Dynamic and Static Analysis of Rotator CUFF (Supraspinatus Tendon) with Tensile Test

通过拉伸测试对肩袖（冈上肌腱）进行动态和静态分析

基本信息

批准号：
02670668
负责人：
FUKUDA Hiroaki
金额：
$ 1.34万
依托单位：
Tokai University School of Medicine
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Objective : The bursal-side (B-S) and the joint-side (J-S) layers of the supraspinatus tendon may be torn in the different mechanism. In this study, we attempted to clarify the difference of the histological characteristic and the biomechanical property between both layers with reference to the etiology of the rotator cuff tear.Materials and Methods : 50 supraspinatus tendons were resected from bilateral shoulders of fresh cadavers (28-79 yrs.). Histological sections from 10 supraspinatus tendons were made in the coronal and four cross planes at the musculotendinous junction, proximal and distal points of the critical portion and the insertion. In the biomechanical study, 40 supraspinatus tendons were divided horizontally into the B-S and J-S layers of equal thickness. Quasistatic tensile test was performed foe each layer and the elongation rates in the musculotendinous, tendinous and insertional portions were measured.Results : The tendon fibers of the supraspinatus were thicker in the B-S layer than in the J-S layer. The fibers in the J-S layer tapered toward the insertion. In the tensile test, the destroying stress to the B-S layer was greater than that to the J-S layer while the elastic modulus was lower in the former. The tendinous portion had the largest elongation rate in the B-S layer, while the J-S layer elongated evenly. 'Gross rupture' occurred in the proximal portion of the tendon in the B-S layer and near the insertion in the J-S layer. 'Concealed rupture' occurred near the insertion and reflected the degenerative changes of the enthesis.

目的：冈上肌腱的滑囊侧（B-S）层和关节侧（J-S）层可能以不同的机制撕裂。在本研究中，我们试图结合肩袖撕裂的病因来阐明两层组织学特征和生物力学特性的差异。材料和方法：从新鲜尸体的双侧肩部切除50根冈上肌腱（28- 79 岁）。在肌腱交界处、关键部分和插入点的近端和远端点的冠状面和四个交叉平面中制作 10 根冈上肌腱的组织学切片。在生物力学研究中，将40根冈上肌腱水平分为等厚度的B-S层和J-S层。对各层进行准静态拉伸试验，测量肌腱部、肌腱部和插入部的伸长率。结果：冈上肌腱纤维B-S层比J-S层粗。 J-S 层中的纤维朝插入方向逐渐变细。拉伸试验中，B-S层的破坏应力大于J-S层，而B-S层的弹性模量较低。肌腱部分B-S层伸长率最大，而J-S层伸长均匀。 “严重断裂”发生在 B-S 层肌腱近端部分和 J-S 层插入点附近。 “隐性破裂”发生在插入点附近，反映了附着点的退行性变化。