CAJ | 학술논문

目的：观察椎弓根螺钉在相同水平角度（TSA 角为0°）、相同矢状角度（SSA 角为0°）不同深度时置入单个椎体对把持力的影响，为临床置钉提供理论依据。方法采用6个月龄猪 L2新鲜标本共16个椎体，将32侧椎弓根分4组，按不同深度分70％组、75％组、80％组、85％组分别置入椎弓根螺钉，自动记录仪记录下螺钉载荷-位移的变化曲线，测出最大轴向拔出力及最大拔出能量。结果80％组椎弓根螺钉最大拔出力及最大拔出能量明显大于70％组（P ＜0．05），75％组与85％组椎弓根螺钉的最大拔出力及最大拔出能量与70％组比较差异无统计学意义（P ＞0．05）。结论不同深度置钉对椎弓根螺钉的把持力随置钉深度的增加而逐渐增大。
목적：관찰추궁근라정재상동수평각도（TSA 각위0°）、상동시상각도（SSA 각위0°）불동심도시치입단개추체대파지력적영향，위림상치정제공이론의거。방법채용6개월령저 L2신선표본공16개추체，장32측추궁근분4조，안불동심도분70％조、75％조、80％조、85％조분별치입추궁근라정，자동기록의기록하라정재하-위이적변화곡선，측출최대축향발출력급최대발출능량。결과80％조추궁근라정최대발출력급최대발출능량명현대우70％조（P ＜0．05），75％조여85％조추궁근라정적최대발출력급최대발출능량여70％조비교차이무통계학의의（P ＞0．05）。결론불동심도치정대추궁근라정적파지력수치정심도적증가이축점증대。
Objective To discuss the biomechanics of holding force on the pedicle screws after the screws were in-serted into the pedicle of vertebral arch at same level angle(TSA angle was 0°),same sagittal angle (SSA angle was 0°)and different depth,and provide the basis for the clinical practice.Methods 16 new centrums(L2 )were adopt-ed from pig with six months.According to different depth,the pedicle of vertebral arch (32 sides)were selected into 4 groups:group of 70%,group of 75%,group of 80% and group of 85%.The changing curve of screw loading-dis-placement was recorded by automatic recording instrument.The maximum axial direction extraction force and extrac-ting energy were examined.Results The 80% group of pedicle screws maximum output and pull out energy was big-ger than 70% group(P <0.05),the 75% and 85% group of pedicle screws maximum output and pull out energy, were no statistically significant different compared with the 70% group(P >0.05).Conclusions When the screws are inserted into the pedicle of vertebral arch at different depth,the holding force will be increased as the depth aug-ment.