What question did this study set out to answer?

This study aims to compare the biomechanical effectiveness of pedicle screws and cortical bone trajectory fixation in treating ankylosing spondylitis.

February 8, 2026European journal of medical research0 citationsOpen Access

Comparative biomechanical analysis of pedicle screws versus cortical bone trajectory fixation in the treatment of ankylosing spondylitis

YXYangyang XuChangzhi Medical College LZLe ZhangBay Area Hospital GWGuoqiang WeiChangzhi Medical College

Key Points

This study aims to compare the biomechanical effectiveness of pedicle screws and cortical bone trajectory fixation in treating ankylosing spondylitis.
Performed biomechanical testing under various conditions: flexion, extension, lateral bending, and rotation.
Compared strength of pedicle screws (PS) against cortical bone trajectory (CBT) fixation techniques.
Under flexion, extension, and lateral bending, pedicle screws demonstrated superior biomechanical strength.
Under rotation, cortical bone trajectory fixation showed better strength compared to pedicle screws.
Overall, pedicle screws effectively maintained spinal fusion stability post bone resection for ankylosing spondylitis.

Abstract

Under conditions of flexion, extension, and left and right lateral bending, the PS technique provided better biomechanical strength. Whereas, under conditions of left and right rotation, the CBT technique provided better biomechanical strength. Overall, compared to CBT, the current PS technique was sufficiently effective in maintaining spinal fusion stability after bone resection for AS.

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