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磷酸钙骨水泥强化和修复椎弓根螺钉的生物力学研究 被引量:6

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摘要 目的:评价磷酸钙骨水泥(calcium phosphate cement,CPC)强化和修复椎弓根螺钉的生物力学效果。方法:6具新鲜成人尸体T11-L4共36个椎体,随机选取共中32个,分为4组(A,B,C,D),每组8个。A组:随机选择一侧椎弓根置入直径为6.5mm的椎弓根螺钉,另一侧以直径为3.5mm的钻头导孔,均不穿透椎体前侧骨皮质。在材料实验机上进行轴向拔出实验,拔出速率为5mm/min。然后向两侧椎弓根孔道注入配制好的磷酸钙骨水泥3-5ml,植入与前相同的椎弓根螺钉,体温下(37℃)放置24h后,再行前述拔出实验。B组:应用聚甲基丙烯酸甲酯(PMMA)进行修复和强化,作为对照。结果:CPC对照组拔出力为(826.8±171.0)N,修复组为(1430.3±278.4)N,强化组为(1452.7±288.3)N;PMMA对照组拔出力为(839.7±181.1)N,修复组为(1846.2±342.1)N,强化组为(1946.9±359.4)N。CPC骨水泥强化组和修复组拔出力明显高于对照组,差异具有非常显著性意义(P<0.05),但分别小于PMMA强化组和修复组。周期抗屈实验中,添加CPC可使椎弓根螺钉在同等负荷(200N,800个周期)下仅产生较小的位移,但强化效果不及PMMA。结论:在植入椎弓根螺钉时添加具有生物活性的磷酸钙骨水泥可显著提高其初始稳定性,虽其强化效果不及PMMA,但其潜在的开发前景已经使PMMA的临床应用受到了极大的挑战。
出处 《医学临床研究》 CAS 2002年第5期325-330,共6页 Journal of Clinical Research
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参考文献19

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