CAJ | 학술논문

目的：评价骨水泥强化技术在钉道扩大时对椎弓根螺钉固定强度的影响，为腰椎内固定翻修选择可靠的补救技术提供依据。方法选用成人尸体腰椎标本40个，观察组进行骨水泥强化，对照组普通方法置钉，进行生物力学检测。结果两种固定方法的最大轴向拔出力及最大旋出扭矩具有显著性差异（P<0.001），并提示弱相关。结论（1）在腰椎内固定翻修手术中，对椎弓根螺钉进行骨水泥强化可以有效提高椎弓根螺钉的固定强度。（2）钉道本身的骨质量对进行强化后的椎弓根螺钉固定强度影响有限。
목적：평개골수니강화기술재정도확대시대추궁근라정고정강도적영향，위요추내고정번수선택가고적보구기술제공의거。방법선용성인시체요추표본40개，관찰조진행골수니강화，대조조보통방법치정，진행생물역학검측。결과량충고정방법적최대축향발출력급최대선출뉴구구유현저성차이（P<0.001），병제시약상관。결론（1）재요추내고정번수수술중，대추궁근라정진행골수니강화가이유효제고추궁근라정적고정강도。（2）정도본신적골질량대진행강화후적추궁근라정고정강도영향유한。
Objective To evaluate the effect of bone cement augmentation technique on fixation strength of pedicle screw dur-ing trajectory expansion,to provide the basis of reliable remedial technique selection for revision of internal lumbar fixation.Methods A total of 40 lumbar vertebrae and 80 pedicles were obtained to stimulate the trajectory of pedicle needing revision after internal lumbar fixation surgery. 40 lumbar vertebrae were randomly divided into Group A and Group B ,with 20 simple fixed sides and 20 augmented fixed sides in each group. In Group A,pedicles on both sides of all the specimens were determined for the maximum axial pullout of strength;while in Group B,pedicles on both sides of all the specimens were detected for the maximum rotary torque,and differences between the two sides were compared. Results (1) There was significant difference between the two fixations,indicating a weak correlation. Conclusion (1)It was confirmed that in revision of internal lumbar fixation,bone cement augmentation on pedicle screw can effectively improve the strength of pedicle screw. (2)Maximum axial pullout of strength and maximum rotary torque in reinforced group were weakly correlated with those in the control group ,suggesting the bone quality of the trajectory had limited influence on the strength of reinforced pedicle screw fixation.