【摘要】：目的 :評估新型微創(chuàng)椎弓根釘-板內(nèi)固定系統(tǒng)的生物力學強度。方法:根據(jù)美國材料測試協(xié)會(ASTM)標準構(gòu)建單釘-棒測試組件,在萬能材料試驗機上分別對微創(chuàng)椎弓根釘-板、單向椎弓根釘-棒和萬向椎弓根釘-棒組件進行生物力學強度測試。測試內(nèi)容包括靜態(tài)側(cè)壓測試和疲勞測試。在靜態(tài)側(cè)壓測試中使用6套組件,記錄組件屈服載荷、屈曲剛度以及失效模式。在疲勞測試中記錄完成250萬次循環(huán)負荷的最大應(yīng)力數(shù)值。結(jié)果:微創(chuàng)椎弓根釘-板組件的屈服載荷和屈曲剛度顯著低于單向椎弓根釘-棒組件(834.6±74.5N vs 1087.7±59.0N,218.1±22.4N vs 300.0±14.9N,P0.001)。微創(chuàng)椎弓根釘板組件的屈服載荷與萬向椎弓根釘-棒組件比較無顯著性差異(834.6±74.5N vs 762.8±88.6N,P=0.118);而釘-板組件的剛度顯著低于萬向釘-棒組件(218.1±22.4N/mm vs 389.5±37.2N/mm,P0.001)。單向椎弓根釘-棒組件的失敗模式為連接棒發(fā)生塑性形變,萬向椎弓根釘-棒組件為"球窩偶聯(lián)"結(jié)構(gòu)失效,微創(chuàng)椎弓根釘-板組件為鈦板的塑性形變和釘-板連接部位失效。在250萬次動態(tài)側(cè)壓疲勞測試中,單向椎弓根釘-棒組件、微創(chuàng)椎弓根釘-板組件和萬向椎弓根釘-棒組件分別在450N、450N和350N循環(huán)載荷下完成測試。結(jié)論:新型微創(chuàng)椎弓根釘-板內(nèi)固定系統(tǒng)可耐受250萬次450N循環(huán)載荷作用,同時具有高屈服載荷和低屈曲剛度的特點。
[Abstract]:Objective: to evaluate the biomechanical strength of a new minimally invasive pedicle screw-plate fixation system. Methods: according to the (ASTM) standard of the American Association of material testing, a single nail-bar test module was constructed, and the minimally invasive pedicle screw-plate was performed on a universal material testing machine. The biomechanical strength of unidirectional pedicle screw-rod and universal pedicle screw-rod assembly were measured. The test includes static lateral pressure test and fatigue test. Six sets of components were used to record the yield load, buckling stiffness and failure mode. The maximum stress values of 2.5 million cycles were recorded in fatigue test. Results: the yield load and buckling stiffness of minimally invasive pedicle screw plate assembly were significantly lower than that of unidirectional pedicle screw rod assembly (834.6 鹵74.5 N vs 1087.7 鹵59.0 N vs 218.1 鹵22.4 N vs 300.0 鹵14.9 Nu P0.001). There was no significant difference between the yield load of the minimally invasive pedicle screw plate assembly and that of the universal pedicle screw rod assembly (834.6 鹵74.5 N vs 762.8 鹵88.6 NV P0. 118), but the stiffness of the nail-plate assembly was significantly lower than that of the universal screw rod assembly (218.1 鹵22.4N/mm vs 389.5 鹵37.2 NmmP0.001). The failure mode of unidirectional pedicle screw-rod assembly is plastic deformation of the connecting rod, the failure of the universal pedicle screw-rod assembly is "ball socket coupling" structure, and the minimally invasive pedicle screw-plate assembly is the plastic deformation of titanium plate and the failure of nail-plate connection In 2.5 million dynamic lateral compression fatigue tests, the unidirectional pedicle screw-rod assembly, the minimally invasive pedicle screw-plate assembly and the universal pedicle screw-bar assembly were tested under 450 N and 350 N cyclic loads, respectively. Conclusion: the new minimally invasive pedicle screw plate fixation system can withstand 2.5 million times of 450N cyclic loading and has the characteristics of high yield load and low buckling stiffness.
【作者單位】： 第三軍醫(yī)大學附屬新橋醫(yī)院骨科;
【基金】：國家科技攻關(guān)計劃(2012BAI14B00) 重慶市科委重大專項資助項目(CSTC2012gg_yyjs B10012)
【分類號】：R318.01;R687.3

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