形状记忆锯齿臂环抱内固定器的稳定性研究
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INVESTIGATION ON STABILITY OF SHAPE MEMORY SAWTEETHARM EMBRACING INTERNAL FIXATOR
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    摘要:

    本文采用52根犬股骨作中段截骨,分别以新设计的形状记忆锯齿臂环抱内固定器、接骨板和髓内钉进行固定。然后对三种固定方法对固定骨段的应力遮挡率、不同加载方向的弯曲强度和扭转强度进行测试。试验证实环抱器有良好的抱持力,固定后其抗弯强度与接骨板无明显差异,而其应力遮挡率却明显低于接骨板(p<0.01),同时抗扭作用又明显高于髓内钉(p<0.01)。上述结果提示,环抱器可在对骨折提供可靠固定的同时,避免接骨板所致的应力遮挡性骨质疏松,具备髓内钉所没有的良好抗扭能力,并在安放时不损伤髓内血供和骨膜,具有良好的应用前景。

    Abstract:

    Transverse osteotomy was performed at the middle of each of 52 dog femur.and then fixed pespectively with shape memory sawteeth-arm embracing internal fixator,bone plate and intramedullary nail.The stress shielding rate,bending strength of different directions and torsion strength of the three different fixation methods were measured and compared.The embracing force of the embracing fixtor was found to be high enough,so that the bending force between the embracing fixatorgroup and bone plate group showed no significant difference.But thestress shielding rate of the embracing fixation group was much lower than that of the bone plate group(p<0.01).While the torsion strength of the embracing fixator group was significantly higher than that of intramedullary nail group(p<0.01),The results showed that the embracing fixtor to provide reliable fracture fixation, and prevent osteoporosis caused by stress shielding of bone plate.The embracing fixator also has a good property in the resistance to torsion which is less than that in case of intramedullary nailing fixation, and does not induce further damage to the intramedullary circulation.

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祖晓水,戴克戎,吴小涛,徐秀林,薛文东.形状记忆锯齿臂环抱内固定器的稳定性研究[J].医用生物力学,1995,10(2):102-108

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