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首页> 外文期刊>British journal of neurosurgery >Correlation between pedicle size and the rate of pedicle screw misplacement in the treatment of thoracic fractures: Can we predict how difficult the task will be?
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Correlation between pedicle size and the rate of pedicle screw misplacement in the treatment of thoracic fractures: Can we predict how difficult the task will be?

机译：胸椎骨折的椎弓根大小与椎弓根螺钉错位发生率之间的关系：我们能否预测这项工作的难度？

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Study Design. A retrospective study. Objective. To correlate the incidence of pedicle-screw (PS) misplacement with the dimensions of the pedicles in the treatment of thoracic spine fractures. Summary of background data. The technical challenge of internal fixation with PS in the thoracic spine has been well documented in the literature. However, there are no publications that document the correlation between the pedicle dimensions of the thoracic vertebrae in the preoperative computed tomography scans (CT) and the rate of PS misplacement. Methods. All patients who had PSs inserted between the T1 and T12 vertebrae during a 24-month period were included in this study. PS position was assessed on high quality CT scans by two independent observers and classified in 2 categories: correct or misplaced. The transverse diameter, craniocaudal diameter and cross-sectional area of the pedicles from T1 to T12 were measured in the pre-operative CT. Results. During the period of this study 36 patients underwent internal fixation with 218 PS. Of the 218 screws, 184 (84.5%) were correct and 34 (15.5%) were misplaced. Misplacement rate was 33% for pedicles with a transverse diameter less than 5 mm, 10.7% for those with a transverse diameter between 5 and 7 mm and 0% for those with a transverse diameter larger than 7 mm. There was a statistically significant difference in the rate of PS misplacement in pedicles with transverse diameter smaller than 5 mm compared with the others. Also, those with transverse diameter between 5.1 and 7 mm compared with those bigger than 7 mm in diameter. The rate of PS misplacement was higher between T3 and T9 (p < 0.05), which in turn correlated with pedicle transverse diameter. Conclusion. The rate of PS misplacement in the mid thoracic spine (T4-T9) is high and correlates with pedicle transverse diameter.
机译：学习规划。回顾性研究。目的。将椎弓根螺钉（PS）错位的发生率与椎弓根的尺寸相关联，以治疗胸椎骨折。背景数据摘要。文献已经充分证明了胸椎内固定PS的技术挑战。但是，没有出版物可以证明术前计算机断层扫描（CT）中胸椎椎弓根尺寸与PS错位率之间的相关性。方法。本研究包括所有在24个月内将PS插入T1和T12椎骨之间的患者。由两名独立的观察员通过高质量的CT扫描评估了PS的位置，并将其分为两类：正确或错误放置。在术前CT中测量T1到T12椎弓根的横径，颅尾径和横截面积。结果。在本研究期间，有36例患者接受了218 PS的内固定。在218颗螺丝中，有184颗（84.5％）正确，而34颗（15.5％）放错了位置。横向直径小于5毫米的椎弓根错位率为33％，横向直径在5到7毫米之间的错位率为10.7％，横向直径大于7毫米的错位率为0％。与其他相比，横向直径小于5 mm的椎弓根PS错放率有统计学差异。此外，与直径大于7毫米的那些相比，横向直径在5.1到7毫米之间的那些。 PS错位率在T3和T9之间较高（p <0.05），这与椎弓根横向直径相关。结论。胸椎中段（T4-T9）的PS错位率很高，并且与椎弓根横向直径相关。

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