单钉-沟槽柱翼钢板加WDFC治疗腰椎滑脱症的生物力学实验

An invitro biomechanical study of treatment for lumbar spondylolithesis using nail-grooved tail steel plate and intervertebral implant (Wendeng Fusion Cage,WDFC)

目的:采用力学实验的方法,检验单钉-沟槽柱翼钢板加WDFC(Wendeng fusion cage)对腰椎滑脱复位固定后腰骶部的稳定程度。方法:取死后1～2h内生前健康成人尸体,男9具,女3具,随机分2组,各取腰骶段(L3-S3)湿骨,制作腰椎滑脱疾病模型;采用单钉-沟槽柱翼钢板加WDFC分别制成单节段和跨节段固定试件,贴应变片。采用电测法,对每个试件分别测试2次应变值。实验获得的数据运用GRAFTOOL软件进行处理。结果:单节段与跨节段非破坏性压缩实验中相关系数、相关曲线无明显斜率变化。在单节段弯扭组合试验中试件各点应力均大致呈线性增长。在跨节段弯扭实验中,出现两侧对应点不对称斜率,失去稳定状态。结论:通过实验证明单钉-沟槽柱翼钢板加WDFC治疗腰椎滑脱复位固定后有着良好的稳定性,在各种加载过程当中,应力与应变在大于人体行走负荷状态下均呈线性分布。同时,通过弯扭实验也证明单节段固定抗扭转性较跨节段固定有更好稳定性。

Objective：To evaluate the biomechanics of treatment for lumbar spondlolisthesis using nail-grooved tail steel plate and WDFC（Wendeng Fusion Cage）implant. Methods：There were nine permanent waist-sacrum wet bone （L3-S3） in 1 to 2 clay-cold hours including 6 men and 3 wemen. They were seldom separated into 3 groups,which were fixed by nail-grooved fail plus WDFC. The model was separate into two kinds for single and across. With electrometry,deal experiment date with Graftool software. Each piece should betested twice respectively. Results：The single and across segment non-destructive compression experiment. No-mid-compression from 0 to 750 N,the related coefficient and curves had no obvious change on inclined rate. In the single segment curvedly serial experiment,the stress at all point measured by two sides steel plate was mostly linear growth. In the across segment curvedly serial experiment,the inclined rate become big and appear anisomerous. Conclusion：It＇s proved by biomechanics that the steel plates with single furrow and cylinder wing plus WDFC has a good stability to cure lumbar vertebra slips.