中国组织工程研究 ›› 2015, Vol. 19 ›› Issue (26): 4180-4185.doi: 10.3969/j.issn.2095-4344.2015.26.016

• 脊柱植入物 spinal implant • 上一篇    下一篇

微创L5椎弓根钉进钉点的有效性分析

邓东海1,2,于滨生1,王文豪1,俞莉敏1,温  健1,马俊轩1,周  艺1   

  1. 1北京大学深圳医院脊柱外科,广东省深圳市  518036;2汕头大学医学院,广东省汕头市  515041
  • 收稿日期:2015-05-10 出版日期:2015-06-25 发布日期:2015-06-25
  • 通讯作者: 于滨生,博士,主任医师,北京大学深圳医院脊柱外科,广东省深圳市 518036
  • 作者简介:邓东海,男,1988年生,广东省高州市人,汉族,2015年汕头大学医学院毕业,硕士,主要从事脊柱外科方面的研究。

Effectiveness of L5 pedicle screw insertion with a minimally invasive method

Deng Dong-hai1, 2, Yu Bin-sheng1, Wang Wen-hao1, Yu Li-min1, Wen Jian1, Ma Jun-xuan1, Zhou Yi1   

  1. 1Department of Spine Surgery, Shenzhen Hospital, Beijing University, Shenzhen 518036, Guangdong Province, China; 2Shantou University Medical College, Shantou 515041, Guangdong Province, China
  • Received:2015-05-10 Online:2015-06-25 Published:2015-06-25
  • Contact: Yu Bin-sheng, M.D., Chief physician, Department of Spine Surgery, Shenzhen Hospital, Beijing University, Shenzhen 518036, Guangdong Province, China
  • About author:Deng Dong-hai, Master, Department of Spine Surgery, Shenzhen Hospital, Beijing University, Shenzhen 518036, Guangdong Province, China; Shantou University Medical College, Shantou 515041, Guangdong Province, China

摘要:

背景:在临床应用中,第5腰椎人字嵴结构不清,往往需扩大显露范围,通过横突、上下关节突等结构明确进钉点,增加了创伤和医源性上位椎间退变的风险。因此有必明确一个微创的L5椎弓根钉进钉点。
目的:通过影像学评价以L5乳突“斜坡”作为进钉点的L5椎弓根螺钉置入准确性。
方法:第5腰椎上关节突基底部的乳突向后突起的最高点向内下方延伸过程中形成一斜面,将其定义为乳突“斜坡”;其内侧为椎弓根部内上缘,向外比邻横突根部,位于人字嵴结构顶点的略上方,“斜坡”是椎旁肌间隙入路时可最先触及且显露的骨性部位。以乳突“斜坡”为进钉点,对50例腰椎退行性疾病患者行L5椎弓根螺钉置入内固定,根据术前CT和X射线透视确定椎弓根钉矢状面和横断面的进钉方向。椎弓根钉直径均为6.5 mm。修复过程中评价其一次性置钉成功率,置钉后行腰椎正侧位X射线片和CT检查,评价置钉准确率。
结果与结论:应用乳突“斜坡”定位法的一次性置钉成功率为96%(96/100);于L5椎体内共置入100枚椎弓根螺钉,根据Gertzbein等推荐的标准,95枚(95%)螺钉完全位于椎弓根内,5枚(5%)螺钉均向内侧穿透椎弓根皮质,其中3枚(3%)螺钉穿透距离< 2 mm,2枚(2%)螺钉穿透距离为2-4 mm,均未出现神经根损伤等并发症。提示L5乳突“斜坡”定位法的一次性置钉成功率高,结合置钉前的X射线片和CT评价可获得较高的置钉准确率。

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

关键词: 植入物, 脊柱植入物, 椎弓根螺钉, 腰椎, 内固定, 进钉点, 置钉准确性

Abstract:

BACKGROUND: In clinical application, the structure of crista lambdoidalis of L5 was unclear. It needs to expose more tissue to define L5 entry point through transverse process or superior and inferior articular process. This increased the risk of trauma and iatrogenic superior intervertebral degeneration. Therefore, it is necessary to expose L5 entry point with a minimally invasive way.  
OBJECTIVE: To investigate the accuracy of L5 pedicle screw insertion with the entry point of mastoid process slope by imaging.
METHODS: Mastoid process was located on the base of L5 superior articular process. A cant was formed when the highest point of L5 mastoid process backward protuberance extended inwards and downwards. The cant was defined as mastoid process slope; it was lateral to pedicle medial superior side internally, medial to transverse process root and superior to the top of crista lambdoidalis. The slope was first easily touched and exposed in lumbar posterior surgery through paraspinal muscle space approach. Fifty patients of lumbar spine disorders were treated by L5 pedicle screws fixation through the entry point of mastoid process slope. According to preoperative radiographic and CT images, pedicle screw insertion direction of the sagittal and transverse sections 
was calculated. The diameter of pedicle screw was 6.5 mm. The condition of intraoperative successful rate of screws placement at one time was analyzed. The accuracy of screw placement was evaluated by postoperative radiographic and CT images.
RESULTS AND CONCLUSION: With the method of the mastoid process slope, the successful rate of screw placement at one time was 96% (96/100). Totally 100 screws were inserted into L5. According to the criterion by Gertzbein, 95 screws (95%) totally located in pedicles and 5 screws (5%) encroached on the pedicle from medial wall. Three (3%) out of 5 inaccurately placed screws cut out less than 2 mm of the inner wall, while 2 (2%) between 2 mm and 4 mm, without neurologic deficits. The method of mastoid process slope had a high successful rate of screw placement. Combined with preoperative X-ray films and CT images could obtain a high accuracy rate of screw insertion.

中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Lumbar Vertebrae, Bone Nails, Internal Fixators

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