Morphometry of the Lumbar Pedicle: A Computed Tomography-Based Study with Implications for Pedicle Screw Fixation
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Abstract
Background: The pedicle is the densest and biomechanically strongest portion of the vertebra and the principal anchor for pedicle screw fixation; the safety of instrumentation depends on accurate knowledge of pedicle dimensions, which vary by vertebral level, sex and ethnicity.
Objective: To determine the morphometric parameters of the lumbar pedicles (L1–L5) using computed tomography (CT) and to assess their relevance to screw selection. Methods: A retrospective cross-sectional analysis of multidetector CT scans of 60 adults (600 pedicles) was performed. Transverse pedicle width (TPW), pedicle height (PH), transverse pedicle angle (TPA) and pedicle chord length were measured bilaterally from L1 to L5. Data were analysed using one-way ANOVA and t-tests (p < 0.05).
Results: TPW increased from 8.6 ± 1.3 mm at L1 to 16.2 ± 2.1 mm at L5, whereas PH decreased modestly from 15.1 to 13.8 mm. TPA increased progressively from 11.2° at L1 to 24.3° at L5, and chord length rose caudally. Male pedicles were significantly wider than female at every level (p < 0.05).
Conclusion: Lumbar pedicle width and medial angulation increase caudally while the pedicle is narrowest at L1–L2, where breach risk is highest. Preoperative CT-based planning and population-appropriate screw selection are essential.
Keywords
Lumbar pedicleMorphometryPedicle widthTransverse pedicle anglePedicle screw fixationComputed tomographyHow to Cite
Kumari, M., Bansal, M., Sinha, P., Usmani, Y., Tonk, G., & Prashant (2026). Morphometry of the Lumbar Pedicle: A Computed Tomography-Based Study with Implications for Pedicle Screw Fixation. International Journal of Medical and All Body Health Research, 7(3), 57-60. https://doi.org/10.54660/IJMBHR.2026.7.3.57-60
Kumari, Medha, et al. "Morphometry of the Lumbar Pedicle: A Computed Tomography-Based Study with Implications for Pedicle Screw Fixation." International Journal of Medical and All Body Health Research, vol. 7, no. 3, 2026, pp. 57-60. https://doi.org/10.54660/IJMBHR.2026.7.3.57-60.
Kumari, M., Bansal, M., Sinha, P., Usmani, Y., Tonk, G. and Prashant (2026) 'Morphometry of the Lumbar Pedicle: A Computed Tomography-Based Study with Implications for Pedicle Screw Fixation', International Journal of Medical and All Body Health Research, 7(3), pp. 57-60. doi: 10.54660/IJMBHR.2026.7.3.57-60.
Kumari M, Bansal M, Sinha P, Usmani Y, Tonk G, Prashant. Morphometry of the Lumbar Pedicle: A Computed Tomography-Based Study with Implications for Pedicle Screw Fixation. International Journal of Medical and All Body Health Research. 2026;7(3):57-60. doi:10.54660/IJMBHR.2026.7.3.57-60
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