instability, degenerative spondylosis, or metastatic disease.
- Postoperative follow-up included clinical assessment and serial radiography over 11-24 months.
Main Results:
- Solid fusion was achieved in 14 out of 16 patients.
- No wound infections or neurological decline were reported.
- Two early disconnections occurred due to technique errors, but no other construct failures were observed.
Conclusions:
- Variable-angle pedicle screws are a safe and useful adjunct for transpedicular fixation.
- They are particularly beneficial in multisegment fixation and cases with spinal malalignment.
- The flexibility in screw trajectory can decrease operating time.