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首页> 外文期刊>Journal of orthopaedics and traumatology: official journal of the Italian Society of Orthopaedics and Traumatology >Supplemental S1 fixation for type C pelvic ring injuries: biomechanical study of a long iliosacral versus a transsacral screw
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Supplemental S1 fixation for type C pelvic ring injuries: biomechanical study of a long iliosacral versus a transsacral screw

机译：C型骨盆环损伤的辅助S1固定：长骨与经s骨螺钉的生物力学研究

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class="Heading">Background id="Par1" class="Para">A single iliosacral screw placed into the S1 vertebral body has been shown to be clinically unreliable for certain type C pelvic ring injuries. Insertion of a second supplemental iliosacral screw into the S1 or S2 vertebral body has been widely used. However, clinical fixation failures have been reported using this technique, and a supplemental long iliosacral or transsacral screw has been used. The purpose of this study was to compare the biomechanical effect of a supplemental S1 long iliosacral screw versus a transsacral screw in an unstable type C vertically oriented sacral fracture model. class="Heading">Materials and methods id="Par2" class="Para">A type C pelvic ring injury was created in ten osteopenic/osteoporotic cadaver pelves by performing vertical osteotomies through zone 2 of the sacrum and the ipsilateral pubic rami. The sacrum was reduced maintaining a 2-mm fracture gap to simulate a closed-reduction model. All specimens were fixed using one 7.0-mm iliosacral screw into the S1 body. A supplemental long iliosacral screw was placed into the S1 body in five specimens. A supplemental transsacral S1 screw was placed in the other five. Each pelvis underwent 100,000 cycles at 250?N, followed by loading to failure. Vertical displacements at 25,000, 50,000, 75,000, and 100,000 cycles and failure force were recorded. class="Heading">Results id="Par3" class="Para">Vertical displacement increased significantly (p??0.05) within each group with each increase in the number of cycles. However, there was no statistically significant difference between groups in displacement or load to failure. class="Heading">Conclusions id="Par4" class="Para">Although intuitively a transsacral screw may seem to be better than a long iliosacral screw in conveying additional stability to an unstable sacral fracture fixation construct, we were not able to identify any biomechanical advantage of one method over the other. class="Heading">Level of evidence id="Par5" class="Para">Does not apply—biomechanical study.
机译：class =“ Heading”>背景 id =“ Par1” class =“ Para”>将单个骨螺钉置入S1椎体中已显示出对某些C型骨盆环损伤不可靠。在S1或S2椎体中插入第二根辅助ac骨螺钉已被广泛使用。然而，已经报道了使用这种技术的临床固定失败，并且已经使用了补充的长骨或经s骨螺钉。这项研究的目的是在一个不稳定的C型垂直vertically骨骨折模型中比较补充S1长long骨螺钉和经trans骨螺钉的生物力学效果。 class =“ Heading”>材料和方法 id =“ Par2” class =“ Para”>在十个骨质疏松/骨质疏松的尸体中，通过ac骨第2区和同侧耻骨rami进行垂直截骨术，造成了C型骨盆环损伤。减少骨，保持2 mm的骨折间隙，以模拟闭合复位模型。使用一个7.0毫米骨螺钉将所有标本固定到S1主体中。在五个标本中，将一个附加的骨螺钉加长到S1体内。在另外五个中放置了一个trans骨S1辅助螺钉。每个骨盆在250？N的温度下进行100,000次循环，然后加载至失败。记录了在25,000、50,000、75,000和100,000次循环的垂直位移和破坏力。 class =“ Heading”>结果 id =“ Par3” class =“ Para”>垂直位移随着周期数的增加，各组内的显着增加（ p ？<？0.05）。但是，位移或破坏载荷在组之间没有统计学上的显着差异。 class =“ Heading”>结论 id =“ Par4” class =“ Para”>经s骨螺钉在向不稳定的construct骨骨折固定结构提供额外的稳定性方面似乎比长的ac骨螺钉更好，我们无法确定一种方法相对于另一种方法的任何生物力学优势。 class =“ Heading “>证据水平 id =” Par5“ class =” Para“>不适用于生物力学研究。

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