摘要
目的探讨钉道局部点状固化技术在体外强化椎弓根螺钉固定的效果。方法选用30个新鲜成年山羊腰椎。每一个椎体一侧椎弓根常规置钉(空白组);另一侧对钉道局部进行点状固化处理后拧入螺钉(实验组)。24h后,随机选取10个椎体行轴向拔出实验,其余20个椎体行周期抗屈实验。结果螺钉最大轴向拔出力(Fmax):空白组(637.60±109.95)N,实验组(816.50±134.88)N;螺钉拔出的能量吸收值:空白组(1.268±0.252)J,实验组(1.631±0.269)J,两组间差异均有统计学意义(P<0.05)。周期抗屈试验中,实验组的螺钉能够耐受更大的负荷或者在同等负荷下所产生的位移较小。结论钉道局部点状固化技术可以显著增加椎弓根螺钉固定的稳定性,为临床解决螺钉松动问题提供了新的研究方向,具有较好的临床应用前景。
Objective To evaluate the effect by partial solidification of track on strengthening pedicle screw fixation in vitro. Methods 30 fresh adult goat lumbar vertebrae were harvested. Usual fixation of pedicle screw was given to one side of each lumbar vertebrae (blank group),and partial solidification of track before fixation of pedicle screw was given to the other side (experiment group). 10 lumbar vertebrae were selected randomly followed by axial pullout test and periodical bending resistance test was perfor...
出处
《医用生物力学》
EI
CAS
CSCD
2008年第4期306-310,共5页
Journal of Medical Biomechanics
基金
国家高技术研究发展计划(863计划)(2007AA02Z468)
