Insertional torque of the lumbar pedicle screw during surgery
Insertional torque of the lumbar pedicle screw during surgery
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DOI：
10.1007/s00776-004-0883-3
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发表时间：
2005-01-01
影响因子：
1.7
通讯作者：
Moriya, H
中科院分区：
文献类型：
--
作者：
Ozawa, T;Takahashi, K;Moriya, H
本研究的目的是确定椎弓根螺钉的术中插入扭矩是否与骨质疏松程度相关，以及插入扭矩是否可以作为老年患者螺钉松动和临床结果的预测指标。 25例患者行椎弓根螺钉内固定术。他们手术时的平均年龄为 72.2 岁（范围 65-79 岁）。平均随访期为 2.8 年（范围 1.0-4.8 年）。使用带有特殊连接器的观音型扭矩扳手测量椎弓根螺钉的插入扭矩。在本研究中，评估了 136 个螺钉。平均插入扭矩为 12.2 +/- 5.0 kgf (.) cm。发现插入扭矩与骨质疏松的等级之间存在负相关关系。 X 线照片显示 8 名患者的 18 个螺钉具有射线可透性。术后 6 个月就出现了射线可透性。然而，插入扭矩与螺钉松动的存在之间没有显着关系。此外，低插入扭矩患者和高插入扭矩患者的临床结果没有显着差异。这项研究表明，术中插入扭矩并不是螺钉松动或临床结果的客观预测因素。
The purposes of this study were to determine if the intraoperative insertional torque of pedicle screws correlates with the degree of osteoporosis and if insertional torque can be used as a predictor of screw loosening and clinical results in elderly patients. Pedicle screw fixation was performed in 25 patients. Their mean age at the time of surgery was 72.2 years (range 65-79 years). The mean follow-up period was 2.8 years (range 1.0-4.8 years). The insertional torque of the pedicle screws was measured using a Kannon-type torque wrench with a special connector. In the present study, 136 screws were evaluated. The mean insertional torque was 12.2 +/- 5.0 kgf (.) cm. A negative relation was found between insertional torque and the grade of osteoporosis. Roentgenograms showed the radiolucency of 18 screws in eight patients. Radiolucency appeared as early as 6 months postoperatively. However, there was no significant relation between insertional torque and the presence of screw loosening. Furthermore, there was no significant difference in the clinical results between patients with low insertional torque and those with high insertional torque. This study demonstrated that intraoperative insertional torque is not an objective predictor of screw loosening or clinical results.