摘要
目的:研究脊柱椎弓根螺钉并横向牵引装置的把持力与外倾角的关系。方法:将18只成人腰椎干燥标本随机分为三组,每组6只,分别以5°、15°、30°的外倾角打入直径5.5mm的椎弓根螺钉,钉尾用横向牵引装置连接,测定把持力。结果:在5°～30°的范围内,随着外倾角的增加,椎弓根螺钉的把持力增加,但对椎体的应力也增加。结论:在应用经椎弓根螺钉内固定并加用横向牵引装置时,适当增加外倾角,可增大螺钉的把持力,提高固定强度,外倾角过大则易对椎体造成破坏。
Objective: To study the correlations of the pullout strength of pedicle screw with device for transverse traction and extraversion angle.Methods: 18 adulted human lumber vertebrae were randomly divided into 3 groups,6 lumber vertebrae for each group. pedicle screws (diameter 5.5mm)with device for transverse traction were inserted into with extraversion angle 5°,15°,30° for pullout test. Results: The pullout strength were increased when the extraversion angle were augmented from 5o to 30o. meanwhile, the vertebral stress force increased too.Conclusion: Results suggested that the pedicle screws with device for transverse traction might have better fixation effects when extraversion angle were augmented, but the increased stress force might damage vertebrae.
出处
《河北医学》
CAS
2005年第5期433-435,共3页
Hebei Medicine
关键词
外倾角
椎弓根螺钉
横向牵引装置
内固定
生物力学
把持力
Extraversion angle
Pedicle screw
Device for transverse traction
Internal fixation
Biomechanics
Pullout strength
