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Published on: August 6, 2019
[Pullout resistance of conventional pedicle screw implantation in comparison to fluoroscopic computer-assisted
O Linhardt1, L Perlick, T Renkawitz
1Orthopädische Klinik der Universität Regensburg, Bad Abbach. o.linhardt@asklepios.de
Aim:
Aim of the study was to compare pullout resistance of pedicle screws after conventional and fluoroscopic computer-assisted implantation in the cadaveric thoracic and lumbar spine.
Methods:
Pedicle screws were inserted in a total of 10 vertebrae of different human specimens: 10 screws were placed using conventional technique (group 1) and 10 screws were inserted with fluoroscopic computer-assisted system contralaterally (group 2). Then pedicle screws were evaluated for biomechanical axial pullout resistance.
Results:
Mean pullout force was 232 N (range 60-600 N) in group 1 and 353 N (range 112-625 N) in group 2. The difference was significant (p=0,0425).
Conclusion:
Fluoroscopic navigated implantation of pedicle screws increases the pullout strength in thoracic and lumbar cadaveric spines as compared with conventional methods.
