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【medical-news】插入温度对胸椎椎弓根螺钉拉出强
Tosun B, Snmazçelik T, Buluç L, Cürgül I, Sarlak AY
Department of Orthopaedics and Traumatology, School of Medicine, Kocaeli University, Turkey.
http://www.ncbi.nlm.nih.gov/sites/entrez
STUDY DESIGN: The axial pullout strength of pedicle screws that were at different temperatures when inserted was compared in calf vertebrae.
OBJECTIVE: To determine if insertional temperature of the screw itself affects pullout strength.
SUMMARY OF BACKGROUND DATA: Fixation stability of pedicle screws depend on several factors. The development of alternate insertion techniques and screw designs were used to improve the stability. Polymethylmethacrylate and calcium sulfate augmentation have been shown to be viable options for improving fixation; but have the potential disadvantages.
METHODS: Three cadaveric thoracic calf spines were instrumented between T1-T10 bilaterally with one type of pedicle screws stored at different insertional temperatures. The axial pullout tests were performed at cross head speed of 5 mm/min. Pullout loads and displacement were recorded at 1/20 seconds intervals until failure occurred.
RESULTS: The highest pullout force was obtained with the screws inserted at 4 degrees C. These screws had a 19% increase in pullout strength compared with the screws inserted at 24 degrees C. The highest force/torque proportion was gained in the same group as 0.30 kn/Nm.
CONCLUSION: The technique showed increased pullout force with the screws inserted at 4 degrees C. Using pedicle screws stored at 4 degrees C before instrumentation, seems reasonable in an attempt to obtain a better bone-screw interface.
本人已认领该文编译，48小时后若未提交译文，请其他战友自由认领。 Effect of Insertional Temperature on the Pullout Strength of Pedicle Screws Inserted Into Thoracic Vertebrae: An In Vitro Calf Study
Basic Science
插入温度对胸椎椎弓根螺钉拉出强度的影响：一项体外脊椎实验
基础科学
Abstract:
摘要：
Study Design. The axial pullout strength of pedicle screws that were at different temperatures when inserted was compared in calf vertebrae.
研究设计。不同温度椎弓根螺钉轴向拉出强度比较。
Objective. To determine if insertional temperature of the screw itself affects pullout strength.
目的：确定螺钉插入时的温度对其拉出强度是否具有影响。
Summary of Background Data. Fixation stability of pedicle screws depend on several factors. The development of alternate insertion techniques and screw designs were used to improve the stability. Polymethylmethacrylate and calcium sulfate augmentation have been shown to be viable options for improving fixation; but have the potential disadvantages.
背景数据概述：椎弓根螺钉固定的稳定性取决于几个因素。固定的稳定性可通过植入技术的发展和螺钉的设计得以改善。聚甲基丙烯酸甲酯和硫酸钙添加剂已被证明是可行的改善固定的方法，但都具有潜在的缺点。
Methods. Three cadaveric thoracic calf spines were instrumented between T1-T10 bilaterally with one type of pedicle screws stored at different insertional temperatures. The axial pullout tests were performed at cross head speed of 5 mm/min. Pullout loads and displacement were recorded at 1/20 seconds intervals until failure occurred.
方法：使用三具尸体的T1至T10节段的双侧胸椎进行研究，植入不同温度的同一种类椎弓根螺钉。使用十字头以5毫米/分钟的速度检测轴向拉出试验。每隔二十分之一秒记录拉出试验的拉出应力和移位情况，直至完全拉出。
Results：The highest pullout force was obtained with the screws inserted at 4[degrees]C. These screws had a 19% increase in pullout strength compared with the screws inserted at 24[degrees]C. The highest force/torque proportion was gained in the same group as 0.30 kn/Nm.
结果：4摄氏度植入的椎弓根螺钉组获得了最高的拉出应力，与24摄氏度植入的螺钉相比增加了19％。最大应力/扭矩比例也出现在4摄氏度植入组，为0.30 kn/Nm。
Conclusion. The technique showed increased pullout force with the screws inserted at 4[degrees]C. Using pedicle screws stored at 4[degrees]C before instrumentation, seems reasonable in an attempt to obtain a better bone-screw interface.
结论。该技术显示了在4摄氏度植入螺钉能够增加拉出应力。在植入椎弓根螺钉前将其保存在4摄氏度下似乎是一种非常合理的获得更佳骨-螺钉界面的方法。 编译：
植入温度对胸椎椎弓根螺钉拉出强度的影响：一项体外脊椎实验
基础科学
摘要：
研究设计。不同温度椎弓根螺钉轴向拉出强度比较。
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作者:admin@医学,生命科学 2011-03-06 17:11
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