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Lumbar pedicle: surgical anatomic evaluation and relationships
1Department of Neurosurgery, Faculty of Medicine, University of Ankara, Ankara, Turkey. ayhanattar@hotmail.com
Summary
This study analyzed lumbar pedicle anatomy to guide safe transpedicular screw fixation. Avoiding medial and inferior screw placement is crucial to prevent neural structure injury during lumbar spine surgery.
Area of Science:
- Spine anatomy
- Surgical anatomy
- Orthopedic surgery
Background:
- Transpedicular screw fixation is a common lumbar spine surgery technique.
- Limited anatomic data exists on lumbar pedicles and adjacent neural structures.
- Accurate screw placement is vital for surgical success and patient safety.
Purpose of the Study:
- To investigate the detailed anatomy of the lumbar pedicle.
- To define relationships between the pedicle and adjacent neural structures.
- To provide critical anatomic data for safe transpedicular screw fixation in the lumbar spine.
Main Methods:
- Anatomic dissection of 20 human cadavers.
- Exposure and measurement of lumbar pedicle dimensions and surrounding neural structures.
- Quantification of pedicle width, height, interpedicular distance, and distances to nerve roots and dural sac.
Main Results:
- Average distances from pedicles to superior nerve roots, inferior nerve roots, and dural sac ranged from 2.9-6.2 mm, 0.8-2.8 mm, and 0.9-2.1 mm, respectively.
- Mean pedicle height and width varied across lumbar levels (L1-L5).
- Interpedicular distance increased caudally, while root exit angle showed a slight increase.
Conclusions:
- The study provides precise measurements of lumbar pedicle anatomy and its relationship to neural elements.
- Findings highlight the importance of avoiding medial and inferior pedicle screw misplacement.
- This anatomic data is essential for enhancing the safety and efficacy of lumbar transpedicular screw fixation.