Disc lesions and the mechanics of the intervertebral joint complex
Disc lesions and the mechanics of the intervertebral joint complex
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DOI：
10.1097/00007632-200012010-00010
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发表时间：
2000-12-01
期刊：
影响因子：
3
通讯作者：
Fazzalari, NL
中科院分区：
文献类型：
--
作者：
Thompson, RE;Pearcy, MJ;Fazzalari, NL
研究设计.分析了椎间盘撕裂与椎间关节和椎体骨力学的相关性。研究椎间盘退变对脊柱运动节段力学的影响。椎间盘退变导致尖晶石力学的变化。撕裂类型和大小对椎间关节力学的实际影响尚不清楚。将30个脊柱标本（中位年龄68岁）分为T12-L1、L2-L3和L4-L5运动节段。机械测试记录了拉伸、伸展和扭转的刚度。通过对椎间盘的三个横切面进行测绘和测量同心撕裂、放射状撕裂和边缘病变来确定椎间盘形态。然后量化每个椎间盘内每种撕裂类型的严重程度。取相邻椎体的骨块进行压缩试验，测定其弹性模量，并在纵向方向上进行破坏试验。撕裂组年龄较大，并且：骨弹性模量比无撕裂组降低。完整关节的伸展刚度随着撕裂严重程度的增加而增加。L2-L3和L4-L5的扭转刚度随着边缘病变严重程度的增加而降低。椎间盘撕裂反映在椎骨弹性模量的降低和屈曲、伸展和扭转时椎间关节力学的变化。
Study Design. Correlations between tears in the disc and the mechanics of both the intervertebral joint and vertebral body bone were analyzed.Objectives. To examine the effect of disc degeneration on the mechanics of spinal motion segments.Summary of Background Data. Degeneration of the intervertebral disc results in changes to the mechanics of the spinel The actual effect:of tear type and size on the mechanics of the intervertebral joint; is unknown.Methods. Thirty spinal specimens (median age, 68 years) were divided into T12-L1, L2-L3, and L4-L5 motion segments. Mechanical tests recorded stiffness inflexion, extension, and torsion. Disc morphology was ascertained by taking three transverse sections of the disc and mapping and measuring the concentric tears, radial tears, and rim lesions. The severity of each tear type within each disc then was quantified. Bone cubes from the adjacent vertebral bodies were tested in compression to determine the elastic moduli and tested to failure in the longitudinal direction.Results. Groups with tears were older and had: reduced bone elastic moduli than groups without tears. Extension stiffness for the intact joint tended to increase with increasing tear severity. A decrease in torsional stiffness was present with increased severity of rim-lesions at both L2-L3 and L4-L5.Conclusions. Tears in the intervertebral disc are reflected in a reduction in vertebral bone elastic modulus and in changes in the mechanics of the intervertebral joints in flexion, extension, and torsion.