Vertebroplasty versus kyphoplasty:: Biomechanical behavior under repetitive loading conditions
Vertebroplasty versus kyphoplasty:: Biomechanical behavior under repetitive loading conditions
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DOI：
10.1097/01.brs.0000231714.15876.76
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发表时间：
2006-08-15
期刊：
影响因子：
3
通讯作者：
Alamin, Todd F.
中科院分区：
文献类型：
--
作者：
Kim, Mi Jung;Lindsey, Derek P.;Alamin, Todd F.
研究设计.离体生物力学研究应用解剖尸体骨折椎体。目的：研究在重复载荷条件下，椎体成形术或椎体后凸成形术治疗的椎体骨折的行为。背景资料摘要。椎体成形术和椎体后凸成形术是治疗退行性椎体骨折的新方法。随后可能会遇到可能导致使用这些方法治疗的骨折的载荷条件;因此，重要的是要了解所得结构的生物力学行为的差异。有7对膨胀的T8和T10椎体循环加载，以产生椎体压缩骨折。每对中，一组被分配到椎体后凸成形术组，另一组被分配到椎体成形术组。处理后，将样本循环加载至100，000次循环，在预测失效载荷的20%至70%之间。椎体后凸成形术恢复了椎体高度，但在循环载荷过程中椎体高度显著降低。椎体成形术标本具有较高的压缩刚度和较小的高度减少。在重复载荷条件下，经椎体后凸成形术治疗的骨折椎体最初较高，但由于在载荷过程中高度逐渐降低，100，000次循环后所得结构比经椎体成形术治疗的结构短。
Study Design. Ex vivo biomechanical study using osteoporotic cadaveric fractured vertebral bodies.Objective. To investigate the behavior of fractured osteoporotic vertebral bodies treated with either vertebroplasty or kyphoplasty under repetitive loading conditions.Summary of Background Data. Vertebroplasty and kyphoplasty are newer alternatives for the treatment of osteoporotic vertebral fractures. Loading conditions that can lead to fractures treated with these methods will likely be encountered subsequently; as such, it is important to understand differences in the biomechanical behavior of the resultant constructs.Methods. There were 7 pairs of osteoporotic T8 and T10 vertebral bodies cyclically loaded to produce a vertebral compression fracture. Of each pair, one was assigned to the kyphoplasty group and the other to the vertebroplasty group. After treatment, specimens were cyclically loaded to 100,000 cycles, between 20% and 70% of the predicted failure load.Results. Height was restored with kyphoplasty, but the vertebral bodies showed significant height loss during cyclic loading. Vertebroplasty specimens had higher compression stiffness and smaller height reduction.Conclusions. Under repetitive loading conditions, fractured vertebral bodies treated with kyphoplasty were initially taller, but because of a progressive loss of height during loading, the resulting constructs were shorter after 100,000 cycles than those treated with vertebroplasty.