腰椎弓根螺钉进钉点和一次置钉率的研究

目的 探讨不同的置钉方法对腰椎弓根进钉点定位和一次置钉的影响。方法 分析105例患者共462个椎弓根螺钉的内固定应用情况，比较5种定位方法一次置钉成功率的差异。结果 462例均安全地置入椎弓根螺钉，术后X片显示螺钉位于椎弓根中部322例，位于椎弓根下部58例，位于椎弓根上部82例。四象限定位法置钉一次成功率达86．9％，同其他4种定位法比较有显著性差异（P〈0.01）。结论 四象限定位椎弓根点定位准确，显露容易，是一种简单、有效、实用的进钉方法。

Study on Locating the Entrance Spot of Pedicle of Lumbar Vertebra and the Successful Rate of Placement Nail One Time

Objective To explore the effects of various location methods on the successful rate of placement nails by the entrance spot of lumbar vertebra pedicle. Methods The clinical data of 105 patients with 462 times of internal nail fixation of lumbar vertebra pedicle were analyzed, and the successful rates of placement nails one time were compared among 5 location methods. Results 462 times of internal nail fixation of lumbar vertebral pedicle were performed safely. Postoperative X-ray imagining showed that 322 nails were located in the middle of pedicle of lumbar vertebra, 58 nails in its inferior part, and 82 nails in its superior part. The successful rate of placement nails one time by the location method of four quadrants technique was 86.9%, which was significantly different compared with the other 4 location methods(P<0.01). Conclusion Four quadrants technique for locating the entrance spot of lumbar vertebral pedicle was accurate, and easy for exposure. It was a simple and effective method of locating the entrance spot of lumbar vertebra pedicle.