Itoi E, Berglund L J, Grabowski J J, Schultz F M, Growney E S, Morrey B F, An K N
Department of Orthopedics, Mayo Clinic, Rochester, MN 55905, USA.
J Orthop Res. 1995 Jul;13(4):578-84. doi: 10.1002/jor.1100130413.
The tensile properties of the supraspinatus tendon were investigated in 11 shoulders from fresh cadavers. The tendon was divided into three longitudinal strips: anterior, middle, and posterior. Each specimen was mounted on a materials testing machine, with four fluorescent markers placed on both surfaces of the tendon strip. The positions of these markers were recorded during the test by two synchronized video cameras. Load-deformation and strain curves were determined, and the stress-strain curve, strength, and modulus of elasticity were calculated. The posterior strip was thinner in cross section than the others (p = 0.0355). The ultimate load and ultimate stress were significantly greater in the anterior strip (16.5 +/- 7.1 MPa) than in the middle (6.0 +/- 2.6 MPa) and posterior (4.1 +/- 1.3 MPa) strips (p < 0.0001). The modulus of elasticity also was significantly greater in the anterior strip (p < 0.0001), but there was no significant difference between the superficial and deep surfaces. It is concluded that the anterior portion of the supraspinatus tendon is mechanically stronger than the other portions, and it seems to perform the main functional role of the tendon.
在11个取自新鲜尸体的肩部标本上研究了冈上肌腱的拉伸特性。将肌腱纵向分为三条：前部、中部和后部。每个标本安装在材料试验机上，在肌腱条的两面放置四个荧光标记。在测试过程中，由两台同步摄像机记录这些标记的位置。测定负荷-变形和应变曲线，并计算应力-应变曲线、强度和弹性模量。后部条带的横截面比其他条带薄（p = 0.0355）。前部条带的极限负荷和极限应力（16.5 +/- 7.1 MPa）显著高于中部（6.0 +/- 2.6 MPa）和后部（4.1 +/- 1.3 MPa）条带（p < 0.0001）。前部条带的弹性模量也显著更高（p < 0.0001），但浅面和深面之间没有显著差异。得出的结论是，冈上肌腱的前部在力学上比其他部分更强，似乎发挥着肌腱的主要功能作用。
