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Internal morphology of human cervical pedicles
M M Panjabi1, E K Shin, N C Chen
1Biomechanics Research Laboratory, Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, CT 06520-8071, USA. manohar.panjabi@yale.edu
Spine
|May 12, 2000
Summary
The internal structure of cervical pedicles varies significantly, with medial walls being much thicker than lateral walls. The thinnest cortical bone is found at C7, crucial information for safe screw placement.
Area of Science:
- Spinal anatomy and biomechanics
- Orthopedic surgery research
- Radiographic imaging analysis
Background:
- Limited data exists on the internal architecture and cortical thickness of cervical pedicles.
- Previous studies focused primarily on external pedicle dimensions.
Purpose of the Study:
- To quantify internal dimensions and cortical shell thicknesses of middle and lower cervical pedicles.
- To provide detailed anatomical data for surgical planning.
Main Methods:
- Thin-sectioning and digitization of 25 human cervical vertebrae (C3-C7).
- Radiographic imaging and specialized software for measuring internal and external dimensions.
- Analysis of pedicle height, width, cortical shell thickness, and cancellous core dimensions.
Main Results:
- Medial cervical pedicle walls are significantly thicker (1.4-3.6 times) than lateral walls.
- Cortical shell thickness varied along the pedicle axis, with the thinnest overall at C7.
- Significant differences in cortical thickness were observed between vertebral levels.
Conclusions:
- Cervical pedicles possess complex, variable internal morphology.
- Understanding regional variations in cervical pedicle structure is essential for safe transpedicular screw fixation.
- Quantitative data on internal dimensions aids in surgical risk assessment.