中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (48): 7765-7769.doi: 10.3969/j.issn.2095-4344.2015.48.010

• 脊柱植入物 spinal implant • 上一篇    下一篇

不同角度置钉对椎弓根螺钉稳定性的影响

庞仲辉1,刘 淼2,张亚斌1,姚永峰1,裴少琨1   

  1. 1陕西省第四人民医院骨科,陕西省西安市 710043;2西安市交大第一附属医院骨科,陕西省西安市 710056
  • 收稿日期:2015-10-28 出版日期:2015-11-26 发布日期:2015-11-26
  • 通讯作者: 庞仲辉,陕西省第四人民医院骨科,陕西省西安市 710043
  • 作者简介:庞仲辉,男,1972年生,陕西省西安市人,汉族,1995年安徽理工大学医学院毕业,主治医师。
  • 基金资助:

    陕西省科技攻关项目(2012K16-09-07)

Effect of different angles of implanted screws on the stability of pedicle screw

Pang Zhong-hui1, Liu Miao2, Zhang Ya-bin1, Yao Yong-feng1, Pei Shao-kun1   

  1. 1Department of Orthopedics, the Fourth People’s Hospital of Shaanxi, Xi’an 710043, Shaanxi Province, China; 2Department of Orthopedics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710056, Shaanxi Province, China
  • Received:2015-10-28 Online:2015-11-26 Published:2015-11-26
  • Contact: Pang Zhong-hui, Department of Orthopedics, the Fourth People’s Hospital of Shaanxi, Xi’an 710043, Shaanxi Province, China
  • About author:Pang Zhong-hui, Attending physician, Department of Orthopedics, the Fourth People’s Hospital of Shaanxi, Xi’an 710043, Shaanxi Province, China
  • Supported by:

    Tissue Engineering; Spine; Pedicle; Screws
    Funding: the Scientific and Technological Projects of Shaanxi Province, China, No. 2012K16-09-07

摘要:

背景:有研究表明经皮椎弓根螺钉置入的准确性及手术效果要优于开放手术,但既往研究中对置钉角度与螺钉稳定性的关系尚不清楚。
目的:观察不同角度置钉对椎弓根螺钉稳定性的影响。
方法:选取成年猪椎体标本30个,分别按照不同的冠状面及矢状面角度置钉,通过机器测试各标本螺钉的最大拔出力,并绘制载荷-位移曲线,进行统计分析。
结果与结论:10°及15°冠状面及矢状面角度置钉的螺钉最大拔出力及最大能量明显优于0°角组(P < 0.05)。当应力超出最大拔出力时,螺钉的拔出力呈现缓降趋势,冠状面及矢状面10°及15°夹角组曲线相似,斜率优于0°角组(P < 0.05)。结果证实,置钉角度为经皮椎弓根螺钉稳定性提供有力帮助,螺钉开始松动后,把持力呈现稳步下降趋势。 

关键词: 骨科植入物, 脊柱植入物, 椎体骨折, 椎弓根, 螺钉, 角度, 冠状面角, 矢状面角, 稳定性, 拔出力, 载荷-位移, 微创

Abstract:

BACKGROUND: Some studies have showed that the accuracy and surgery outcome of the percutaneous pedicle screw implantation was superior to open surgery, but the relationship between the angle of pedicle screws and screw stability is still unclear in previous studies.
OBJECTIVE: To investigate the effect of different angles of implanted screws on the stability of pedicle screw. 
METHODS: A total of 30 vertebral specimens of adult pigs were selected and screws were implanted respectively according to different coronal and sagittal angles. The maximum pull-out strength of screws from each specimen was tested by machine. Load-displacement curves were drew and statistically analyzed.
RESULTS AND CONCLUSION: The maximum pull-out strength and maximum energy of screw with 10° and  15° coronal and sagittal angles implantation were significantly better than those of 0° angle group (P < 0.05). When the stress exceeded the maximum pull-out strength, the pull-out strength of screw decreased gradually. The curves in coronal and sagittal 10° and 15° angle groups was similar, and the slope was better than 0° angle group (P < 0.05). These results confirm that the angle of the implanted screw provides effective assistance to the stability of percutaneous pedicle screw. After the looseness of the screws, the pullout strength shows a steady downward trend. 

 

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