LOAD-BEARING CHARACTERISTICS OF LUMBAR FACETS IN NORMAL AND SURGICALLY ALTERED SPINAL SEGMENTS
LOAD-BEARING CHARACTERISTICS OF LUMBAR FACETS IN NORMAL AND SURGICALLY ALTERED SPINAL SEGMENTS
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DOI：
10.1097/00007632-198303000-00002
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发表时间：
1983-01-01
期刊：
影响因子：
3
通讯作者：
VANDERBY, R
中科院分区：
文献类型：
--
作者：
LORENZ, M;PATWARDHAN, A;VANDERBY, R
进行了一项体外实验研究，以测量由于不同量的压缩轴向载荷而对人体腰椎小关节产生的诱导载荷。在尸检时从尸体上获得的L2-L3和L4-L5脊柱运动节段上进行测试。首先在中立位，然后在伸展位对脊柱标本施加压缩载荷。在正常状态下和左侧小关节切除后测试运动节段。使用压敏膜定量接触压力。在对运动节段施加轴向载荷之前，将该膜插入2个小关节的关节面之间。除了记录压力外，该膜还用于量化接触面积。这提供了足够的信息来计算所研究的所有情况下的总刻面载荷。本研究的结果显示了小关节面载荷、峰值压力和接触面积如何随所研究的各种载荷、位置和状态而变化。随着节段压缩载荷的增加，绝对关节面载荷显然保持相对恒定，因此，以施加到节段的载荷的百分比表示的关节面载荷随着轴向载荷的增加而减小。随着伸展载荷的增加，接触区域在L2-L3处明显向头侧移动，在L4-L5处明显向尾侧移动。在小关节切除术后，尽管峰值压力增加，但其余小关节上的负荷明显显著降低。L2-L3节段和L4-L5节段之间的小关节载荷存在显著差异。
An in vitro experimental study was carried out to measure the induced loading on human lumbar facets due to varying amounts of compressive axial load. Testing was done on L2-L3 and L4-L5 spinal motion segments obtained from cadavers at autopsy. The compressive loading was applied to the spinal specimens in 1st a neutral position and then in an extended position. The motion segments were tested in a normal state and after facetectomy of the left facet. Contact pressures were quantified using pressure-sensitive film. This film was inserted between the articulating surfaces of the 2 facet joints prior to placing axial loads on the motion segments. In addition to recording pressure, the film was also used to quantify contact area. This provided sufficient information to compute the total facet loadings for all cases studied. Results of this study show how facet loads, peak pressures and contact areas change with respect to the various loads, positions and states studied. The absolute facet loads apparently remain relatively constant with increasing segmental compressive loads such that the facet load expressed as a percent of load applied to the segment decreases with increasing axial loads. The contact area apparently moves cranially at L2-L3 and caudally at L4-L5 with increasing loads in extension. The load on the remaining facet apparently is reduced substantially after a facetectomy although peak pressure increases. The substantial difference in facet loadings between L2-L3 segments and L4-L5 segments were demonstrated.