摘要
目的评估一种改良骨水泥推注器在骨质疏松椎体钉道强化中的应用价值。方法选取10个新鲜老年尸体腰椎标本(L1~L5),测量椎体骨密度,均符合骨质疏松症诊断标准(T<-2.5)。将标本随机分为2组(普通推注器组和改良推注器组),每组5个椎体,各置入10枚椎弓根螺钉。采用影像学方法观察骨水泥分布情况,测量两组螺钉最大轴向拔出力(Fmax)及发生Fmax时的线性位移(LD)。结果普通推注器组骨水泥主要分布于椎体前部,改良推注器组则主要分布于椎体前部、中后部及部分椎弓根。与普通推注器组相比较,改良推注器组Fmax及LD更大(P<0.05)。结论骨质疏松椎体置钉过程中采用改良推注器进行骨水泥钉道强化,骨水泥分布更加广泛,螺钉在椎体内的生物力学稳定性更好。
Objective To evaluate the application of a modified bone cement injection device(BCID)in approach with augmented pedicle screw instrumentation in the osteoporotic vertebrae.Methods A total of 10 lumbar vertebrae harvested from elderly fresh cadavers,confirmed as osteoporosis by bone mineral density measurement(T<-2.5),were randomly divided into 2 groups(standard BCID group and modified BCID group,n=5),with 10 pedicle screws placement in each group.The distribution of bone cement was radiographically observed,and the maximum axial pullout strength(Fmax)of pedicle screws and their linear displacements(LD)when Fmax happening in two groups were measured respectively.Results Bone cement in standard BCID group was mainly distributed in the anterior part of osteoporotic vertebrae,whereas bone cement in modified BCID group was mainly distributed in the anterior,middle and posterior area of the vertebrae,as well as at the part of the pedicle.Values of Fmax and LD of pedicle screws in modified BCID group were higher than those in standard BCID group(P<0.05).Conclusion The application of modified BCID in approach with augmented pedicle screw instrumentation in osteoporotic vertebrae can effectively enhance the biomechanical stability of the screws further with more extensive distribution of bone cement.
作者
马航展
陈建莲
梁栋柱
陈永强
黄杰峰
李伟宽
MA Hangzhan;CHEN Jianlian;LIANG Dongzhu;CHEN Yongqiang;HUANG Jiefeng;LI Weikuan(Department of Spinal Surgery,Panyu Hospital of Traditional Chinese Medicine,Guangzhou,Guangdong 511400,China;不详)
出处
《中国骨科临床与基础研究杂志》
2020年第3期156-160,共5页
Chinese Orthopaedic Journal of Clinical and Basic Research
基金
广州市番禺区科技医疗卫生重点学科项目(2017-Z04-13)
广州市番禺区科技医疗卫生一般项目(2019-Z04-86)。
关键词
骨质疏松
骨黏合剂
推注器
钉道强化
生物力学
Osteoporosis
Bone cement
Injection device
Pedicle screw augmentation
Biomechanics
