• World Neurosurg · Aug 2024

    Anatomical parameters of percutaneous, minimally invasive, direct intralaminar pars screw fixation of spondylolysis.

    • Burhan Oral Güdü, Ahmet Levent Aydın, Necip Engin Mercan, Suna Dilbaz, Musa Çırak, Tunç Öktenoğlu, and Ali Fahir Özer.
    • Department of Neurosurgery, Medipol University Sefakoy Hospital, Istanbul, Turkey. Electronic address: burhan.gudu@medipol.edu.tr.
    • World Neurosurg. 2024 Aug 1; 188: e567e572e567-e572.

    ObjectiveTo investigate the anatomical parameters of the ideal screw trajectory for percutaneous intralaminar screw fixation of a pars defect in lumbar spondylolysis using computed tomography scans.MethodsUsing advanced radiological software, the ideal intralaminar screw trajectory was determined. The anatomical parameters of this trajectory were analyzed using a total of 80 single-level lumbar tomography scans in patients with spondylolysis at the lumbar 4 vertebrae and lumbar 5 vertebrae levels. The ideal intralaminar screw trajectory started from the inferolateral edge of the lamina and was between the intralaminar region, pars defect, and defective pars neck and pedicle. Along this trajectory, the skin-lamina distance, intralaminar screw length, isthmic lamina length and width, defective pars neck width, lateral entry distance of the screw to the center of the spinous process, and sagittal and coronal screw application angles were analyzed.ResultsWhen comparing the lumbar 4 vertebrae and lumbar 5 vertebrae parameters, the mean skin-to-lamina distances were 11-9 cm (P = 0.000), intralaminar screw lengths 3.5-3.6 cm (P = 0.067), isthmic lamina lengths 2-2 cm (P = 0.698), mid-lamina widths 1-1 cm (P = 0.941), defective pars neck widths 1-1 cm (P = 0.674), screw lateral entry distances according to the spinous process 1-1.5 cm (P = 0.000), sagittal screw angles 45°-45° (P = 0.870), and coronal screw angles 10°-20° (P = 0.000), respectively. There were no differences based on age and gender (P < 0.05).ConclusionsPercutaneous intralaminar rigid screw fixation of a pars defect in spondylolysis provides minimally invasive, low-profile instrumentation. In spondylolysis, a screw length of 3-4 cm and a screw diameter of 4-5 mm may be sufficient for pars fixation with intralaminar screws.Copyright © 2024 Elsevier Inc. All rights reserved.

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