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  • 标题:Biomechanical study of the funnel technique applied in thoracic pedicle screw replacement
  • 本地全文:下载
  • 作者:YJ Huang ; MX Peng ; SQ He
  • 期刊名称:African Health Sciences
  • 印刷版ISSN:1680-6905
  • 电子版ISSN:1729-0503
  • 出版年度:2014
  • 卷号:14
  • 期号:3
  • 页码:716-724
  • DOI:10.4314/ahs.v14i3.30
  • 语种:English
  • 出版社:Makerere University Medical School(Uganda)
  • 摘要:

    Background : Funnel technique is a method used for the insertion of screw into thoracic pedicle. Aim : To evaluate the biomechanical characteristics of thoracic pedicle screw placement using the Funnel technique, trying to provide biomechanical basis for clinical application of this technology. Methods : 14 functional spinal units (T6 to T10) were selected from thoracic spine specimens of 14 fresh adult cadavers, and randomly divided into two groups, including Funnel technique group (n=7) and Magerl technique group (n=7). The displacement-stiffness and pull-out strength in all kinds of position were tested and compared. Results : Two fixed groups were significantly higher than that of the intact state (P<0.05) in the spinal central axial direction, compression, anterior flexion, posterior bending, lateral bending, axial torsion, but there were no significant differences between two fixed groups (P>0.05). The mean pull-out strength in Funnel technique group (789.09±27.33) was lower than that in Magerl technique group (P<0.05). Conclusions : The Funnel technique for the insertion point of posterior bone is a safe and accurate technique for pedicle screw placement. It exhibited no effects on the stiffness of spinal column, but decreased the pull-out strength of pedicle screw. Therefore, the funnel technique in the thoracic spine affords an alternative for the standard screw placement.

    Keywords : Thoracic; Pedicle screws; Biomechanics; Funnel technique

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