中国组织工程研究

中国组织工程研究 ›› 2011, Vol. 15 ›› Issue (52): 9701-9708.doi: 10.3969/j.issn.1673-8225.2011.52.003

• 骨科植入物 orthopedic implant • 上一篇    下一篇

钢板长度对钢板螺钉内固定结构刚度的影响

杭海峰1，刘  璠2   

  1. 1江都市人民医院骨科，江苏省江都市  225200
    2南通大学附属医院骨科，江苏省南通市  226001
  • 收稿日期:2011-06-18 修回日期:2011-10-20 出版日期:2011-12-24 发布日期:2011-12-24
  • 通讯作者: 刘璠，博士，主任医师，教授，博士生导师，南通大学附属医院骨科，江苏省南通市 226001
  • 作者简介:杭海峰★，男，1981年，江苏省江都市人，汉族，2009年南通大学毕业，硕士，医师，主要从事关节与创伤研究。 haifeng9.30@163.com

Effect of plate length on the stiffness of plate and screw fixation structure

Hang Hai-feng1, Liu Pan2   

  1. 1Department of Orthopedics, Jiangdu People’s Hospital, Jiangdu  225200, Jiangsu Province, China
    2Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong  226001, Jiangsu Province, China
  • Received:2011-06-18 Revised:2011-10-20 Online:2011-12-24 Published:2011-12-24
  • Contact: Liu Pan, Doctor, Chief physician, Professor, Doctoral supervisor, Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China
  • About author:Hang Hai-feng★, Master, Physician, Department of Orthopedics, Jiangdu People’s Hospital, Jiangdu 225200, Jiangsu Province, China haifeng9.30@163.com

PDF

312

被引次数

5

摘要：

背景：目前在骨折内固定过程中，一定螺钉数量及分布的情况下，不同钢板长度研究甚少，钢板过短，固定不牢，常导致内固定失败。
目的：通过垂直于钢板表面长轴方向的三点折弯实验，测试相同螺钉数量及分布情况下不同钢板长度的内固定应力变化。
方法：选取成人尸体胫骨标本30根，分成6组，每组5根，制成中段横行无缺损骨折模型，每组分别用四孔、六孔、八孔、十孔、十二孔、十四孔胫骨不锈钢有限接触动力加压钢板进行对称性固定，于钢板靠近骨折端最近两个螺孔及距离骨折端最远的两个螺孔固定螺钉，每组分别编号为A、B、C、D、E、F组。
结果与结论：在三点折弯实验中，A组中骨折端的平均应变最大，D组中骨折端的平均应变最小。A组中骨折端的平均应变与B、C、D、E、F组差异均有显著性意义(P < 0.05)；B组与C、D、E、F组平均应变差异有显著性意义(P < 0.05)，C组与D、E组平均应变差异有显著性意义(P < 0.05)，F组与D组平均应变差异有显著性意义(P < 0.05)。提示在三点折弯实验中，相同螺钉数量及分布情况下，钢板长度对钢板螺钉内固定结构系统的稳定性有明显影响。八孔及更长的钢板内固定有更好的弹性形变能力及稳定性。

关键词: 钢板长度, 动力加压钢板, 刚度, 螺钉, 三点折弯实验

Abstract:

BACKGROUND: Currently in the process of fracture fixation, studies on different plate lengths under a certain number and distribution of screws are few. When plate is too short, fixed plate is not strong, so which usually cause the failure of internal fixation.
OBJECTIVE: To detect the stress changes of different plant lengths under the same number and distribution of screws by three point bending test.
METHODS: Thirty tibial specimens in adult corpses were divided into six groups (five in each group) at random, each of which was cut transversely in the median for constructing non-defect fracture model. Every group was fixed symmetrically with four-hole, six-hole, eight-hole, ten-hole, twelve-hole, fourteen-hole limited contact dynamic compression plates (LC-DCP) separately and each plate was attached by four screws (two screws were the nearest to fracture and the others were the farthest from fracture). Groups were labeled as A, B, C, D, E, F groups orderly.
RESULTS AND CONCLUSION: In three-point bending test, the average strain of fracture site in the group A was maximal and in the group D was minimal. There was significant difference in the average strain of fracture site between the group A and the other five groups (P < 0.05). There was significant difference in the average strain of fracture site between the group B and the C, D, E, F groups (P < 0.05). There was significant difference in the average strain of fracture site between the group C and the D, E groups (P < 0.05). There was also significant difference in the average strain of fracture site between the D and F groups (P < 0.05). It is indicated that during three point bending test, the screw length has significant effect on the stiffness of the plate and screw structure under the same screw number and position. The 8-hole plates and those longer than 8 holes have better elastic deformation ability and stability.

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