CAJ | 학술논문

目的观察ISOBAR TTL动态固定系统对腰椎固定节段椎间负荷的影响.方法选用6具新鲜人体腰椎标本,建立终板应力测试系统,选取L3椎体下软骨终板为测试应力部位,分别测量L3～L4运动节段软骨终板应力.L3～L4节段在椎间盘正常及摘除状态,分别进行TTL及坚强系统(SS)固定;依次使标本处于中立位、前屈、后伸、左弯、左旋,MTS858材料机施加轴向负荷,数据直接MTS机采集,由放大器放大后形成Excel文件.结果无论在椎间盘正常或摘除组,固定节段L3～L4在直立、屈曲、伸展、侧屈及旋转等各种状态,TTL、SS系统固定状态下终板应力较无固定的正常标本明显减小,差异有统计学意义(P＜0.05),各固定组间差异有统计意义(P＜0.05),SS系统坚强固定下终板应力最低,而TTL系统固定下终板应力稍高于坚强组.结论 TTL半坚强动态固定系统能够起到明显缓解腰椎固定节段椎间载荷的作用,避免对固定节段的应力遮挡.
목적 관찰ISOBAR TTL동태고정계통대요추고정절단추간부하적영향.방법 선용6구신선인체요추표본,건립종판응력측시계통,선취L3추체하연골종판위측시응력부위,분별측량L3～L4운동절단연골종판응력.L3～L4절단재추간반정상급적제상태,분별진행TTL급견강계통(SS)고정;의차사표본처우중립위、전굴、후신、좌만、좌선,MTS858재료궤시가축향부하,수거직접MTS궤채집,유방대기방대후형성Excel문건.결과 무론재추간반정상혹적제조,고정절단L3～L4재직립、굴곡、신전、측굴급선전등각충상태,TTL、SS계통고정상태하종판응력교무고정적정상표본명현감소,차이유통계학의의(P＜0.05),각고정조간차이유통계의의(P＜0.05),SS계통견강고정하종판응력최저,이TTL계통고정하종판응력초고우견강조.결론 TTL반견강동태고정계통능구기도명현완해요추고정절단추간재하적작용,피면대고정절단적응력차당.
Objective To study the effect of the ISOBAR TTL system on the fixed discal pressure.Methods Six fresh adult lumbar samples were tested.The L3-L4 segment,been studied in normal and disectomy state,was stabilized by TTL and 5 mm solid system relatively.Set up cartilage endplate stress test system,in the position of flexion 10°,extensionl0°,lateral bending10°,lateral rotation 10°,858 type MTS provided 400 N axial load,Then test and compare the stress on the endplate of the stabilized segment.Results In normal or disectomy state,the endplate stress (ES) deseased obviously after fixed by TTL and solid fixation system (SS) in every position,there existed significant variances between the fixation group and the normal group (P ＜ 0.05),so did the TTL and SS group,the ES of the SS group was the lowest,while that of TTL group was a bit higher.Conclusion TTL system can alleviate the ES of the fixed segment obviously and avoid the stress block.