ArticleJournal of orthopaedic surgery and research2026
The effect of pedicle screw angle on stress distribution in lumbar spine fixation: an optimization approach based on finite element analysis.
Article in Journal of orthopaedic surgery and research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundPedicle screw fixation is widely used for lumbar spine stabilization, and technical parameters such as screw insertion angle may influence the biomechanical behavior of the implant-bone construct.
objectiveThis study aimed to evaluate the effect of different transverse pedicle screw insertion angles (25°, 30°, 35°, and 40°) on stress distribution in the L4-L5 segment using three-dimensional finite element analysis (FEA).
methodsA three-dimensional finite element model of the L4-L5 lumbar segment was developed from computed tomography data of a healthy adult subject. Titanium alloy (Ti-6Al-4 V) pedicle screws (6.5 mm diameter) were modeled at four predefined insertion angles. A 400 N axial compressive load was applied to simulate physiological loading conditions. Stress distributions were analyzed using von Mises criteria within the ANSYS Workbench environment.
resultsMaximum von Mises stress values varied across insertion angles. The highest stress (399.26 MPa) was observed at 25°, primarily at the screw head-rod junction and screw-bone interface. The lowest stress (297.86 MPa) was recorded at 40°. A decreasing trend in stress values was observed with increasing insertion angle.
conclusionPedicle screw insertion angle affects stress distribution in the L4-L5 segment. Higher insertion angles were associated with lower stress values, suggesting a potentially more favorable biomechanical environment. These findings indicate that insertion angle may be an important parameter in pedicle screw fixation planning.
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