中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (36): 5764-5767.doi: 10.3969/j.issn.2095-4344.2908

• 骨与关节生物力学 bone and joint biomechanics • 上一篇    下一篇

改进型耻骨联合分离记忆合金内固定器的生物力学特征

周  君,宫玉锁,李盛华,朱艳国   

  1. 甘肃省中医院,甘肃省兰州市  730050
  • 收稿日期:2020-02-10 修回日期:2020-02-15 接受日期:2020-04-03 出版日期:2020-12-28 发布日期:2020-10-27
  • 通讯作者: 周君,主治医师,甘肃省中医院,甘肃省兰州市 730050
  • 作者简介:周君,男,1981年生,甘肃省环县人,汉族,硕士,主治医师,主要从事复杂骨与关节疾病及骨髓炎中西医治疗方面的研究。
  • 基金资助:
    兰州市科技局人才创新创业项目(2017-RC-58)

Biomechanical characteristics of the modified memory alloy internal fixator for separation of pubic symphysis

Zhou Jun, Gong Yusuo, Li Shenghua, Zhu Yanguo   

  1. Gansu Provincial Hospital of TCM, Lanzhou 730050, Gansu Province, China
  • Received:2020-02-10 Revised:2020-02-15 Accepted:2020-04-03 Online:2020-12-28 Published:2020-10-27
  • Contact: Zhou Jun, Attending physician, Gansu Provincial Hospital of TCM, Lanzhou 730050, Gansu Province, China
  • About author:Zhou Jun, Master, Attending physician, Gansu Provincial Hospital of TCM, Lanzhou 730050, Gansu Province, China
  • Supported by:

    the Talent Innovation and Entrepreneurship Project of Lanzhou Science and Technology Bureau, No. 2017-RC-58

摘要:

文题释义:

形状记忆合金:是一种在加热升温后能完全消除其在较低温度下发生的变形,恢复其变形前原始形状的合金材料,即拥有记忆效应的合金。形状记忆合金之所以具有变形恢复能力,是因为变形过程中材料内部发生的热弹性马氏体相变。目前常用的记忆合金为镍-钛合金。形状记忆合金在生物工程、医药、能源和自动化等方面也都有广阔的应用前景。

耻骨联合分离指骨盆前方两侧耻骨纤维软骨联合处,因外力而发生微小的错移,当分离2.5 cm时,临床常表现为耻骨联合处疼痛,有明显压痛,不能下地负重行走,患肢外展及跨步困难,骨盆挤压分离试验阳性。如果处理不当或不及时,大多数情况可能会遗留耻骨联合功能性疼痛或严重影响骨盆生物力学性能。

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。

ORCID: 0000-0002-5253-9353(周君)

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱;骨折;内固定;数字化骨科;组织工程

关键词: 骨, 植入物, 内固定, 记忆合金, 固定, 钢板, 力学, 生物力学

Abstract:

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 fixation. Models in the observation group were fixed with the modified memory alloy internal fixator for separation of pubic symphysis after reduction. The models in the control group were fixed with dynamic compression plate after reduction. A universal biomaterial testing machine was used for biomechanical testing. The 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.

Key words: bone, implants, internal fixation, memory alloy, fixation, steel plate, mechanics, biomechanics

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