Biomechanic evaluation of screw pull-out strength on the axis of anterior transoralpharyngeal atlantoaxial reduction plate

TUN  Feng, YIN Qiang-Shui

Chinese Journal of Clinical Anatomy ›› 2010, Vol. 28 ›› Issue (5) : 575.

Chinese Journal of Clinical Anatomy ›› 2010, Vol. 28 ›› Issue (5) : 575.

Biomechanic evaluation of screw pull-out strength on the axis of anterior transoralpharyngeal atlantoaxial reduction plate

  • WU Feng ,YIN Qing-Shui
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Abstract

Objective To evaluate the transoral screw pull-out srength on C2 of transoralpharyngeal atlantoaxial reduction plate (TARP). Methods Six fresh spine specimens involving C1 and C2 (12 sides) were designed to compare screw pull-out strength  of C1 and C2. C1 screw was implanted into the lateral mass, while C2 screw was separately implanted into pedicle, vertebrae and articular process, and then the pull-out strength was tested and compared. Results There were no statistical difference of the screw pull-out strength between C1 lateral mass screw(546.45±85.07 N)and C2 pedicle screw(593.14±97.77 N),however, C1 lateral mass screw was stronger than C2 vertebrae screw and C2 screw underneath the articular process. The pull-out strength of C2 articular process screw(469.94±73.32N)was stronger than that of C2 vertebrae screw(395.15±75.07 N). Conclusions: Experimentally, screw fixation transoral approach to C2 pedicle and C2 articular process of TARP is strong and safe.

Key words

Axis; Screw; Pull-out strength; Biomechanics

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TUN  Feng, YIN Qiang-Shui. Biomechanic evaluation of screw pull-out strength on the axis of anterior transoralpharyngeal atlantoaxial reduction plate[J]. Chinese Journal of Clinical Anatomy. 2010, 28(5): 575

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