EFFECTS OF STRESS SHIELDING ON THE MECHANICAL-PROPERTIES OF RABBIT PATELLAR TENDON
EFFECTS OF STRESS SHIELDING ON THE MECHANICAL-PROPERTIES OF RABBIT PATELLAR TENDON
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DOI：
10.1115/1.2895466
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发表时间：
1993-02-01
影响因子：
1.7
通讯作者：
KANEDA, K
中科院分区：
文献类型：
--
作者：
YAMAMOTO, N;OHNO, K;KANEDA, K
在兔膝关节上研究了应力屏蔽髌腱的力学性能。应力遮挡是通过拉伸安装在髌骨和胫骨结节之间的不锈钢丝来实现的，从而完全释放髌腱中的张力。对暴露于应力遮挡1 ~ 6周的髌腱标本进行拉伸试验。应力遮挡显著改变了髌腱的力学性能：3周后，其切线模量和拉伸强度降低至对照值的9%。横截面积增加了131%，肌腱长度减少了15%。在结构特性方面也观察到了显著的变化：例如，骨-肌腱复合体的最大载荷在3周后下降到对照值的20%。组织学研究表明，应力遮挡增加了成纤维细胞的数量，减少了纵向排列的胶原束。这些结果表明，如果没有应力施加到自体移植物的情况下，膝关节韧带的增强重建，移植物的强度显着下降。
Mechanical properties of the stress-shielded patellar tendon were studied in the rabbit knee. Stress shielding was accomplished by stretching a stainless-steel wire installed between the patella and tibial tubercle and thus, releasing the tension in the patellar tendon completely. Tensile tests were carried out on the specimens obtained from the patellar tendons which were exposed to the stress shielding for 1 to 6 weeks. The stress shielding changed the mechanical properties of the patellar tendon significantly: it decreased the tangent modulus and tensile strength to 9 percent of the control values after 3 weeks. There was a 131 percent increase in the cross-sectional area and a 15 percent decrease in the tendinous length. Remarkable changes were also observed in the structural properties: for example, the maximum load of the bone-tendon complex decreased to 20 percent of the control value after 3 weeks. Histological studies showed that the stress shielding increased the number of fibroblasts and decreased the longitudinally aligned collagen bundles. These results imply that if no stress is applied to the autograft in the case of augmentative reconstruction of the knee ligament, the graft strength decreases remarkably.