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作 者:杜心如[1] 赵玲秀[1] 张一模[1] 叶启彬[2]
机构地区:[1]承德医学院附属医院骨科,河北承德067000 [2]北京协和医院骨科,北京100730
出 处:《中国临床解剖学杂志》2002年第2期86-88,共3页Chinese Journal of Clinical Anatomy
摘 要:目的:研究以腰椎人字嵴顶点椎弓根螺钉进钉点的解剖学基础。方法:在100套成人干燥腰椎骨标本上对人字嵴的出现率、人字嵴顶点与椎弓根中心的关系进行了观测。结果:①腰椎人字嵴出现率为94.8%。其中L1为96.7%;L2为98.9%;L3为100%;L4为99%;L5为81%;②进钉角度:L1为5.1°±4.7°;L2为6.2°±3.7°;L3为7.5°±3.2°;L4为8.9°±3.3°;L5为10.7°±7.9°。③进钉深度:L1为(4.3±0.3)cm;L2为(4.3±0.3)cm;L3为(4.5±0.4)cm;L4为(4.3±0.3)cm;L5为(4.1±0.3)cm。结论:①腰椎的人字嵴结构恒定存在,变异小,且不受退变影响;②人字嵴顶点位于或接近椎弓根中心,不需过多地显露横突和关节突关节,是一种简单、实用的进钉方法。Objective: To study the anatomical basis of regarding the A shape crest of the lumbar spine as a inserting landmark of pedicle screw. Methods: One hundred dry lumbar specimens were used for this study. Anatomical evaluation focused on the determination of the ' ∧ 'shape crest and the relationship between the top point of the crest and the lumbar pedicle center. Results: The appearance rate of the ' ∧ 'shape crest was 96.7% in L1, 98. 9% in L2 , 100% in L3, 99% in L4 and 81 % in L5 . The outward tilt angles of the screw entrancing into pedicles were as follows: 5.1°±4.7°inL1, 6.2°±3.7°in L2, 7.5°±3.2°in L3, 8.9°±3.3°in L4, and 10.7°±7.9°in L5. The entrance depth was 4.3°±0.3°cm inL1,4.3°±0.3°cm inL2,4.5°±0.4°cm in L3,4.3°±0.3°cm inL4 and 4.1 °±0.3°cm in L5. The entrance point of this method was almost in the center of the pedicles. Conclusions: The '∧' shape crest is easily exposed and identified in the operation, and it is needless to exposed the transverse process. The screw should slant obliquely outward at an angle of 5°- 10°in L1 - L4, 10°- 15°n L5 and the depth of the screw insertion was 4.0-4. 5cm in our method. The new landmark of screw entrance point appears to offer an easy way for insertion of the pedicle screw that leads to a very high success rate of screw insertion through posterior approach.
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