Pedicle screw adjustments affect stability of thoracolumbar burst fracture.
Pedicle screw adjustments affect stability of thoracolumbar burst fracture.
复制标题
椎弓根螺钉的调整影响胸腰椎爆裂性骨折的稳定性。
DOI：
10.1097/00007632-200111010-00008
复制
发表时间：
2001
期刊：
影响因子：
3
通讯作者：
Panjabi,MM
中科院分区：
文献类型：
--
作者：
Oda,T;Panjabi,MM
研究设计：椎弓根螺钉内固定对实验性胸腰椎爆裂性骨折的稳定作用的体外生物力学研究。目的：评价椎弓根螺钉内固定装置不同调整方式对脊柱-装置结构稳定性的影响。背景资料摘要：椎弓根螺钉装置被广泛用于完成脊柱复位，为受伤的脊柱提供稳定性。在以前的生物力学研究中，已经对许多装置的脊柱-装置结构的稳定性进行了检验。然而，还没有研究定量评估器械调整和结构稳定性之间的关系。方法：对5具L1椎体爆裂性骨折的身体标本进行研究。在T12、L2椎体上安装椎弓根螺钉固定器。研究了五种器械调整(纯压缩、纯牵张、纯伸展、牵张-伸展组合和中性姿势)。在完好时、爆裂性骨折后和每次内固定器调整后进行多向灵活性测试，以记录脊柱稳定性。结果：结构稳定性与内固定器调整有复杂的关联。例如，最大的屈曲和伸展稳定性分别是通过纯压缩和伸展-伸展组合调整来实现的。结论：器械调整对脊柱结构稳定性的影响在不同方向上有所不同。虽然单纯加压在大多数方向上提供了最大的稳定性，但考虑到神经减压，牵张-伸展联合调整可能更适合。
Study Design.An in vitro biomechanical study of the stabilizing effect of pedicle screw instrumentation on experimental thoracolumbar burst fractures.Objectives.To evaluate the effects of different adjustments applied by the pedicle screw fixation device on the stability of the spine–device construct.Summary of Background Data.Pedicle screw devices are widely used to accomplish spinal reduction and provide stability to an injured spine. In previous biomechanical studies the stability of the spine–device constructs has been examined for many devices. However, no study has quantitatively assessed the associations between the device adjustments and the stability of the construct.Methods.Five-vertebrae human cadaveric specimens with burst fracture at L1 vertebra were studied. Pedicle screw fixation device was attached to the T12 and L2 vertebrae. Five device adjustments (pure compression, pure distraction, pure extension, a combination distraction–extension, and neutral posture) were studied. Multidirectional flexibility test was performed when intact, after burst fracture, and after each device adjustment to document spinal stability.Results.The construct stability had a complex association to the device adjustment. For example, the maximum flexion and extension stabilities were achieved by pure compression and distraction–extension combination adjustments, respectively. Pure distraction and pure extension adjustments decreased the construct stability.Conclusions.The device adjustments affected the spinal construct stability differently in different directions. Although pure compression provided the most stability in most directions, the combined distraction–extension adjustment may be more suitable considering the neural decompression also.