Kanno Nobuo, Amimoto Hirokazu, Hara Yasushi, Harada Yasuji, Nezu Yoshinori, Yogo Takuya, Tagawa Masahiro
Division of Veterinary Surgery, Department of Veterinary Science, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino-shi, Tokyo, Japan.
Am J Vet Res. 2012 May;73(5):672-80. doi: 10.2460/ajvr.73.5.672.
To evaluate the role of the semitendinosus muscle in stabilization of the canine stifle joint.
Left stifle joints collected from cadavers of 8 healthy Beagles.
Left hind limbs, including the pelvis, were collected. To mimic the tensile force of the quadriceps, gastrocnemius, and semitendinosus muscles, wires were placed under strain between the ends of each muscle. A sensor was used to measure the tensile force in each wire. Specimens were tested in the following sequence: cranial cruciate ligament (CrCL) intact, CrCL transected, released (tensile force of semitendinosus muscle was released in the CrCL-transected stifle joint), and readjusted (tensile force of semitendinosus muscle was reapplied in the CrCL-transected stifle joint). Specimens were loaded at 65.3% of body weight, and tensile force in the wires as well as the cranial tibial displacement were measured.
Tensile force for the CrCL-transected condition increased significantly, compared with that for the CrCL-intact condition. Mean ± SD cranial tibial displacement for the CrCL-transected condition was 2.1 ± 1.3 mm, which increased to 7.2 ± 2.3 mm after release of the tensile force in the semitendinosus muscle.
Results supported the contention that the semitendinosus muscle is an agonist of the CrCL in the stifle joint of dogs. Moreover, the quadriceps and gastrocnemius muscles may be antagonists of the CrCL. These findings suggested that the risk of CrCL rupture may be increased by diseases (such as cauda equina syndrome) associated with a decrease in activity of the semitendinosus muscle.
评估半腱肌在犬膝关节稳定中的作用。
从8只健康比格犬的尸体上采集左膝关节。
采集包括骨盆的左后肢。为模拟股四头肌、腓肠肌和半腱肌的张力，在每块肌肉两端之间放置金属丝并施加应变。使用传感器测量每根金属丝中的张力。标本按以下顺序进行测试：前交叉韧带（CrCL）完整、CrCL横断、释放（在CrCL横断的膝关节中释放半腱肌的张力）和重新调整（在CrCL横断的膝关节中重新施加半腱肌的张力）。标本加载相当于体重65.3%的负荷，并测量金属丝中的张力以及胫骨前移。
与CrCL完整的情况相比，CrCL横断情况下的张力显著增加。CrCL横断情况下胫骨前移的平均值±标准差为2.1±1.3毫米，在半腱肌张力释放后增加到7.2±2.3毫米。
结果支持以下观点，即半腱肌是犬膝关节中CrCL的协同肌。此外，股四头肌和腓肠肌可能是CrCL的拮抗肌。这些发现表明，与半腱肌活动减少相关的疾病（如马尾综合征）可能会增加CrCL破裂的风险。
