改进型耻骨联合分离记忆合金内固定器的生物力(4)

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背景：记忆合金自身具有独特形状记忆性能及良好的组织相容性，目前被制作成各种内固定器广泛用于微动关节及骨折部位的手术治疗。

目的：探究改进型耻骨联合分离记忆合金内固定器的生物力学特性。

方法：取10 具成人骨盆标本，建立耻骨联合分离损伤模型，随机分2 组固定：观察组复位后以改进型耻骨联合分离记忆合金内固定器固定，对照组复位后以动力加压钢板固定，采用万能生物材料试验机进行生物力学测试，记录耻骨联合水平、前后与垂直方向的相对位移。

结果与结论：①两组模型均无松动及内固定断裂；②不同载荷下观察组水平方向的位移均小于对照组(P＜0.05)；③不同载荷下观察组前后方向的位移均小于对照组(P＜0.05)；④不同载荷下观察组垂直方向的位移均小于对照组(P＜0.05)；⑤结果表明，改进型耻骨联合分离记忆合金内固定器对抗水平及前后方向的拉力优于动力加压钢板，对抗垂直剪切力优于动力加压钢板。

BACKGROUND:The memory alloy itself has unique shape memory properties and excellent histocompatibility，which is currently made into various internal fixators widely for the surgical treatment of the fretting joint and the fracture site.

OBJECTIVE:To investigate the biomechanical characteristics of the modified memory alloy internal fixator for separation of pubic symphysis.

METHODS:Models of pubic symphysis separation injury were established in 10 pelvic specimens and randomly divided into two groups for in the observation group were fixed with the modified memory alloy internal fixator for separation of pubic symphysis after models in the control group were fixed with dynamic compression plate after universal biomaterial testing machine was used for biomechanical horizontal，anteroposterior and vertical displacements of the pubic symphysis were recorded.

RESULTS AND CONCLUSION:(1) There was no loosening or fracture of internal fixation in both groups.(2) The horizontal displacement of the observation group was smaller than that of the control group under different loads (P＜0.05).(3) The anteroposterior displacement of the observation group was smaller than that of the control group under different loads (P＜0.05).(4) The vertical displacement of the observation group was smaller than that of the control group under different loads (P＜0.05).(5) The experimental results show that the tensile force of the modified memory alloy internal fixator for separation of pubic symphysis against horizontal and anteroposterior directions is better than that against dynamic compression plate，which resistance to vertical shear force is better than that of dynamic compression plate.

文章来源：《工程力学》 网址: http://www.gclxzz.cn/qikandaodu/2021/0320/680.html