椎弓根钝头钻的研制和实验应用

目的 设计一种新型椎弓根钝头钻．以期减少椎弓根螺钉植入的穿破率。方法选用7具成人胸腰段脊柱标本（T10～L5）。随机分为2组：对照组（n=49）：采用克氏针准备钉道，植入螺钉；实验组（n=49）：采用钝头钻准备钉道植入螺钉。术后解剖标本直视下观察椎弓根周壁，了解螺钉的穿破率。结果实验组49个椎弓根仅1例穿破（穿破率2．0％）；对照组8例穿破（穿破率16.0％），两组结果有显著性差异（P〈0．05）。结论应用新型钝头钻准备钉道，能明显降低下胸椎及腰椎椎弓根螺钉植入的穿破率。

Design of a Blunt-Tipped Drill of Pedicle Screw Placement and Its Cadaveric Study

Objective To design a blunt-tipped drill of pedicle screw placement,in order to decrease the accident of pedicle violations during pedicle screw placement.Methods Seven Low thoracic and lumbar spine specimens from T_(10) to L_5 were used for pedicle screw placement.Two techniques of transpedicular screw placement were used.For the conventional placement technique Kirschner wire and for the placements technique a blunt-tipped drill of pedicle screw placement was used.After screw placements,all specimens were dissected and confirmed by visual inspection any pedicle wall violation.Results In the group using the blunt-tipped drill of pedicle screw placement,one pediclar cortex was penetrated by screws(2.0%).In the group of the conventional placement technique,eight pediclar cortexes were penetrated by screws(16%).Conclusion In the group in which the conventional placement technique is used,there is a higher accident of pedicle violation.The blunt-tipped drill of pedicle screw placement will significantly enhance the successful rate.