Kinematics of the lumbar spine following pedicle screw plate fixation.
Kinematics of the lumbar spine following pedicle screw plate fixation.
复制标题
椎弓根螺钉板固定后腰椎的运动学。
DOI：
10.1097/00007632-199303010-00015
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发表时间：
1993
期刊：
影响因子：
3
通讯作者：
J. Cusick
中科院分区：
文献类型：
--
作者：
N. Yoganandan;F. Pintar;D. Maiman;J. Reinartz;A. Sances;S. Larson;J. Cusick
本研究旨在确定经椎弓根螺钉和钢板内固定腰椎的运动学反应。使用了7具未防腐的人身体腰椎。在每个椎体、小关节柱和棘突的骨性标志处植入反向反射靶点。使用电液压试验装置以2.5毫米/秒的速度对试件进行准静态加载，直到失效(初始循环)。X光照相后，再次将试件加载(损伤循环)到前一循环确定的破坏压缩。然后在损伤的近端和远端的一个水平上插入双侧椎弓根螺钉。使用损伤循环中采用的程序进行稳定加载循环。对稳定和损伤的柱子之间的局部运动学数据的比较分析表明，固定节段之间的运动减少，增加了柱子的刚性。然而，在固定的近端和远端，运动增加，表明增加了灵活性。在单周负荷过程中观察到的这些运动变化，在活体中可能会进一步加剧，导致脊柱的过度活动和退化。
This investigation was conducted to determine the kinematic response of the lumbar spine instrumented with transpedicular screws and plates. Seven unembalmed human cadaveric lumbar spines were used. Retroreflective targets were inserted into the bony landmarks of each vertebral body, facet column, and spinous process. The specimen was quasistatically loaded until failure (initial cycle) using an electrohydraulic testing device at a rate of 2.5 mm/sec. After radiography, the specimen was again loaded (injury cycle) to the failure compression determined in the previous cycle. Transpedicular screws then were inserted bilaterally at one level proximal and distal to injury. The stabilized cycle of loading was conducted using the procedure adopted in the injury cycle. Comparative analysis of the localized kinematic data between the stabilized and injured columns indicated a reduction in motion between fixated levels, increasing the rigidity of the column. At levels proximal and distal to fixation, however, motion increased, indicating added flexibility. These alterations in the motion, observed during single-cycle loading, may be further accentuated in vivo, leading to hypermobility and degeneration of the spine.