Abstract
目的 分析外固定针结构与其拧入骨干时引起远侧皮质骨折间的关系.方法成人新鲜尸体胫骨11根,取包埋后胫骨中段为针拧入测试区,确定进针点和方向.按针尖、针杆直径及螺纹的不同,将固定e针分为4组(A、B、C、D).通过MTS机动力轴,在扳手上施以持续纵向压力100N,操作者以≤3Nm的扭矩顺时针以25～30圈/min拧入固定针.观察胫骨近、远侧皮质的骨折情况.结果①A组(直径6mm)与B组(直径5mm)非自攻型固定针间所致骨折发生率没有显著性差异(P＞0.05);②在螺距和直径相同前提下(C组与B组),自攻型较非自攻型针更易造成骨折(P＜0.05);③对于自攻型固定针,D组(螺距1mm)固定针较C组(螺距2mm)骨折几率显著性降低(P＜0.05);④远侧骨皮质较近侧骨皮质更易发生骨折(P＜0.05).结论自攻型外固定针拧入时易导致远侧骨皮质骨折,减少螺距和牙深可降低骨折发生率。
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